Sustainable technology Archives - LandWISE - Promoting sustainable land management https://www.landwise.org.nz/category/sustainable-technology/ LandWISE promotes sustainable production through leadership, support and research. Since we began in a field in 1999, we’ve completed a range of projects helping to conserve our soils, use our water wisely and get environmental and economic benefits from new (and old) technology options. Sun, 01 Dec 2024 21:48:34 +0000 en-US hourly 1 https://wordpress.org/?v=6.7.1 https://i0.wp.com/www.landwise.org.nz/wp-content/uploads/2022/03/Landwise-logo-sm20.jpg.jpg?fit=32%2C11&ssl=1 Sustainable technology Archives - LandWISE - Promoting sustainable land management https://www.landwise.org.nz/category/sustainable-technology/ 32 32 204183287 Biodiversity at the MicroFarm https://www.landwise.org.nz/2024/11/29/biodiversity-at-the-microfarm/ Thu, 28 Nov 2024 18:40:42 +0000 https://www.landwise.org.nz/?p=2201 Earlier this year we learnt of an interesting project focusing on increasing biodiversity on vegetable farms. The aim of this joint project between A Lighter Touch, Vegetables NZ and Onions NZ is to reduce pest insects in crops by increasing the abundance of beneficial insects on vegetable farms, therefore reducing the need for insecticides. Two...

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Earlier this year we learnt of an interesting project focusing on increasing biodiversity on vegetable farms. The aim of this joint project between A Lighter Touch, Vegetables NZ and Onions NZ is to reduce pest insects in crops by increasing the abundance of beneficial insects on vegetable farms, therefore reducing the need for insecticides.

Two suggested approaches for increasing biodiversity caught our attention. Over the last six months, we have been exploring their implementation at the MicroFarm. We are enormously grateful to Olivia Prouse for supporting our biodiversity journey so far. We are also grateful to Richard Mills from Summerfruit NZ for leading the way in Hawke’s Bay, and showing us the importance of just giving something a go! We also extend our gratitude to other growers engaging in this initiative, who have been sharing their experiences.

Mobile Insectaries

Mobile insectaries (moveable pods) aim to provide a source of shelter, nectar, alternative hosts and pollen (SNAP) for beneficial insects. The concentrated areas of SNAP support natural enemies, which can aid in pest control in vegetable crops. The moveable pods can be moved in and out of crops easily during the year.

Following the detailed ‘how to’ guide provided by ALT, with additional support from Olivia Prouse for plant selection, we built four moveable pods. Each pod has native five plants, all selected to flower at different times of the year. The species selected were mainly plants that had small flowers to provide habitat to small predatory wasps and other small insects which cannot feed on large flowers like commonly grown manuka.

We have been monitoring the pods to see what is flowering each month. While there is some maintenance required for weeding and watering, all plants survived the winter and are thriving this spring. We are excited to have species like Pimelea mimosa, which is a native daphne, naturally found only on Te Mata peak, and to have two species of Muehlenbeckia, which provides a food source for NZ native copper butterfly.

Annual Flower Strips

The aim adding annual flowering strips to a farm is to enhance above ground diversity. Again, this increases the diversity of natural pest insect enemies, providing additional pest control.

At the MicroFarm, we had two specific areas that made for good candidates for annual planting strips. The first is along our driveway, an area which is normally sprayed year-round for weeds. The second is under the irrigator guide cable, another area that gets sprayed, particularly in the spring and summer when the irrigator is running.

Using the ‘how to’ guide from ALT, we have planted a variety of annual flowers in these areas to see what might be suitable. In late September, we planted nine 10 m long plots of annual flowers, each with different combinations of species planted. The rest will planted by early December. We have been monitoring what is growing and what is flowering, and are excited to see insects present and a range of different colored flowers along the driveway.

What’s next?

We continue to monitor the moveable pods and annual flowering strips. We hope that our late plantings will persist through the summer and autumn. While not formally part of our main Carbon Positive project, it is a nice supplementary demonstration. We hope to showcase the ALT guides and provide some regional information about what may be suitable to grow (annuals and perennials) here in Hawke’s Bay. Read more about our journey in the latest A Lighter Touch newsletter here!

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Earthworm eDNA at the MicroFarm https://www.landwise.org.nz/2024/11/29/earthworm-edna-at-the-microfarm/ Thu, 28 Nov 2024 18:30:53 +0000 https://www.landwise.org.nz/?p=2215 Hill Laboratories announced a new commercially available soil test for earthworm eDNA this year. The new quantitative polymerase chain reaction (qPCR) test quantifies the amount of earthworm eDNA for the New Zealand’s most common earthworm species, Aporrectodea caliginosa. The current approach to assessing earthworms is through field visual assessments, which can be labour intensive and...

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Hill Laboratories announced a new commercially available soil test for earthworm eDNA this year. The new quantitative polymerase chain reaction (qPCR) test quantifies the amount of earthworm eDNA for the New Zealand’s most common earthworm species, Aporrectodea caliginosa.

The current approach to assessing earthworms is through field visual assessments, which can be labour intensive and requires expert knowledge in identifying species. The new test provides a convenient and efficient alternative for earthworm testing.

The soil test has been calibrated for 7.5 cm soil depth in pastoral settings, rather than the 15 cm depth which is the standard depth for horticultural and arable soil tests.

We have been working with Dr Nicole Schon at AgResearch, who helped to develop the test, and Hill Laboratories to better understand how the test might be relevant within a cropping context.

This month, we completed our six-monthly Visual Soil Assessments in the Carbon Positive plots. As part of this process we sent all earthworms found to Nicole for identification, and soil samples to Hills to test for A. caliginosa eDNA. We hope that these samples will help to strengthen the understanding of the soil test taken to 15 cm depth.

Check out Alex and Nicole’s article in the latest NZ Grower magazine (pg. 48-50) for more discussion, or the Hills technical note for more details.

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September 2024 at the MicroFarm https://www.landwise.org.nz/2024/10/03/september-2024-at-the-microfarm/ Thu, 03 Oct 2024 04:25:31 +0000 https://www.landwise.org.nz/?p=2128 As they say, spring has sprung here at the MicroFarm. It has been a busy start to the 2024-2025 cropping season. With the help of McCain Foods and Mike Kettle Contracting our early peas were planted on the 3rd of September, six days after our target date. Pea Planting The Conventional treatment, which was planted...

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As they say, spring has sprung here at the MicroFarm. It has been a busy start to the 2024-2025 cropping season. With the help of McCain Foods and Mike Kettle Contracting our early peas were planted on the 3rd of September, six days after our target date.

Pea Planting

The Conventional treatment, which was planted in annual ryegrass, was sprayed out one month ahead of planting, then ploughed, disced (x2) and power harrowed in preparation for planting peas. The Hybrid treatment, which was planted in a diverse mix of mainly black oats, tillage radish and vetch, was sprayed out one month ahead of planting, with the intention of letting the cover crop rot down and peas were direct drilled. The Regenerative treatment was not be planted in peas, and instead left in a restorative phase for an extended period, whereby some of the intensity is reduced from this system.

We ran into some roadblocks in the Hybrid. As the consequence of spraying out early was that there was no evapotranspiration from the crop, so the soil was slow to dry after rain. We didn’t want to cultivate this treatment, therefore didn’t have the option to speed up drying through ‘opening’ the soil. In our ‘dry runs’ with the planter, a distinct slot was created, which would mean the soil to seed contact would not be good. It would also create a nice little home for slugs. To keep with our production plan, we delayed our planting date to get a bit more drying time, so the soil was dry enough for some tilth to be created.

Additional seed treatment

The Hybrid seed was treated with Trichoderma, based on promising trial results from Wattie’s in Canterbury. This was added to the seed, on top of the standard McCain seed treatment. The Hybrid was drilled through the standing sprayed out cover crop, so the residue was anchored, and then mulched after planting. The main concern with leaving the cover crop standing is that some of the tillage radishes had popped out of the ground. If left standing, they could be picked up by the harvester and end up at the factory.

Pūkeko as far as the eye can see

In the days after the peas started to emerge, we found the treatments overrun with pest animals – pūkeko, rabbits, sparrows and pigeons. This is perhaps to be expected, however as each plot is only 0.1ha, every plant is precious! We actively managed these pests to minimise the damage. As a result, we have seen a few more hawks around, which is hopefully deterring some of the unwanted bird life.

Soil Temperature

Soil temperature in the planting line was recorded every 15 minutes for three weeks from planting. using iButton microloggers. Soil temperature in the Conventional treatment (cultivated/bare soil) was consistently higher than the Hybrid (direct drilled/mulched).

Pea emergence

Plant emergence has been monitored since the 24th of September. Four x 1m2 quadrats are counted in each plot, each day to monitor the rate of emergence. Plants are counted when the first leaves have unfurled/flattened. The Conventional treatment population is higher and more uniform than the Hybrid, which has been slower to emerge. This is likely to be related to lower soil temperature and soil conditions at planting.

Upcoming field walk

Our next field walk will be at 1pm on the 15th of October. Come along and join the conversation! Register here!

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Lessons from two years of winter cover crops https://www.landwise.org.nz/2024/10/03/lessons-from-two-years-of-winter-cover-crops/ Thu, 03 Oct 2024 04:20:47 +0000 https://www.landwise.org.nz/?p=2138 When the Carbon Positive project began, most of the Operations Advisory Group probably thought “six years = six crops”. Certainly, the focus for the operations group has been on the summer crop(s). A lot of energy has been put into getting the operations right for each treatment. Our winter cover crops, initially thought to be just...

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When the Carbon Positive project began, most of the Operations Advisory Group probably thought “six years = six crops”. Certainly, the focus for the operations group has been on the summer crop(s). A lot of energy has been put into getting the operations right for each treatment. Our winter cover crops, initially thought to be just something that happens between cash crops, have turned out to be more important than expected. We are now seeing the project as growing twelve or thirteen crops in six years!

What to plant?

First off, what should we plant? I don’t think we have yet got our cover crop mixes quite right. This year, our hybrid and regen treatments were planted in a diverse mix of 7 species (black oats, tillage radish, vetch, buckwheat, sunflowers, crimson clover and Persian clover). This was to get lots of plant diversity over the winter.

A frost in May killed the buckwheat and sunflowers, which meant they weren’t present over the winter. We planted tillage radish as it is supposed to be the “crowbar of the soil” and will break through tillage pans. Unfortunately, our radishes knew better, hit the pan and, in some areas, popped themselves 10cm out of the ground. This is potentially an issue for both the hybrid and the regen treatments, as chunks of radish could be picked up by the harvester and end up at the factory which may be a problem for product contamination.

Additionally, the radish started to flower and was beginning to set seed, so radish if unmanaged, could have become be a new weed species for us.

In this conversation, there is the question of how much plant diversity do we need? Some of the species we are using, might be okay in a pastoral grazing scenario, but could be hard to manage in a cropping system and therefore become a weed for us. In the systems we are looking at, are we able to select fewer plants, that provide functional diversity, without adding added complexity of to the management of the cover crop?

Another consideration is disease carry over. We intentionally avoided planting tic beans this year, as they could carry unwanted diseases into the following legume crops. Tic beans may be an option ahead of other crops.

Do we graze?

One of the five regenerative principles is to integrate livestock, which we have not yet done in our Regen treatment. However we have grazed our Conventional treatment, which might seem a bit backwards. It is common for Heretaunga Plains growers to plant an annual ryegrass over the winter and graze it with lambs, so we are including sheep in our Conventional treatment.

In the last two years, we wanted to use the cover crop as a mulch on the surface for our main crop to keep the soil surface covered, another of our regenerative principles. If we have a mulch on the soil surface, we hope it will significantly reduce the need for herbicides. To do this effectively, we need to grow a lot of biomass, and therefore don’t want to have sheep or cattle grazing it. We don’t really have a long enough winter growing season to do both. This is where we find tension between some of the regen principles when applied to an annual cropping system. We might yet include livestock; however, we aren’t sure what this will look like in practice.

In addition, lambs can do considerable soil damage over the winter. The photos below show the difference between grazing for a couple of weeks in dry conditions and grazing over a wet weekend this winter.

When to terminate?

Ahead of the tomato planting last year, we had a cover crop of oats, vetch and lupins in the Regen treatment. You may remember that we planned to use a modified tomato planter, which transplants seedlings directly into a mulched cover crop, eliminating the need for both cultivation and herbicides. Just before planting, we met two problems with this plan.

The first issue was that the cover crop was still actively growing and sucking moisture out of the soil, so the soil was very dry in the regen treatment. This led to large, blocky clumps of soil forming in the top 10cm of the profile. The second issue was that the timing of maturity wasn’t right for mulching and killing the oats. In a test area of cover crop, we found the oats regrow, and we had very limited herbicide options to deal with this. It might have worked if we had waited a couple of weeks, however we were working with a factory schedule and had a planting date that wasn’t very flexible.

We want to apply lessons from that experience this year. We are already seeing low soil moisture levels and low nitrate levels in the Regen treatment. To manage the amount of biomass we have grown, and stop the flowering radish from seeding, the cover crop was mulched on the 1st of October. We expect the mulching will not kill the oats, and that we will need to manage regrowth.

How to terminate?

We planted a winter cover crop, it has grown all winter, so what next? Our Operations Advisory Group is having an ongoing discussion on how we terminate it in our Regen treatment. The initial plan was to use a roller crimper, but the consensus is that this is probably not quite the right tool for the job. We have since mulched the cover crop, but we will need another action to terminate it (oats weren’t mature enough). We have two options; we either spray out the oat regrowth or we cultivate to bury the residue.

This is an important conversation for us, as the use of glyphosate is not widely accepted by the Regenerative community. But our discussions with no-till or minimum tillage growers, and some of the Canterbury regenerative croppers, show it is an important tool for successfully reducing or eliminating cultivation. Most of the literature indicates that cultivating is the number one thing to avoid if we want to increase soil carbon, which is the main metric in this trial.

Weed management is a key consideration in beans as there are few herbicide options. If the crop is too weedy it won’t be harvested. If we cultivate, we will have to manage weeds through a suite of other herbicides that have the potential to as harmful as, or worse than glyphosate when compared using the Environmental Impact Quotient.

How do we best minimise soil disturbance? Both cultivation and herbicide use fall into the category of soil disturbance. The question for our operations group comes down to what is the ‘lesser of two evils’- glyphosate or cultivation?

More questions than answers!

A key lesson from the last two years, is that cover crops are important. We have also found that cover crop management is quite complex. There are a lot of questions we need to ask ourselves:

• What is best to plant? Does this change depending on what we grow next?

• What is the ideal way to terminate, in order to minimise soil disturbance?

• How will the timing of termination impact the planting date?

• How much diversity do we want/need?

• How do we manage the biomass grown?

• What additional equipment do we need?

• Livestock vs mulch? Cattle vs sheep?

The answers to these questions will probably change for each crop, each year depending on a whole range of factors. We have established a small separate demonstration area on site where we are playing around with different cover crop options so we can learn more each winter.

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European Covered Production https://www.landwise.org.nz/2024/08/05/european-covered-production/ Mon, 05 Aug 2024 00:15:39 +0000 https://www.landwise.org.nz/?p=2069 In this post LandWISE Project Manager Alex Dickson discusses two examples of covered horticultural production in Europe, which were explored in her recent travels to Europe. Almería – a sea of greenhouses At the bottom of Spain on the edge of the Mediterranean Sea, you’ll find Almería. Almería is a city and municipality of Andalusia,...

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In this post LandWISE Project Manager Alex Dickson discusses two examples of covered horticultural production in Europe, which were explored in her recent travels to Europe.

Almería – a sea of greenhouses

View of Almería’s sea of greenhouses from the sky

At the bottom of Spain on the edge of the Mediterranean Sea, you’ll find Almería. Almería is a city and municipality of Andalusia, and is located in the desert, receiving only 200 mm of rain per year. Despite this, the region is a hub of horticultural production, with 32,200 ha of greenhouses spread across the landscape (3.7% of the total area of the province), as well as around 30,000 of open-air production.

There are 12,500 farms with undercover production which generate more than 110,000 jobs. There are many small growers who are represented by grower co-operatives. In fact, there are enough co-operatives that secondary co-operatives exists which are ‘co-operatives of co-operatives’, for example Unica, which represents 15 co-operatives. The industry prides itself on being leaders in tech transfer to growers of all sizes, and strives for shared wealth creation, and keeping small farmers in business.

The annual turnover in the region is €4.4 billion, plus an additional €1.5 billion from the auxiliary industries including nurseries, R&D centers and suppliers (approx. €6 billion total per year). Given the region’s warm location, growers can achieve year-round production. The main crops grown are eggplants, zucchini, cucumber, tomato, pepper, melon, watermelon and lettuce. In total, 3.7 million tons of fruit and vegetables are produced each year. The first greenhouse was built in 1963 and since then has taken the province from one of the poorest in Andalusia to one of the wealthiest, now ranking above average in Spain.

In 2007 a program was started to implement biological controls in horticultural crops to produce residue free crops. In 2023, Almería had the largest area in the world using biological controls in vegetables, totaling 26,800ha.

Challenges

There are significant challenges to producing food in such an intensive way, and there has been much criticism of the region’s intensive production methods and the impact on the environment.

Water is unsurprisingly a key issue in a desert. Historically water has been extracted from groundwater, depleting underground aquifers. In recent years, desalination plants have been built to provide fresh water through reverse osmosis for both human consumption and irrigation, although water is still having to be extracted from the ground to meet demand.

Plastic use is also a challenge, with the plastic on the greenhouses being replaced by growers every 3 years, however the industry reports that 100% of the plastic is recycled.

The source of the region’s labour supply has faced criticism in recent years, in relation to the exploitation of migrant workers working in the greenhouses.

Netherlands- home of the modern glasshouse

As part of our trip, we travelled through The Netherlands, where we had the opportunity to visit Van der Harg in Bemmel. They grow and pack capsicums/bell pepper in their 8.6 ha of glasshouses. They are also experimenting with growing eggplants. The design of the Dutch glasshouse originated in Den Hague, and there are 10,000 ha of glasshouses in The Netherlands today, which largely grow bell pepper, eggplant, tomato and cucumbers.

The seedlings are grown at an independent nursery and planted into the glasshouse in November. The first fruit is harvested in February. Production lasts until October when the plants are pulled out and the greenhouse is prepared for the next crop. Interestingly, the crop is grown with few to no sprays, however the crop cannot be classified as organic as it is not grown directly in the soil. The plants are grown in ‘cultivation gutters’, where there are understory plantings which are used for pest control, and climate control.

The glasshouse is located in an Agropark, NextGarden, which allows participating growers to reduce their costs by ‘industrial symbiosis’; sharing resources and infrastructure. This includes collective power generation and a biodigester. By-products of the biodigester are captured (heat and CO2) and used by the glasshouses. There is also collective water harvesting systems that delivers clean rainwater for irrigation and processing.

Challenges

There are of course challenges to this system. The process of harvesting is labour intensive, with the labour supply coming from largely from countries like Romania. A robotic harvester has been developed, however must harvest ’27 hours a day’ to be the same cost as a human. Once they reach 24 hours, the human element of production will largely be gone.

Additionally, the strings used for training the capsicum plants are plastic. To maintain production levels they are not able to use biodegradable strings as they are not transparent enough and block too much light. The plastic string is used for just one season and is the major waste product of the system.

This system is energy intensive, particularly in heating over the winter months. However, Van der Harg are working with NextGarden Agropark to reduce or capture emissions, to power the glasshouse in a sustainable way.

Same challenges, different growing system

Regardless of growing system or location, the same conversations are happening globally, in relation to the challenges growers face. Water, energy, ethical labour supply, agrichemical use, and plastics are issues facing farmers and growers regardless of system or size.

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More questions than answers – Regenerative Ag https://www.landwise.org.nz/2024/08/05/more-questions-than-answers-regenerative-ag/ Mon, 05 Aug 2024 00:00:07 +0000 https://www.landwise.org.nz/?p=2077 LandWISE Project Manager Alex Dickson discusses some of her thoughts on Regenerative Agriculture after her trip to Europe in June. As I grapple with my own understanding of Regenerative Agriculture (RA), a trip to Europe was just the thing I needed to provide me with more questions than answers! EU Green Deal- Farm to Fork...

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LandWISE Project Manager Alex Dickson discusses some of her thoughts on Regenerative Agriculture after her trip to Europe in June.

As I grapple with my own understanding of Regenerative Agriculture (RA), a trip to Europe was just the thing I needed to provide me with more questions than answers!

  1. What are the right policy tools to support both sustainable food production and growers making a livelihood?
  2. How does RA scale to go beyond a ‘buzz word’ to have a meaningful impact on the environment?
  3. What role do large corporations play in the transition to Regen Ag?
Sugar beet research trial at Bayer’s ForwardFarm near Monheim, Germany

EU Green Deal- Farm to Fork Policy

In 2020 the European Union introduced the Farm to Fork (FTF) policy as part of the EU Green Deal. The policy aims to rethink the whole food value chain, minimise the environmental impact of food production, improve resource efficiency and enhance biodiversity.

Targets set by the FTF include:

  • 50% reduction in the use and risk of chemical pesticides by 2030
  • 50% reduction in nutrient losses, while ensuring no deterioration in soil fertility by 2030
  • 20% reduction in fertiliser use by 2030
  • 50% reduction in the sales of antimicrobials for farmed animals and aquaculture by 2030
  • 25% of total farmland to be farmed organically by 2030 (9.9% of farmed area was under organic farming in 2021).

These are ambitious targets. In response to these targets, European businesses of all sizes are having to rethink what ‘the system’ looks like in the future and how they fit into food production not only in the face of environmental policy like the FTF, but also in a changing natural environment.

“Regenerative practices are for the future, not for today”

A quote by Tony Salas (founder of Shared X, Peru) at the 2024 IFAMA Conference in a session dedicated to discussing the future Regenerative Agriculture. Shifting from conventional growing methods to regenerative methods shifts the focus from yield, to the management of a functional ecosystem with an emphasis on healthy soils.

Salas reflected on the challenges that the Organic Agricultural movement has had in scaling globally, in 2021 only about 1.6% of total agricultural land was managed organically, and in global food sales organic produce accounted for 1-2%. Such challenges include regulatory barriers, reduced yields, market and distribution challenges and lower profitability.

So what should the regenerative system approach be? How do we scale RA to improve ecosystem and soil health, AND ALSO feed a growing global population, meet increasingly stringent regulatory targets and provide farmers and growers with a good income? Three key points stood out;

  1. Focus on adopting a continuous improvement model (Plan>Do>Check>Act) at all stages of the food-value chain
  2. Develop flexible standards and avoid exclusive certification
  3. Actions must be underpinned with a focus of minimising agricultures contribution to climate change.

“From ‘producing more with less’ to ‘producing more and restoring more’.”

A comment from Kai Wirtz from Bayer, one of the worlds largest agri-chemical companies. Bayer are putting Regenerative Agriculture (RA) at the heart of their company, with a vision to restore nature, and scale regenerative agriculture. They believe that it is possible to grow more using regenerative practices. Their sustainability commitments include reducing GHG emissions per kilogram of crop by 30%, reducing the environmental impact of crop protection by 30%, and supporting 100 million smallholder farms in low and middle-income countries.

Bayer has a global footprint, and they see their portfolio of products and technologies being integrated into regenerative agricultural systems, taking a multi-crop/multi-season approach to farming. This portfolio includes biologicals, crop protection, advanced seed breeding and digital tools.

“Regenerative agriculture is not a destination but a path”

I have arrived home with more questions than answers.

Europe appears to be leaning into regenerative agriculture in a big way, in response to not only stricter environmental policy, but also in what seems to be reasonably genuine concern for the future of the planet and our collective ability to feed a growing population. Large companies (like Bayer) are positioning themselves in the market to support growers in implementing regenerative practices to suit their individual farm systems in countries around the world. We see this in platforms like the Sustainable Agricultural Initiative (SAI), who have signed on over 180 global companies, with the shared goal of transforming agricultural practice for a more sustainable future.

Back in New Zealand, I wonder if we are taking regenerative agriculture serious enough? There are many unknowns, we don’t really know how RA works in NZ farm systems (though we are trying to find out) and change is scary – I find that in our own project. However, I think we know enough to have a go, to start exploring ways of improving management practice to restore ecosystem and soil health.

How do we scale regenerative agriculture in a way that we have meaningful impact on restoring the environment? How do we access the technologies being developed overseas to support change? What does the future of market access look like if we don’t adapt? What does the future of our environment look like if we don’t start to look after our soils?

Or to put it more positively, what does the future look like if we do start to look after our soils? What are the possibilities?

Some other interesting business to explore

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Carbon Positive https://www.landwise.org.nz/2024/07/01/carbon-positive-3/ Mon, 01 Jul 2024 05:06:12 +0000 https://www.landwise.org.nz/?p=2050 June update Most of June has involved watching cover crops grow! but we also completed a series of soil measurements including visual soil assessments (VSAs) and worm counts, and we have sampled for labile soil carbon. To monitor the cover crops’ development, we have made weekly ground cover measurements since germination using the smartphone Canopeo...

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June update

Most of June has involved watching cover crops grow! but we also completed a series of soil measurements including visual soil assessments (VSAs) and worm counts, and we have sampled for labile soil carbon.

To monitor the cover crops’ development, we have made weekly ground cover measurements since germination using the smartphone Canopeo app. Canopeo allows us to track growth many times without disturbing the crop in our key measurement plots.

Original RGB photo of an area of cover crop showing oats and radish, small vetch is hard to see. Most of the sunflowers were hit by frosts.
Image after Canopeo processing converts foliage (green) to white and soil (black or brown) to black. The percentage that is white is calculated.

We saw that the annual ryegrass in the conventional treatment plots reached a high ground cover percentage faster than the mixed oats, radish, vetch, sunflower mix in the hybrid and regenerative plots which are relatively sparsely planted. By the end of June, there was less difference, and the cover crops are much taller than the ryegrass. We intend grazing the ryegrass with lambs once the soil dries out some! The mixed covers will not be grazed. We will make harvest cuts and determine the actual dry biomass in all the plots before we terminate the cover crops.

A graph of the ground cover percentage of three cover crops showing conventional (annual ryegrass) plots gained ground cover faster but by the end of June, all are similar.

We think we are starting to see changes in the VSA tests, generally in a positive direction. Three examples are shown below. But remember, one image from a test at one time of year is not enough to give statistically relevant answers!! What we do see is that annual ryegrass can give good nutty structure quite quickly. Given the different cultivation that the treatments were given before tomatoes, we are not too surprised to see some differences. The hybrid plots suffered from a rotary hoe while the soil was still wet, and the subsequent pan development remains noticeable. The soil moisture was ideal for VSA when we did these in early June, and that will have helped increase scores relative to those we did in wet soil in previous seasons.

Conventional VSA
Hybrid VSA
Regen VSA

Carbon in the soil takes many forms, including mineral/inorganic calcium carbonate, the main component of limestone. The organic carbon components are often thought of as fitting into one of two pools: the “stable” and “labile” fractions. The stable fraction, which may be protected by clay minerals or soil aggregates, or be chemically persistent, takes years to centuries to decompose and to build up so annual changes are very small. Labile carbon breaks down in days or years and is the portion of soil organic carbon that consists of soil microbial biomass carbon, dissolved organic matter, and easily oxidative organic matter. Because it can be readily decomposed by soil organisms, it is the fraction of soil organic carbon with the most rapid turnover times, and its oxidation drives the movement of CO2 between soils and atmosphere. It is an active source of nutrition and an indicator of change in the soil.

We are sampling all carbon at the beginning, middle and end of the Carbon Positive project. We are sampling for labile carbon a couple of times each year, basically in spring and autumn. We have been taking labile samples to 60cm depth, split into 0-15, 15-30, and 30-60cm bands. These are the very active root zone in the cultivated depth and the area below it, which still has significant root and micro-organism activity. As well as Hill Laboratories’ measurement of labile carbon percentage using the Hot Water Extractable Carbon method, we are determining the actual soil bulk density so we can accurately assess the tonnes of labile carbon per hectare. Hill Labs has a very informative technical note on soil carbon tests.

Soil sampling to 60cm to assess labile carbon levels. Thanks Hayden from Tipu Services for lending a hand!

We also completed the Milestone 7 report which gives a lot of information about the development and outcomes of the process tomato crops we grew with Heinz-Watties last summer. Now we are reviewing our plans for the coming season and making sure things are ready.

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Pots to Plots https://www.landwise.org.nz/2024/07/01/pots-to-plots/ Mon, 01 Jul 2024 01:51:53 +0000 https://www.landwise.org.nz/?p=2043 Microshock Weed Control Is an Effective and Energy Efficient Option in the Field This is a summary of Dan’s work published under the AgResearch led “Herbicide Resistance Management” project, of which LandWISE was a small co-funder. The full paper was published open access in the Sustainability journal, and is freely available to everybody here> Abstract:...

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Microshock Weed Control Is an Effective and Energy Efficient Option in the Field

This is a summary of Dan’s work published under the AgResearch led “Herbicide Resistance Management” project, of which LandWISE was a small co-funder. The full paper was published open access in the Sustainability journal, and is freely available to everybody here>

Abstract:

Seeking low environmental impact alternatives to chemical herbicides that can be integrated into a regenerative agriculture system, we developed and tested flat-plate electrode weeding equipment for applying ultra-low-energy electric shocks to seedlings in the field.

Better than 90% control was achieved for all species, with energy to treat 5 weeds m−2 equivalent to 15 kJ ha−1 for twincress (Lepidium didymum) and redroot (Amaranthus. powellii), and 363 kJ ha−1 (leaf contact only) and 555kJ ha−1 (plants pressed to soil) for in-ground Italian ryegrass (Lolium multiflorum), all well below our 1 MJ ha−1 target and a fraction of the energy required by any other weeding system.

We compared applications to the leaves only or to leaves pressed against the soil surface, to seedlings growing outside in the ground and to plants growing in bags filled with the same soil. No previous studies have made such direct comparisons. Our research indicated that greenhouse and in-field results are comparable, other factors remaining constant. The in-ground, outdoor treatments were as effective and efficient as our previously published in-bag, greenhouse trials. The flat-plate system that we tested supports sustainable farming by providing ultra-low-energy weed control suitable for manual, robotic, or conventional deployment without recourse to tillage or chemical herbicides.

Download the full paper here>

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Rebuilding Our Soils – Successful Conference https://www.landwise.org.nz/2024/05/22/rebuilding-our-soils-successful-conference/ Tue, 21 May 2024 22:32:10 +0000 https://www.landwise.org.nz/?p=2008 Many thanks to everybody involved in our 2024 Annual Conference! All up we had 99 registrants who heard from 23 amazing presenters and saw 9 different practical demonstrations. Our special thanks to everyone who contributed by sharing their knowledge and experiences, and to delegates for their active interaction. Thanks to Pure Catering and our hosts...

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Many thanks to everybody involved in our 2024 Annual Conference! All up we had 99 registrants who heard from 23 amazing presenters and saw 9 different practical demonstrations. Our special thanks to everyone who contributed by sharing their knowledge and experiences, and to delegates for their active interaction. Thanks to Pure Catering and our hosts at the Havelock North Function Centre and at the Centre for Land and Water which hosts our MicroFarm and the demonstrations.

Many thanks also to our conference sponsors and supporters. These organisations support us through the year as well as for the conference and we are very grateful. They are the most loyal of partners we could hope for.

Ka mau te wehi!

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Rebuilding Our Soils https://www.landwise.org.nz/2024/04/26/rebuilding-our-soils/ Fri, 26 Apr 2024 01:20:18 +0000 https://www.landwise.org.nz/?p=1837 LandWISE 2024 – Rebuilding Our Soils Havelock North – 15-16 May 2024 We are looking forward to our annual conference this week. We will report on our current work with industry, researchers and growers seeking out and trialing best ways to rebuild soil.Our invited speakers will present alternative practices and novel ideas, some perhaps fringe,...

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We are looking forward to our annual conference this week.
We will report on our current work with industry, researchers and growers
seeking out and trialing best ways to rebuild soil.
Our invited speakers will present alternative practices and novel ideas,
some perhaps fringe, but all looking to be mainstream, on a range of topics.

The key topics in 2024 are:

Carbon Positive – Regenerative Cropping
Alternative Pest Management
A year on – Cyclone impacts
Data capture to understanding
New Zealand Agritech
Novel Technologies

We welcome presenters old and new and are most excited by
the breadth and depth of knowledge they offer on many topics.
We also have a great range of practical demonstrations lined up for
viewing at the MicroFarm.

The draft programme is available now, and registrations are open.

We are delighted that Apatu Group is continuing their sponsorship
to allow secondary students free conference attendance, and that
for 2024 they have been joined by Vegetables NZ and Onions NZ
so an even larger cohort can attend.

We view this as a vital element, as such students are indeed the future of our industry,
and feedback from previous years has been very positive.

Discount for our Financial Members = pay for one day, get the other free. See you there!

Thanks to BASF Crop Protection and Hawke’s Bay Regional Council for continuing their Platinum Sponsorships. Both are long-term, loyal supporters and we are most grateful. Our other loyal supporters are also back with us, so please take time to look and give them your support in return.

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