Return to course: Nutrient management for vegetable crops
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Nutrient management for vegetable crops
Nutrient management principles
Limiting factors
Optimum nutrient levels and the effect of pH
Nutrient interactions and deficiencies
Recommendations for vegetables
Is nitrogen a special case?
Additional Resources
Nutrient management principles
Taking representative samples
Dealing with variability
Overall sampling pre-planting
Sampling before side-dressing
Sampling after harvest
Sending samples to a laboratory
Taking representative soil samples
Nitrogen
The nitrogen cycle
Nitrogen tests
Keep it in the root zone
Nutrient Budgeting
Why prepare a nutrient budget?
Prepare a pre-planting nitrogen budget
Prepare a post-harvest nitrogen budget
Prepare a phosphorous nutrient budget
Nutrient Budgeting
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Taking representative soil samples
The main causes of variability are:
*
Temporal
Spatial
Laboratory
All the above
Temporal variation applies to when the sampling was done
*
True
False
Spatial variation refers to how much of a paddock is sampled
*
True
False
In cropping, the usual test depth for soil sampling is
*
75 mm
100 mm
150 mm
200 mm
EM maps and NDVI maps can help determine sampling areas
*
EM maps measure soil and NDVI maps measure canopy
EM maps measure canopy and NDVI maps measure soil
EM maps and NDVI maps both measure soil
EM maps and NDVI maps both measure canopy
EM maps and NDVI maps of the same crop look the same, but measure different things
*
True
False
How many cores should be taken to get a representative sample for soil testing?
*
5-10
10-15
15-20
20-30
Which of the following areas should be avoided when taking soil samples for nutrient testing?
*
Stream channels
Trough sites
Headlands
Old barn sites
High spots
Low spots
Access track areas
Which map or maps might give most helpful information about the need for side-dressing in different parts of a crop?
*
A soil map from s-map
An EM map
An NDVI map
Fertiliser applied "down the spout" at planting causes an extra complication for soil sampling
*
True
False
If banded fertiliser is on about 1/5th of a bed, how many cores should be taken in that zone?
*
All of them
None of them
About half
1 in 5
1 in 20
For which nutrient is it useful to sample the whole root depth rather than the standard depth?
*
Nitrogen
Phosphorous
Potassium
Sulphur
Molybdenum
A maize crop is better than lettuce to scavenge nitrogen from deep in the soil
*
True
False
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