Nutrient Budgeting

'Nutrient Management for Vegetable Crops in New Zealand' uses Available N (Potentially Available N) to determine crop nitrogen requirements. *

True

False

In order to raise Olsen P one unit (i.e., from 25 to 26), on average how much additional phosphorus is required per hectare for a sedimentary soil? *

5kg P/ha

10kg P/ha

25kg P/ha

What information is required in order to create a pre-planting nutrient budget for nitrogen? *

Soil nitrogen (kg N/ha)

Residue nitrogen (kg N/ha)

Expected yield (T/ha)

Planned fertiliser N application (kg N/ha)

Olsen P (ug/mL)

What information is required in order to create a post-harvest nutrient budget for nitrogen? *

Actual yield (T/ha)

% N in yield

Residue nitrogen at harvest (kg N/ha)

Soil nitrogen at harvest (kg N/ha)

Actual fertiliser applied

Previous crop residue nitrogen (kg N/ha)

Soil nitrogen at planting (kg N/ha)

What information is required to create a phosphorus budget? *

Soil Olsen P

Expected yield (T/ha)

Estimated phosphorus required (kg P/ha) from 'Nutrient Management for Vegetable Crops in NZ'

Planned fertiliser P applied (kg P/ha)

Soil Total P

% P in crop exported/removed

Using the 'Nutrient Management for Vegetable Crops in NZ' book, how much nitrogen would be required to grow 120 T/ha tomato crop if the Potentially Available Nitrogen is 60kg N/ha? *

50kg N/ha

70kg N/ha

20kg N/ha

0kg N/ha

Using the 'Nutrient Management for Vegetable Crops in NZ' book, how much phosphorus would be required to grow 120 T/ha tomato crop if the Soil Olsen P is 35ug/mL? *

190kg P/ha

90kg P/ha

20kg P/ha

0kg P/ha

In the example of growing a tomato crop, what are some of the impacts of applying too much nitrogen? *

Decreased fruit yield

Increased fruit yield

Prolonged flowering (more young fruit)

Better crop maturity

Nutrient management for vegetable crops

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