Return to course: Nutrient management for vegetable crops
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Course Overview
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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Nutrient Budgeting
'Nutrient Management for Vegetable Crops in New Zealand' uses Available N (Potentially Available N) to determine crop nitrogen requirements.
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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?
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5kg P/ha
10kg P/ha
25kg P/ha
What information is required in order to create a pre-planting nutrient budget for nitrogen?
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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?
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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?
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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?
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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?
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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?
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Decreased fruit yield
Increased fruit yield
Prolonged flowering (more young fruit)
Better crop maturity
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