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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Nutrient management principles
Liebig's Law of the Minimum states:
*
Nitrogen is the most limiting nutrient
Nitrogen limits yield more than water does
Yield is determined by the most limiting factor
Nutrient deficiencies can be caused by
*
a lack of an essential nutruent
soil pH level
soil compaction stopping root development
poor soil drainage
All the above
Adding extra nutrients can decrease yield and/or quality
*
True
False
Crop yield increases with added nutrients up to a point
*
True
False
For most crops, the optimum pH for nutrient uptake is about
*
4.5 – 5.5
5.5 – 6.5
6.5 – 7.5
Which nutrients are limited if soil is too acidic (pH is too low)?
*
N
P
K
S
Ca
Mg
Mn
Mo
Zn
Fe
Cu
Bo
Which nutrients are limited if soil is too alkaline (pH is too high)?
*
N
P
K
S
Ca
Mg
Mn
Mo
Zn
Fe
Cu
Bo
Which pairs of nutrients show synergistic uptake?
*
N and K
N and Mg
P and Mg
Mg and Ca
Ca and Zn
Fe and Cu
K and P
Fe and K
Which pairs of nutrients show antagonistic uptake?
*
N and K
N and Mg
Mg and Ca
Ca and Zn
Fe and Cu
K and P
Fe and K
A deficiency of which nutrients shows up first on old leaves?
*
N
P
K
S
Mg
Ca
Fe
A deficiency of which nutrients shows up first on young leaves?
*
N
P
K
S
Mg
Ca
Fe
Potential yield is a key determining factor for calculating fertiliser rates
*
True
False
The risk of nitrogen leaching increases with higher levels of nitrate in the soil
*
True
False
Plants can take up nitrogen as ammonium
*
True
False
Nitrification is the process of converting organic nitrogen to ammonium
*
True
False
Denitrification is the process of converting nitrate to ammonium
*
True
False
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