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Nitrogen Partitioning and Seasonal Uptake Curves for Major Crops

Nitrogen Removal Report

Nitrogen Calculator For Central Valley Crops

Created by Irfan Ainuddin, Patricia Lazicki and Daniel Geisseler*

The values calculated on this website are estimates based on literature data for N uptake. They are not recommendations. Weather conditions, management and variety selection all can affect N uptake and availability. It is therefore important to monitor the N status of the field during the season with soil or leaf analyses and to make adjustments to the fertlizer program.

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Basic Inputs: Field and Crop

B. Expected yield: Units:

C. Planting date:

D. Harvest date:

The planting date is

The harvest date is

F. Percent (%) of straw removed:

Estimated crop nitrogen (N) uptake and removal:

1. N in plant product:

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2. N in product at harvest:

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3. Total N uptake:

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4. N in residue:

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5. N removed at harvest:

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Nitrogen Uptake Curve

Irrigation

K. Irrigation system:

L. Acre inches of water applied:

M. N concentration: Units:

Soil

N. Soil type:

O. Residual soil nitrate: Units:

P. Sampling depth (inches):

Q. Soil organic matter: Units:

Potential Nitrate Leaching Risks

6. Total N uptake:

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7. Residual soil N:

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8. N applied with irrigation:

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9. In season N mineralization:

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10. Required fertilizer N
without leaching:

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11. Water application efficiency

(The values below cover the range generally observed with the selected irrigation system):

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12. N at risk of leaching:

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13. Additional N to compensate for N leached:

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