Use of within-field-element-size CV for improved nutrient fertilization in crop production
First Claim
1. A method for in-season nutrient application to a crop including the steps of:
- (a) determining a maximum potential crop yield for a field;
(b) determining a nutrient response index for a field;
(c) determining a reference coefficient of variation for the nutrient response index;
(d) measuring a normalized difference vegetation index for a plot within said field;
(e) determining a coefficient of variation within said plot;
(f) determining a predicted yield for said plot;
(g) determining an attainable plot yield with added nutrient as a function of said predicted yield, said nutrient response index, and said reference coefficient of variation;
(h) determining the nutrient removal at said predicted plot yield;
(i) determining the nutrient removal at said attainable plot yield;
(j) determining the amount of additional nutrient which must be supplied to achieve said attainable plot yield; and
(k) applying said amount of nutrient to said plot.
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Abstract
A method for in-season macro and micronutrient application based on predicted yield potential, coefficient of variation, and a nutrient response index. The inventive method includes the steps of: determining a nutrient response index for a field; determining the normalized difference vegetation index (NDVI) of an area to fertilize; determining the coefficient of variation of NDVI over a plot; determining a predicted crop yield for the area without additional nutrient; determining an attainable crop yield for the area with additional nutrient; determining the nutrient requirement for the area as the difference between the nutrient removal at the attainable yield minus the nutrient removal at the predicted yield, adjusted by the efficiency of nutrient utilization in the particular crop as indicated by the coefficient of variation.
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Citations
9 Claims
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1. A method for in-season nutrient application to a crop including the steps of:
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(a) determining a maximum potential crop yield for a field; (b) determining a nutrient response index for a field; (c) determining a reference coefficient of variation for the nutrient response index; (d) measuring a normalized difference vegetation index for a plot within said field; (e) determining a coefficient of variation within said plot; (f) determining a predicted yield for said plot; (g) determining an attainable plot yield with added nutrient as a function of said predicted yield, said nutrient response index, and said reference coefficient of variation; (h) determining the nutrient removal at said predicted plot yield; (i) determining the nutrient removal at said attainable plot yield; (j) determining the amount of additional nutrient which must be supplied to achieve said attainable plot yield; and (k) applying said amount of nutrient to said plot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification