Variability in Corn Response to N Fertilizer along a 1000-ft Hillslope
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Variability in Corn Response to N Fertilizer along a 1000-ft Hillslope. John Schmidt Nan Hong Adam Dellinger Doug Beegle Henry Lin ARS Missouri Penn State. Background. Improving N recommendations for corn Spatial variability in relief, aspect, soil water content

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Variability in Corn Response to N Fertilizer along a 1000-ft Hillslope

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Variability in Corn Response to N Fertilizer along a 1000-ft Hillslope

John Schmidt

Nan Hong

Adam Dellinger

Doug Beegle

Henry Lin

ARS

Missouri

Penn State


Background

Improving N recommendations for corn

Spatial variability in relief, aspect, soil water content

Fox observed a relationship in PA between EONR and July precipitation


Field site - 2005

1000 ft horizontal, 30 ft vertical relief

Previous crop soybean

Soil pH: 5.3 – 5.7

Soil P (M3): 24 – 77

Soil K (M3): 97 – 156


Field site – relief and plot locations


Treatment design

Ten locations, 2 blocks each

Six N treatments: 0, 50, 100, 150, 200, 250 lb N / acre, applied at planting as NH4NO3

TDR access tubes at each location

Soil water content, 5 June – 2 Sept, 0 – 90 cm depth

Canopy reflectance, Crop Circle ACS-210

Grain yield at harvest


Rainfall and soil water content


Grain yield response


EONR (Economic Optimum N Rate)


N rec’s as a function of yield goal?


Soil water content


Grain yield related to soil water content


EONR related to soil water content


July 01 sensor information


Summary

EONR increased linearly with an increase in soil profile water content, 25 July – 30 June

EONR was not correlated to NDVI ratio

NDVI 01 July decreased linearly with increasing soil profile water content on 30 June


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