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

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


Variability in corn response to n fertilizer along a 1000 ft hillslope

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


Variability in corn response to n fertilizer along a 1000 ft hillslope

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


Variability in corn response to n fertilizer along a 1000 ft hillslope

Field site – relief and plot locations


Variability in corn response to n fertilizer along a 1000 ft hillslope

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


Variability in corn response to n fertilizer along a 1000 ft hillslope

Rainfall and soil water content


Variability in corn response to n fertilizer along a 1000 ft hillslope

Grain yield response


Variability in corn response to n fertilizer along a 1000 ft hillslope

EONR (Economic Optimum N Rate)


Variability in corn response to n fertilizer along a 1000 ft hillslope

N rec’s as a function of yield goal?


Variability in corn response to n fertilizer along a 1000 ft hillslope

Soil water content


Variability in corn response to n fertilizer along a 1000 ft hillslope

Grain yield related to soil water content


Variability in corn response to n fertilizer along a 1000 ft hillslope

EONR related to soil water content


Variability in corn response to n fertilizer along a 1000 ft hillslope

July 01 sensor information


Variability in corn response to n fertilizer along a 1000 ft hillslope

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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