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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. 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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  1. 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

  2. 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

  3. 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

  4. Field site – relief and plot locations

  5. 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

  6. Rainfall and soil water content

  7. Grain yield response

  8. EONR (Economic Optimum N Rate)

  9. N rec’s as a function of yield goal?

  10. Soil water content

  11. Grain yield related to soil water content

  12. EONR related to soil water content

  13. July 01 sensor information

  14. 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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