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Midseason Nitrogen Fertility Management for Corn Based on Weather and Yield Prediction

^a Dep. of Soil Sci., North Dakota State Univ., Fargo, ND 58105-5638
^b USDA-CSREES-NRE, Washington, DC 20250-2210
^c Dep. of Agric. and Biosyst. Eng., North Dakota State Univ., Fargo, ND 58105-5626

View larger version (31K): [in a new window]   Fig. 1. Map of plot locations and soil types. One block of plots was expanded to show randomized N treatments. A = 0, B = 45, C = 90, D = 135, E = 180, and F = 225 kg ha–1 fertilizer N.

View larger version (40K): [in a new window]   Fig. 2. Yield vs. soil plus applied N (SA-N) regressions for observed yield (n = 18) and yield predicted midseason with the reference evapotranspiration (ETR) model for the range of SA-N values. Predicted yields not significantly different than observed yields at the 0.05 level.