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10367. Rasmussen, P.E. and C.R. Rohde. 1991. Tillage, soil depth, and precipitation effects on wheat response to nitrogen.. Soil Sci. Soc. Amer. J. 55:121-124.
Wheat yield response was measured for ten crops in a wheat-fallow rotation, with N fertilizer rates ranging from 45-180 kg N/ha. Three tillages were used: moldboard plow, offset disk, and sweep. Grain yield varied with growing season precipitation (GSP). There was a trend towards higher yield with conventional tillage when GSP was above normal. The amount of N applied for optimum yield was >135 kg N/ha with above-normal GSP and <45 kg N/ha with below-normal GSP. Excess N decreased grain yield when GSP was near normal, but not when above or below. Applied N increased straw yield curvilinearly, with little influence of tillage or soil depth. Precise selection of the amount of N to apply each year was difficult because of the strong influence of GSP.