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Abstract
Relationships between N fertilizer and soil tests on plant N uptake and content and grain protein are important for predicting crop quality and the efficiency of applied N. The objective was to quantify the effect of N soil tests, N fertilizer and placement on N uptake, N content and grain protein of small grains under no‐till conditions. Data for multiple regression analysis were collected from no‐till, winter and spring wheat and spring barley N fertilizer experiments conducted in northcentral and central Montana, 1986–1991. Dependent variables were regressed against the independent variables of organic matter, nitrate‐N, fertilizer‐N, grain yield, and interactions between nitrate‐N, fertilizer‐N and organic matter in both linear and quadratic models. Highly significant equations for most measured plant N characteristics and dependent variables were computed. Nitrate and fertilizer‐N were significant independent variables in all equations. Organic matter was added for predicting protein in barley, and the N rate x nitrate‐N interaction, and grain yield was added to spring wheat and barley protein equations. There was no difference between N applied below the seed or on the surface with any of the dependent variables.
Notes
Contribution No. J‐2690 from the Montana Agric. Exp. Stn., Bozeman, MT. This research was funded in part by the Tennessee Valley Authority (contract No. TV‐3964A), Potash and Phosphate Institute, and the Montana Wheat and Barley Committee.