Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 May 1977
Published in Agron J 69:373-377 (1977)
© 1977 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Comprehensive Nitrogen Fertilizer Management Model for Winter Wheat1

Grant D. Jackson and James R. Sims2

Systems for predicting fertilizer N rates on dryland winter wheat (Triticum aestivum L) in Montana have needed refinement for several years. The objective of this study was to develop a comprehensive N fertilizer management model for dryland winter wheat based on soil properties and climatic factors. Data for multiple regression analysis were gathered from 47 locations rep resenting 4 growing seasons. A stepwise multiple linear regression technique was used to generate equations for predicting optimum grain yield, grain protein content at optimum yield levels, N fertilizer rate needed to achieve optimum yield, post-harvest soil NO3-N in surface 30 an of soil, and grain yield and protein content without N fertilization. Statistically significant equations were developed for all functions except post-harvest NO3-N when excessive N fertilizer rates were used. Growing season rainfall, pan evaporation rate, soil temperature, initial soil NO3-N, soil organic matter content, available soil water, grain yield, and grain protein content were the important variables.

Key Words: Grain yield and protein prediction • Post-harvest soil NO3-N • Soil properties • Climatic factors • Stepwise multiple linear regression

1 Paper No. 607. Montana Agric. Exp. Stn., Bozeman, MT 59715. This work was supported, in part, by a grant from the Montana Wheat Research and Marketing Committee and by Western Regional Research Project W-111, Nitrogen in the Environment. Presented before Div. A-3, S-1, S-6, C-1 and C-2, American Society of Agronomy, 10–15 Nov. 1974 at Chicago, Ill.

2 Former graduate student and professor of soils, respectively. Present address of senior author: Montana Cooperative Service, Montana State Univ., Bozeman, MT 59715.

Received for publication May 5, 1976.




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Copyright © 1977 by the American Society of Agronomy.