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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © . .