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Comprehensive Nitrogen Fertilizer Management Model for Winter Wheat 1
Author(s) -
Jackson Grant D.,
Sims James R.
Publication year - 1977
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1977.00021962006900030010x
Subject(s) - agronomy , fertilizer , yield (engineering) , environmental science , growing season , grain yield , stepwise regression , nitrogen , mathematics , biology , chemistry , statistics , materials science , organic chemistry , metallurgy
Abstract 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 NO 3 ‐N in surface 30 cm of soil, and grain yield and protein content without N fertilization. Statistically significant equations were developed for all functions except post‐harvest NO 3 ‐N when excessive N fertilizer rates were used. Growing season rainfall, pan evaporation rate, soil temperature, initial soil NO 3 ‐N, soil organic matter content, available soil water, grain yield, and grain protein content were the important variables.