Effect of Nitrogen Fertilization Practices on Spring Wheat Yield, Protein Content

Wheat response to nitrogen fertilizer management

IPNI-2012-USA-CA34

Executive Summary. Wheat is an important commodity for California’s economy. Approximately 800,000 acres of wheat are grown every year, 75 percent of which is grown in the Southern San Joaquin Valley. Growers seek a combination of high yield and high protein content if possible to improve the profitability of wheat production. This combination can be difficult to achieve, however, especially with some of the newer, higher-yielding wheat varieties. Read more


Year of initiation:2012
Year of completion:2015
Map:

Interpretive Summary

This study is evaluating the impacts of timing and rate of N fertilizer application on optimization of wheat grain yield and protein content while reducing the potential for N losses. This 4R–related study focuses on hard and durum classes of spring wheat grown in three regions in California over several years. Growers of hard and durum wheat are paid not only for crop yield but also for grain protein content.

The primary goal of this study is to evaluate the impacts of timing and rate of N fertilizer application on wheat grain yield and protein content, while reducing the potential for N loss. The study focuses on hard and durum classes of spring wheat grown in California, and will span three years, employ two experimental approaches, and include multiple varieties and locations across California’s diverse wheat agro-ecosystems.

The goal of this study is to evaluate the timing and rate of N fertilizer application to optimize wheat grain yield and protein content, while minimizing the potential for nitrate leaching. Since high yields are often accompanied by low protein content, it can be difficult to simultaneously achieve both goals. Field research to assess the response to N fertilizer management began during 2013 in the major durum, hard red, and hard white wheat-growing regions of California.

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Updates & Reports

2012

Project Description


Project Leader

Steve Wright, UCCE Tulare County


Project Cooperators

Robert Hutmacher
Steve Orloff
Geoff Shulz
Nathan Heeringa


IPNI Staff

R. Mikkelsen


Location

Americas \ Northern America \ USA \ California


Topics

4r rate, 4r time, nutrient management, profitability, yield

wheat

Nitrogen (N)