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United States Department of Agriculture (USDA) 2007

NITROGEN MANAGEMENT TO OPTIMIZE DRYLAND CROP YIELD AND QUALITY

Nitrogen Crop Dryland

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : NITROGEN MANAGEMENT TO OPTIMIZE DRYLAND CROP YIELD AND QUALITY

Identification : WNP00579

Pays : Etats Unis

Durée : Jul 1, 2007 à Jun 30, 2012

Mots clés : nitrogen efficiency yield economics wheat hard red hard white kentucky bluegrass urea ammonia volatilization

Partenaire : WASHINGTON STATE UNIVERSITY 240 FRENCH ADMINISTRATION BLDG PULLMAN,WA 99164-0001

Objectifs
The goal of this project is to identify improved nutrient management practices for the dryland crop production in eastern Washington State. The objectives are to : 1) assess wheat market class responses to environment and nitrogen supply ; 2) evaluate fertilizer source, placement and timing effects on wheat yield, grain protein content, and nitrogen use efficiency ; 3) determine the short- and long-term effects of organic materials on soil nitrogen supply and wheat yield and grain protein content ; 4) and assess the potential for ammonia volatilization and relative effectiveness of urea-based alternatives to ammonium nitrate in dryland Kentucky bluegrass seed production systems

Descriptif
These studies will employ traditional and innovative soil fertility techniques to assess the impact and interactions of environment and nitrogen management practices on dryland wheat and Kentucky bluegrass seed crop performance. To achieve these ends, nitrogen rate by market class factorial trials will be conducted with spring and winter wheat at multiple locations. Soil nitrogen and crop performance (yield, test weight, grain protein content, and nitrogen use efficiency) will be measured, and data used to develop and update fertilizer recommendations based on desired end-use goals and the economic climate of fertilizer and crop prices. In addition, these trials will also be sampled to determine relationships between flag leaf nitrogen and grain protein. Select treatments involving split fall-spring applications of nitrogen for spring and winter wheat, foliar nitrogen applications for spring wheat, and controlled release and organic fertilizer sources, will also be included to address these questions. For grass seed production, urea-based alternatives to ammonium nitrate will be evaluated in the laboratory and at various locations with different application timing regimes to assess the influence of environmental and field conditions (moisture content, pH, burned vs. residue retained, etc.) on ammonia volatilization, seed yields and nitrogen uptake by dryland Kentucky bluegrass. This research is expected to improve the performance and profitability of dryland wheat and grass seed crops in the Pacific Northwest. Important economic-based management decisions will result from this work, potentially leading to more profitable nitrogen use and reduced environmental impact from nitrogen loss in the area

Présentation : USDA

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