393-20 Assessing Crop Rotational Nitrogen Use Efficiency.

Poster Number 1511

See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Nitrogen Use Efficiency and Management
Wednesday, October 24, 2012
Duke Energy Convention Center, Exhibit Hall AB, Level 1
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Amanda McClellan1, William L. Pan1, Warren A. Hammac1 and Frank Young2, (1)Crop and Soil Sciences, Washington State University, Pullman, WA
(2)USDA ARS, Pullman, WA
Poster Presentation
  • McClellan et al. 2012 rNUE.pdf (3.0 MB)
  • In annual cropping systems, nitrogen use efficiency (NUE) is typically estimated on a single crop basis.  However, this approach ignores the dynamic nature of nitrogen cycling within multi-year crop rotations featuring a diverse set of crops. Our objective is to develop a component analysis of NUE of an entire crop rotation.  This approach will also provide insight into the propensity of cropping systems to retain and recycle N within a rotation.  The rotational NUE analysis will factor in crop yields, grain and residue N, fertilizer N, N mineralization estimates, and changes in soil residual inorganic N.  The analysis will be applied to two-and three-year rotation studies in the low, intermediate, and high rainfall zones of Eastern WA.  There is evidence that fertilizer carry over contributes to overall rotational NUE. By tracking changes in soil N supply between crops, the rotational NUE will help us evaluate and adopt alternative cropping systems with the propensity to retain and recycle N within a rotation.
    See more from this Division: S04 Soil Fertility & Plant Nutrition
    See more from this Session: Nitrogen Use Efficiency and Management