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This article in AJ

  1. Vol. 93 No. 6, p. 1346-1354
     
    Published: Nov, 2001


    * Corresponding author(s): cvankessel@ucdavis.edu
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doi:10.2134/agronj2001.1346

Nitrogen Dynamics and Fertilizer Use Efficiency in Rice following Straw Incorporation and Winter Flooding

  1. Alison J. Eaglea,
  2. Jeffrey A. Birda,
  3. James E. Hillb,
  4. William R. Horwatha and
  5. Chris van Kessel *b
  1. a Dep. of Land, Air, and Water Resources, Univ. of California, Davis, CA 95616
    b Dep. of Agron. and Range Sci

Abstract

Incorporation of rice (Oryza sativa L.) straw, when compared with burning, affects soil N supply by increasing N and C inputs. This study determined the effects of long-term alternative rice straw management and winter flooding on seasonal crop uptake of N, fertilizer N use efficiency (FNUE), and crop N uptake from 15 N-labeled straw. Microplots were established on two sites in California, Maxwell and Biggs, by applying 15 N-labeled fertilizer during Year 4 of a long-term rice straw management study. At the end of the year, 15 N-labeled straw was applied to assess crop uptake of straw N in the following season. Fertilizer use efficiency by 15 N dilution (FUE– 15 N) over the growing season at Maxwell and at final harvest at Biggs was significantly higher when straw was burned rather than incorporated. Fertilizer use efficiency by N difference was significantly greater than FUE– 15 N, suggesting an apparent added N interaction (ANI). Straw management did not significantly affect the uptake of residual fertilizer 15 N or of straw 15 N in the subsequent year. Winter flooding had no significant effect on measured parameters. Data indicate a decrease in FNUE with a concomitant and more significant increase in the plant available soil N following the change in straw management from burning to incorporation. Belowground 15 N pools appear to be a larger source of N for the following crop than aboveground residue.

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Copyright © 2001. American Society of AgronomyPublished in Agron. J.93:1346–1354.