한국작물학회지 (KOREAN JOURNAL OF CROP SCIENCE)

  • 제51권1호
  • /
  • Pages.14-25
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  • 2006
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  • 0252-9777(pISSN)
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  • 2287-8432(eISSN)
한국작물학회 (The Korean Society of Crop Science)
권호 표지

Response of Grain Yield and Milled-Rice Protein Content to Nitrogen Rates Applied at Different Growth Stages of Rice

  • Nguyen, Hung The (Faculty of Resource and Environment Management, Thai Nguyen University of Agriculture and Forestry) ;
  • Kim, Min-Ho (Department of Plant Science, College of Agriculture and Life Science, Seoul National University) ;
  • Nguyen, Lan Thi (Faculty of Agronomy, Thai Nguyen University of Agriculture and Forestry, Thai Nguyen City, Vietnam) ;
  • Lee, Byun-Woo (Department of Plant Science, College of Agriculture and Life Science, Seoul National University)
  • 발행 : 2006.03.01
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초록

Response of grain yield and milled-rice protein content to nitrogen (N) rates at various growth stages is critical for quantifying real-time and real-amount of applied N requirement for target grain yield and protein content. An experiment including 10 N rate treatments at transplanting, tillering and panicle initiation stages with four rice cultivars in 2003, 6 N treatments with two rice cultivars in 2004 and 2005 was conducted. Increase of N rates at PIS significantly increased both grain yield and milled-rice protein content but increase of N rates at tillering stage significantly increased grain yield but not milledrice protein content. Therefore, high grain yield and low milled-rice protein content would be difficult to obtain only by adjusting N rates at PIS. Internal N use efficiency (INUE) was 60.5 kg grain/kg N accumulation on an average over N treatments, cultivars, and experimental years, showing considerable reduction especially at high shoot N accumulation in the experimental year of low sunshine duration. Milled-rice protein content tended to increase almost linearly with increasing shoot N accumulation, but it revealed big variation even at the same shoot N accumulation at harvest. Milled-rice protein content decreased with increasing INUE. N accumulation in the milled rice increased at an almost constant proportion of 45.5 percent of the shoot N accumulated at harvest, showing slight decresing proportion with the increasing shoot N accumulation.

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