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Nitrogen Balance and Biological Nitrogen Fixation of Soybean in Soybean-Barley Cropping System

Park Sei Joon    (National Institute of Crop Science, RDA   ); Kim Wook Han    (National Institute of Crop Science, RDA   ); Lee Jae Eun    (National Institute of Crop Science, RDA   ); Kwon Young Up    (National Institute of Crop Science, RDA   ); Shin Jin Chul    (National Institute of Crop Science, RDA   ); Ryu Yong Hwan    (National Institute of Crop Science, RDA   ); Seong Rak Chun    (Department of Crop Science, College of Life and Environmental Science, Korea University  );
  • 초록

    This experiment was conducted to investigate the soil nitrogen credit of biological nitrogen fixation (BNF) and the nitrogen balance of soybean in soybean-barley cropping systems. Soybean cultivar, Shinpaldalkong2 and barley cultivar, Olbori, were used in soybean mono-cropping (SM), barley monocropping (BM), and barley­soybean double cropping system. The barley-soybean double cropping system was treated with two different levels of nitrogen fertilizers, 0 nitrogen fertilizer (BS-F0), and standard nitrogen fertilizer (BS-F1). Nitrogen and organic matter concentrations in soil of BS-F1 plot on October, 2001 were increased $4.8\%\;and\;5.9\%$ , respectively, compared with those on October, 2000. The ranges of BNF rate in soybean were $69.1\~ 88.2\%$ in two years, and the rate was the highest in BS-F0 plot and the lowest in SM plot. The ranges of nitrogen harvest index (NHI) in all treatments were $83.9\~86.7\%$ . The yield was 270 kg/10a in BS­F1 plot and 215 kg/10a in BS-F0 plot. However, the nitrogen balances were +0.6 kg/10a of gain of soil nitrogen in BS-F0 plot and -0.4 kg/10a of loss of soil nitrogen in BS-F1 plot. In comparisons of SM and BS-F1 plots, although the seed yields were similar in two plots, the loss of soil nitrogen was higher in SM than BS-F1 plot. Overall, our results suggest that barley-soybean double cropping system was more effective in respect to seed productivity and soil nitrogen conservation than soybean monocropping system, and the N credit to following crops by soybean cultivation was identified in soybean double cropping system.


  • 주제어

    soybean .   biological nitrogen fixation .   nitrogen harvest index .   nitrogen balance .   barley .   cropping system.  

  • 참고문헌 (13)

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