Ecophysiological Traits of Field-Grown<i>Crotalaria incana</i>and C.<i>pallida</i>as Green Manure

DOI Web Site 被引用文献2件 参考文献16件
  • Uratani Aya
    Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University
  • Daimon Hiroyuki
    Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University
  • Ohe Masamichi
    Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University
  • Harada Jiro
    Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University
  • Nakayama Yuichiro
    Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University
  • Ohdan Hideki
    National Agricultural Research Center for Kyushu Okinawa Region

書誌事項

タイトル別名
  • Ecophysiological Traits of Field-Grown Crotalaria incana and C. pallida as Green Manure

説明

To evaluate the growth capacity and some chemical characteristics of two Crotalaria species, C. incana and C. pallida, used as green manure, we conducted a field experiment at Osaka, Japan. Both Crotalaria species exhibited vigorous vegetative growth, and leaf area was expanded in C. pallida and branching was promoted in C. incan. Top dry weight and nitrogen content of C. pallida were twice as high as those of C. incana at 87 and 120 days after transplanting (DAT), and the lower values in C. incana were attributed to drastic defoliation of lower leaves due to earlier anthesis from mid-July. Several indicators for rapid decomposition of the plants used as green manure, such as C/N ratio, lignin (L) content and L/N ratio at 56, 87 and 120 DAT, were significantly higher in C. pallida than in C. incana. However, these values might not be critical for nitrogen mineralization after incorporation of the materials into soil. To evaluate the qualitative traits of the two species as green manures, the materials were mixed with soil at a rate of 20 g fresh weight per pot, and seeds of wheat were sown at 10 and 30 days after mixing the green manure (DAM). The growth and nitrogen uptake of wheat grown on the soil mixed with C. pallida were inferior to those of wheat grown on the soil mixed with C. incana on both sowing dates, and the difference between the effectiveness of the two species as green manure was larger in the wheat sown on 10 DAM than on 30 DAM. The possible increase in nitrogen supply and growth inhibition by incorporation of these materials to wheat plants were discussed.

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