KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Influence of Nitrogen Application and Shading on the Sterile-type Cold Injury in Rice

질소시비와 차광이 벼 장해형냉해에 미치는 영향

  • Kim, Hee-Dong (Kyonggi Provincial Rural Development Administration) ;
  • Tetsuo, Satake (Hokkaido National Agricutural Experiment Station) ;
  • Kim, Young-Ho (Kyonggi Provincial Rural Development Administration) ;
  • Kim, Byeong-Hyeon (Kyonggi Provincial Rural Development Administration) ;
  • Ree, Dong-Woo (Kyonggi Provincial Rural Development Administration)
  • 김희동 (경기도농촌진흥원) ;
  • 좌죽철부 (농림수산성북해도농업시험장) ;
  • 김영호 (경기도농촌진흥원) ;
  • 김병현 (경기도농촌진흥원) ;
  • 이동우 (경기도농촌진흥원)
  • Published : 1989.09.01
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Abstract

This experiment was carried out to clarify the causes of sterility in terms of pollination characteristics for the sterile-type cold damage as influenced by amount of nitrogen application and shading conditions in rice plants. The results obtained are as follows: The number of young microspore per anther was not changed greatly by amount of nitrogen application. The number of ripened pollen grains per anther decreased according to increase in nitrogen application and shading degree, but the anther length and stigma length were not significantly affected by those factors. The number of pollen grains on stigma decreased by intense shading. The fertility decreased with increased nitrogen application and intensified shading. The elongation of auricle distance per day was less in less nitrogen application and intense shading. The internode length of the first and the second from the top were shortened with intense shading, but that of the fourth was elongated. The number of spikelet per panicle decreased with increase in shading intensity.

수도 소포자초기 내냉성의 전력환경에 따른 변동과 기구 및 생육특성을 구명코자 품종 도모유다가를 공시, 질소시용량을 pot 당 0.3g외 3수준과 영화분화기~소포자초기직전의 차광을 75%외 2단계로 한 후 소포자초기에 12$^{\circ}C$ 자연광실에서 3일간 저온처리한 후 내냉성을 검토한 결과를 요약하면 다음과 같다. 1. 소포자분화수는 질소시용량간에 차이가 없었고, 약당충실화분수는 질소시용량이 많을수록, 차광정도가 클수록 적었다. 2. 약장과 주두장은 질소시용량과 차광정도에 따라서 대차 없었다. 3. 주두위에 수분된 화분수는 차광정도가 클수록 적었다. 4. 염실율은 대조구에서는 대차 없었으나 저온처리시 질소시용량과 차광정도가 클수록 낮았다. 5. 엽이간장 신장속도는 질소시용량이 적고, 차광정도가 클수록 떨어졌다. 6. 차광정도가 클수록 상위 1, 2 절간장은 짧아졌으나 4정간장은 길어졌다. 7. 일수영화수는 차광정도가 클수록 직선적으로 감소하였다.

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