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Application of Italian Ryegrass-Rice Double Cropping Systems to Evaluate the Physicochemical Properties of Soil and Yield and Quality of Rice in Paddy Field in Southern Parts of Korea

남부지역 논에서 토양의 이화학적 특성 및 벼의 생산성과 미질 향상을 위한 이탈리안 라이그라스-벼 이모작 작부체계의 적용

  • Oh, Seo Young (Paddy Crop Research Division, Department of Southern Area Crop Science, National Institute of Crop Science) ;
  • Oh, Seong Hwan (Paddy Crop Research Division, Department of Southern Area Crop Science, National Institute of Crop Science) ;
  • Seo, Jong Ho (Paddy Crop Research Division, Department of Southern Area Crop Science, National Institute of Crop Science) ;
  • Choi, Jisu (Paddy Crop Research Division, Department of Southern Area Crop Science, National Institute of Crop Science)
  • 오서영 (국립식량과학원 남부작물부 논이용작물과) ;
  • 오성환 (국립식량과학원 남부작물부 논이용작물과) ;
  • 서종호 (국립식량과학원 남부작물부 논이용작물과) ;
  • 최지수 (국립식량과학원 남부작물부 논이용작물과)
  • Received : 2021.06.25
  • Accepted : 2021.08.04
  • Published : 2021.08.31

Abstract

The physicochemical properties of soil and the yield and quality of rice (Oryza sativa L. cv. Sailmi) were assessed using Italian ryegrass (Lolium multiflorum Lam. cv. Kowinearly)-rice double cropping systems in the paddy fields at Goseong and Miryang in southern Korea. The average temperatures during the ripening period were approximately 1 ℃ higher than the optimal temperature for rice ripening and the sunshine duration was reduced by frequent rainfall. Consequently, it was slightly below the optimal conditions required for rice ripening. In the soil at Goseong, winter Italian ryegrass cropping increased the pH, electrical conductivity, and the contents of organic matter, total nitrogen (T-N), available P2O5, K, Ca, and Mg than winter fallowing. Particularly, the contents of T-N and available P2O5increased significantly. In the soil at Miryang, Italian ryegrass slightly increased the electrical conductivity and the T-N, Mg, and Na contents. Therefore, winter Italian ryegrass cropping improved the physicochemical properties of paddy soils; however, Italian ryegrass-rice double cropping slightly reduced the culm length at both Goseong and Miryang, without markedly changing the panicle length or number compared to fallow-rice cropping. Furthermore, at Goseong, Italian ryegrass-rice double cropping slightly decreased the spikelet number and milled rice yield, and increased the ripened grain rate; however, at Miryang, contrasting results were observed. In addition, fallow-rice cropping revealed no differences in the head rice or opaque rice rates. The protein content was slightly increased in Italian ryegrass-rice double cropping, without significant changes in the amylose content or Toyo value, compared to that in fallow-rice cropping. The peak and breakdown viscosities were slightly decreased. These results indicate that winter Italian ryegrass cropping might alter rice taste but may not exhibit remarkable negative effects on rice cultivation. Therefore, Italian ryegrass-rice double cropping system is recommended for paddy fields in southern Korea. Nevertheless, to increase the rice yield and quality, fertilization standards for rice cropping that consider the changes in the T-N and organic matter contents in paddy fields caused by winter Italian ryegrass cropping need to be established.

Keywords

Acknowledgement

본 연구는 농촌진흥청 어젠다사업(과제번호:PJ01380802)의 지원에 의해 이루어진 결과로 이에 감사드립니다.

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