KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effect of Growth and Yield of Soybean on Late-Sowing Compared to Optimal Sowing in the Southern Region of South Korea

남부지역에서 콩의 적기파종 대비 후기 파종이 생육과 수량에 미치는 영향

  • Ye Rin Kim (Department of Applied Life Science, Gyeongsang National University) ;
  • Jong hyuk Kim (Department of Applied Life Science, Gyeongsang National University) ;
  • Il Rae Rho (Department of Agronomy, Gyeongsang National University)
  • 김예린 (경상국립대학교 응용생명과학부) ;
  • 김종혁 (경상국립대학교 응용생명과학부) ;
  • 노일래 (경상국립대학교 농학과)
  • Received : 2024.02.14
  • Accepted : 2024.02.26
  • Published : 2024.03.01
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Abstract

Considering the threats of climate change, this study was conducted to investigate the influence of temperature and day-length on soybean growth and yield when sown late in comparison to the optimal sowing time in the southern region of the Korean Peninsula. Sowing was executed in 10-day intervals, including on July 1, 10, 20 and 30 and August 10, considering that the optimum sowing time of the three soybean varieties with different ecotypes is June 20. Emergence rates did not differ significantly between late-sowing and optimal sowing in all ecotypes; however, the number of days to emergence, flowering, and maturity was smaller after late sowing. A multiple-regression approach was used to test the effect of temperature and day length on the number of growing days after late sowing compared to the optimal sowing time. This analysis revealed that the number of days required from sowing to flowering was positively correlated with both day length and temperature, and the number of days from flowering to harvest was positively correlated with day length and negatively with temperature. A multiple regression equation can be calculated as follows: the number of days required from sowing to flowering (Y) = 3.177 + (0.030 × (sum of day length + sum of temperature)), and the number of days required from flowering to maturity (Y) = 20.945 + (0.021 × (sum of day length + sum of temperature)). Multiple growth parameters were significantly correlated with yield components, depending on growing days. Optimal sowing resulted in the best yield, while later sowing decreased yield compared to optimal sowing. To avoid a significant decrease in yield, early-maturing species should be sown by July 20, while late-maturing species should be sown by July 10.

남부지방(진주)에서 콩 생태형에 따라 적기파종 이후 파종 시기를 달리하였을 때 온도와 일장이 생육일수 및 수량에 미치는 영향을 조사한 결과는 다음과 같다. 1. 적기파종 이후 파종시기를 달리하여 파종하였을 때 모든 생태형에서 출현일, 개화소요일수, 전체 생육일수는 단축되었다. 2. 일장과 온도가 생육일수에 미치는 영향을 다중회귀분석으로 분석한 결과 파종~개화기까지 소요일수는 일장과 온도 모두 정의 상관이였고, 개화기~수확기까지 소요일수는 일장은 정의 상관, 온도는 부의 상관이 있었다. 3. 추정 회귀모형은 파종~개화까지 소요일수(Y) = 3.177 + (0.030 × (누적일장 + 적산온도)), 개화기~수확기까지 소요일수는 (Y) = 20.945 + (0.021 × (누적일장+적산온도))인 것으로 나타났다. 4. 수량은 적기파종에서 가장 높았고 적기파종 이후 늦게 파종할수록 수량이 급격히 감소하여 조생종은 7월 20일, 중만생종은 7월 10일 이전까지는 파종을 해야 급격한 수량감소를 피할 수 있을 것으로 보인다.

Keywords

Acknowledgement

이 논문은 농촌진흥청 공동연구사업(과제번호:PJ015705022022)의 지원을 받았으며, 이에 감사합니다.

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