Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Unusual Delay of Heading Date in the 2022 Rice Growth and Yield Monitoring Experiment

2022년도 벼 작황시험에서 관찰된 출수기 지연 현상 보고

  • HyeonSeok, Lee (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion) ;
  • WoonHa, Hwang (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion) ;
  • SeoYeong, Yang (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion) ;
  • Yeongseo, Song (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion) ;
  • WooJin, Im (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion) ;
  • HoeJeong, Jeong (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion) ;
  • ChungGen, Lee (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion) ;
  • HyeongJoo, Lee (Food crop research center, Jeollanamdo Agricultural Research & Extension Services) ;
  • JongTae, Jeong (Grain Research Division, Chungcheongnam-do Agricultural Research & Extension Services) ;
  • JongHee, Shin (Grain Research Division, Gyeongsangbuk-do Agricultural Research & Extension Services) ;
  • MyoungGoo, Choi (Division of Crop Physiology and Production, National Institute of Crop Science, Rural development Administrarion)
  • 이현석 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 황운하 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 양서영 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 송영서 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 임우진 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 정회정 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 이충근 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 이형주 (전라남도농업기술원 식량작물연구소) ;
  • 정종태 (충청남도농업기술원 작물연구과) ;
  • 신종희 (경상북도농업기술원 작물연구과) ;
  • 최명구 (농촌진흥청 국립식량과학원 작물재배생리과)
  • Received : 2022.11.04
  • Accepted : 2022.12.27
  • Published : 2022.12.30
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Abstract

It is likely that the heading would occur early when air temperature increases. In 2022, however, the heading date was delayed unusually, e.g., by 3 to 5 days although temperature during the vegetative growth stage was higher than normal years. The objective of this study was to identify the cause of such event analyzing weather variables including average temperature, sunshine hours, and day-length for each growth stage. The observation data were collected for medium-late maturing varieties, which has been grown at crop yield experiment sites including Daegu, Andong, and Yesan. The difference in heading date was compared between growing seasons in 2021 and 2022 because crop management options, e.g., the cultivars and cultivation methods, were identical at those sites during the study period. It appeared that the heading date was delayed due to the difference in temperature responsiveness under a given day-length condition The effect of the temperature increase on the heading date differed between the periods during which when the day-length was more than 14.3 hours before and after the summer-solstice.. The effect of the temperature decrease during the period from which the day-length decreased to less than 14.3 hours to the heading date was relatively greater. This merits further studies to examine the response of rice to the temperature change under different day-length and sunshine duration in terms of heading.

최근 기후변화에 따른 이상기상의 증대는 안정적인 벼 생산에 위협을 주고 있으며, 출수기의 변동은 기후 변화 적응에 주요한 요인 중 하나이다. 2022년도에는 이앙부터 출수까지의 생육기간 동안 평균기온이 증가하였음에도 출수기가 5일 이상 지연되는 등의 특이적인 결과를 보였으며, 일반적인 생육단계별로 온도가 출수에 미치는 반응을 고려해 결과를 해석할 수 없었다. 이는 생육단계에 따른 온도의 반응이 다를 수 있어 벼의 출수기 변동을 정확하게 판단하는 것에 한계가 있을 것으로 생각되었으며 또한 일장조건별로 출수 반응에 미치는 온도의 영향이 달라질 수 있기 때문에 이를 구명하는 연구가 필요할 것으로 보인다. 또한 생육단계별로 일사량, 일조시간 등 일사 조건에 따른 생육 발달 변화가 출수 반응에 미치는 영향에 대한 연구가 미흡한 상황으로 이에 대한 연구가 필요할 것으로 생각된다.

Keywords

Acknowledgement

본 논문은 농촌진흥청 연구사업(세부과제명: 벼 지역별 생육 및 수량 관측 DB 구축을 위한 작황조사시험 및 작황진단 시험, 세부과제번호: PJ01582001)의 지원에 의해 이루어진 결과의 일부입니다. 연구사업 수행에 협조해 주신 모든 분들에게 감사드립니다

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