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農業氣候地帶別 作物生育 有效氣溫 出現特性에 따른 벼 淡水直播 安全作期 설정
심교문,이정택,윤성호,최동향 한국농림기상학회 1999 한국농림기상학회지 Vol.1 No.1
The study was conducted to establish the safe cropping season for direct - seeding on flooded paddy by the analysis of meteorological data (1973∼1992, 20 years ) from Korea Meteorological Administration. The critical date for early seeding (CDES) at direct - seeding culture on flooded paddy was decided by the appearance date of daily mean air temperature (DMAT) of 15℃. The optimum heading date (OHD) was the first day when 22℃ of daily mean air temperature could be kept for 40 days of ripening period after heading, and the critical date of late heading for safe ripening (CDHR) was the last day when 19℃ of daily mean air temperature could be kept for 40 days after heading. The optimum seeding date (OSD) and the critical date for late seeding (CDLS) could be decided by the accumulated temperature from OHD and CDHR to the appearance dates of necessary temperatures for early, intermediate, and intermediately late maturing varieties. This results can be used for the determination of the safe cropping season of direct - seeding on flooded paddy in each agroclimatic zone. For in stance, the OSD appearance date for early maturing variety in Suwon region appeared to be May 11∼20 and the CDLS appearance date was May 31∼June 7.