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水稻大田群体晒田时期在距拔节期20d左右的6月中旬分蘖高峰期,气象因子初步分析,6月15日左右日平均气温在22℃以上为晒田始期临界点,以晒田至复水期(各处理均晒田7d)时段内平均积温166.5±4.48℃,日均23.8±0.61℃达到分蘖高峰期,其中以晒田前期是增加有效分蘖,提高分蘖成穗率的关键时段;适宜晒田的茎蘖数以达到17万~18万株/666.7m~2开始晒田;秧苗移栽大田至返青期,群体茎蘖数出现平均减蘖30%左右,以此权衡适宜移栽基本苗数。
Rice field group Shaotian period at about 20d from the jointing stage tillering peak in mid-June, the initial analysis of meteorological factors, around June 15 average daily temperature above 22 ℃ is the critical point of sun-shading start to Sha Tin to rehydration The average accumulative temperature was 166.5 ± 4.48 ℃ and the average daily average temperature was 23.8 ± 0.61 ℃ during tillering stage (all treatments were in Shatian field for 7d), and the tiller peak was reached at the early stage of shading. Field tiller number to reach 170,000 ~ 180,000 / 666.7m ~ 2 began to Shatian; seedling transplanting field to green, the average number of tillers tiller 30%, in order to weigh the appropriate transplanting basic seedlings number.