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我县处于亚热带季风区,是一个地形复杂,气候差异大的丘陵山区。双季稻受有效生长季节和生育特性的限制,表现出“两短一早”(全生育期短、营养生长期短和幼穗分化早)的特点,品种布局,关系着良种增产内在因素的发挥,是双季平衡增产的关键。社溪、油石等公社,多年来早稻以中熟品种为主来安排早晚两季品种,挖掘了中熟品种的增产潜力,发挥了杂交水稻的增产优势,连年双季稳产高产,但有些社队对中熟品种为主的品种布局,在认识上不够一致,早稻迟熟品种安排比例偏大,影响了晚稻良种增产内在因素的发挥,不利双季平衡增产。现将我们调查的情况和意见综述如下。
My county is in the subtropical monsoon region, is a complex terrain, large climatic differences in hilly areas. The double cropping rice is limited by the effective growing season and fertility characteristics, and shows the characteristics of “short and early morning” (short full growth period, short vegetative growth period and early panicle differentiation), and the variety layout is related to the internal factors of seed yield increase , Is the key to a balanced increase in double season. Social Creek, Whetstone and other communes, over the years early rice to medium maturing varieties to arrange the morning and evening varieties, tap the potential yield of medium-maturing varieties, give play to the yield advantage of hybrid rice, successive double-season stable and high yield, but some commune The varieties of medium maturity varieties of the layout is not consistent in the understanding of early maturing varieties of late rice varieties is too large, affecting late rice yield factors inherent in play, adverse double-season balanced production. Now we survey the situation and comments are summarized below.