一、水稻秋封对产量的影响水稻出穗结实期间,阴雨低温来临,形成大量空秕现象,在汉中地区叫“秋封”。汉中地区30年中发生“秋封”的年份有1952、56、58、60、68、72、74、76年,79年“秋封”也较早,但受害很轻,共计九年,约3—4年一遇。“秋封”发生年份一般较上年减产近一成或更多,受灾面积一般占稻田面积五分之一。解放以后,汉中地区水稻单产呈线性关系逐步增加。由图看出,以 First, the impact of rice autumn seal on the yield Rice ears out during the strong, rainy cold temperatures, the formation of a large number of empty 秕 phenomenon, called the “Autumn Seal” in Hanzhong area. The years of “Qiu Feng” occurred in the middle of Hanzhong in the past 19 years were 1952, 56, 58, 60, 68, 72, 74, 76 and 79. Qiu Feng was also earlier, 3-4 years experience. The year of “Autumn Seal” generally decreased by nearly 10% or more over the previous year, and the affected area generally accounted for one-fifth of the paddy field. After the liberation, rice yield in Hanzhong area showed a linear increase. As seen from the figure,