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我县1981年玉米严重减产,平均亩产比1980年低178斤,亩减率为20％,全县共减产1868万斤。县种子公司制种地玉米,1981年平均亩产205斤,比1980年亩减104斤,减产率34％。减产的特点是千粒重下降,较常年低15.2％ 1981年≥10℃积温是3119℃,比1980年多159℃,热量不是造成减产的原因。导致如此大幅度减产的因素主要是:(1)干旱。1981年3—6月是七十年代以来旱象最严重的一年。3—5月平均降雨量比同期少5—9成;黑河水量4—5月减少2—3成.5月下旬至6月上
In 1981, Maoxian County severely reduced its production of maize. The average yield per mu was 178 kg lower than that in 1980 and the mu reduction rate was 20%. The total output of the entire county was 18.68 million kg. The corn planted by the county seed companies was an average of 205 kg mu in 1981, down 104 kg from the mu in 1980, a yield reduction of 34%. The reduction in production is characterized by a decrease in 1000-grain weight, 15.2% below normal. In 1981, the accumulated temperature of ≥10 ℃ was 3119 ℃, 159 ℃ more than in 1980, and the heat was not the reason for the decrease. The main factors leading to such a significant reduction in production are: (1) Drought. March-June 1981 is the driest year of drought in the seventies. 3-May average rainfall 5-9 months less than the same period; Black River water 4-5 months to reduce 2-3 percent.