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一九七六年是低温冷害严重的一年,也是海城县有气象资料的二十八年以来积温最低的一年。这一年在作物生育的四至九月间,各月的平均气温均比历年低1～2度,比高温的一九七五年低2～3度。气温稳定通过0℃的日期是三月二十五日,比一九七五年晚14天,比历年晚了天。四至九月份日平均气温大于或等于10℃的活动积温只有3128.0℃,比一九七五年和历年同期分别少482.8℃和312.1℃,甚至比积温很低的一九六九年的同期还低180.6℃。无霜期只有148天,比一九七五年少41天,比历年少9天。见表1。海城县高粱种植面积每年都在五十万亩左右,对粮食总产量有举足轻重的影响。一九七
In 1976, it was a serious year with low-temperature chills. It was also the year with the lowest accumulated temperature in twenty-eight years since there was meteorological data in Haicheng County. During the year from April to September, the average temperature of each month in crop production was 1-2 degrees lower than in previous years and 2-3 degrees lower than that in high temperature in 1975. The temperature was stable at 0 ° C on March 25 and 14 days later than in 1975, which was later than the calendar year. From April to September, the daily accumulated temperature at or above 10 ° C was only 3128.0 ° C, 482.8 ° C and 312.1 ° C lower than in 1975 and the same period of the previous year, respectively, even lower than the same period of very low accumulated temperature in 1969 180.6 ° C. Frost-free period is only 148 days, 41 days less than in 1975, 9 days less than the calendar year. See Table 1. The planting area of sorghum in Haicheng County is about 500,000 mu every year, which has a decisive influence on the total grain output. One nine seven