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1.适时早收防霜冻我县5～9月≥10℃积温平均为2796.9℃,初霜期80%的概率出现在9月23日以后。我县玉米制种田近几年多制四单8、四单10和改良铁单4等中晚熟玉米种子,如收获时间过晚,一旦遇到早霜、低温年种子就可能受到冻害,造成制种不成种,使种子芽率降低。查其原因就是收获时间过晚,造成制种不成种,根据我县9月份气温变化及几年来的实
1. Prevent frost in time as early as possible 5 ~ September in our county ≥ 10 ℃ The average temperature of 2796.9 ℃, the initial frost 80% probability appears after September 23. In recent years, the county corn farming more than four single 8, four single 10 and improved iron single 4 and other late-maturing corn seeds, such as harvesting too late, once the early frost, low temperature seeds may be frost damage, resulting in seed production Not species, so that the rate of seed germination. Check the reason is the harvest time is too late, resulting in seed production is not species, according to my county in September temperature changes and the past few years