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我县位于北纬33.40度,东经119.20度,年平均温度11.40℃,年降雨量1,000毫米左右,主要集中在7、8、9三个月,常遇秋旱。冬季干冷,低温出现频繁,最低温度-15—-17℃,致使油菜越冬受冻害,一般年份废弃面积达40%左右,最高年份达70%以上。近几年由于推广了一些防冻保苗措施,使废弃面积减少到7.78%。一、冻害死苗原因分析(一)菜苗素质据中国农业
My county is located 33.80 degrees north latitude, 119.20 degrees east longitude, the annual average temperature of 11.40 ℃, the annual rainfall of about 1,000 mm, mainly in the 7,8,9 three months, often encounter autumn drought. Cold and dry in winter, low temperature occurs frequently, the lowest temperature of -15--17 ℃, resulting in rape overwinter frost damage, the general year discarded area of about 40%, the highest year of more than 70%. In recent years due to the promotion of a number of frost-proof seedling measures, the waste area reduced to 7.78%. First, frozen dead seedlings reason (a) the quality of vegetables according to China’s agriculture