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淮北地区小麦、油菜越冬期间,常常发生冻害。从常年大面积生产情况看,凡是冬季寒流低温来得早,或春季低温霜冻来得迟,遭受冻害也就越严重。据调查,冻害的轻重还与下列因素有关。1.品种。小麦冬性品种受冻很轻,半冬性品种稍重,春性品种更重。甘蓝型油菜冻害轻,白菜型油菜冻害较重。2.播期。据冻害后的考查,半冬性品种泗阳936小麦,9月24日播种,主茎幼穗冻死39%,9月底播种的,幼穗冻死13%,10月5日播种的,只是部分叶片受冻。3.栽培。冻害也与当时的栽培条件有关。整地
Huaibei wheat, rape over the winter, often occurs frost damage. From the perennial large-scale production situation, all winter cold flow comes earlier, or frost in the spring to delay later, suffer the more serious frost damage. According to the survey, the severity of frost damage is also related to the following factors. Variety Winter winter wheat varieties are very cold, slightly heavier semi-winter varieties, spring varieties heavier. Cabbage rape cold damage, cabbage-type rapeseed heavier. Sowing date According to the test after frost damage, half winter wheat Siyang 936, seeding on September 24, the main stem frost death 39%, sowing at the end of September, young frost 13%, sowing on October 5, but Some leaves are frozen. 3. Cultivation. Frozen damage also related to the conditions of cultivation at the time. Site preparation