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1978年3月1日凌晨,嘉兴地区东部几个县的最低气温骤然降到零下3—4℃,使正值拔节孕穗的大小麦遭受了严重的冻害。据统计,全区大小麦受冻害的面积达57.3万亩,占大小麦总面积的38.5%。其中大麦早熟3号冻害更为严重,一般幼穗死亡率达30—40%,严重的达60—70%。像这样严重的冻害,在嘉兴地区大小麦生产史上是罕见的。为了了解这次冻害的特点,对麦苗的影响以及灾后的补救措施,我们于3月上中旬作了调查和观察,现将所得资料整理如下。一、1978年3月1日的低温特点和大小麦冻害实况(一)低温特点:根据嘉兴县气象站资料,1978年3月1日前后的气温变化特点,是一个“高——低——高”的短促突变过程,持续时间短,温
In the early hours of March 1, 1978, the minimum temperature in several counties in the eastern part of Jiaxing suddenly dropped to minus 3-4 ° C, causing serious frost damage to large and small wheat bearing positive values at jointing booting. According to statistics, the size of wheat in the whole region is 573,000 mu, accounting for 38.5% of the total area of wheat and wheat. The frost damage of barley precocious No.3 was more serious, and the mortality rate of common panicle was 30-40% and the severity reached 60-70%. Such a serious frost damage, in the history of wheat production in Jiaxing is rare. In order to understand the characteristics of the frost damage, the impact on the wheat seedlings and the remedial measures after the disaster, we conducted a survey and observation in mid-March. The data obtained are now compiled as follows. First, the low temperature characteristics of March 1, 1978 and wheat and wheat malformation live (a) low temperature characteristics: According to the Jiaxing Meteorological Station data, March 1, 1978 changes in temperature before and after the characteristics of a “high - low - High ”short mutation process, short duration, warm