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油菜冻害问题是油菜生产中的一个重要问题,但过去未引起人们充分重视。1987年钟祥县及周围一些县(市)的油菜籽因冻害减产,人们才普遍认识到这个问题的严重性。1987年秋种植的油菜又受到冻害的影响,在1988年入春前后还可能受到冻害威协。为探明油菜冻害规律及其防御,我们对1987年油菜冻害进行了调查研究,并提出1988年油菜防冻建议。 一、油莱生育期中对温度条件的正常要求与异常天气的影响 油菜蕾苔期,特别是花期对温度反应最为敏感,蕾苔期要求日平均气温在10℃以上,低于10℃,推迟抽苔,当日平均气温为4.8℃,最低气温为-2.1℃时,就会出现不
Rapeseed frost damage is one of the most important problems in rapeseed production, but people did not pay enough attention in the past. In 1987, Zhongxiang County and some counties (cities) around the rapeseed production due to frost damage, people generally recognized the seriousness of the problem. The rapeseed planted in the autumn of 1987 was affected by the frost damage and was also threatened by frost damage before and after the spring of 1988. In order to find out the law of frostbite and the defensive of rapeseed, we conducted a research on the frostbite of rapeseed in 1987 and put forward the recommendation of antifreeze of rapeseed in 1988. First, the oil in the growth period of the normal requirements of temperature and abnormal weather rapeseed stage, especially the most sensitive to temperature during flowering, the requirements of the elm period average daily temperature above 10 ℃, below 10 ℃, delayed pumping Moss, the average daily temperature of 4.8 ℃, the minimum temperature of -2.1 ℃, there will be no