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上海属柑桔种植北缘地区,低温出现的频率多、时间长、强度大。本县自六十年代后期开始种植柑桔以来,曾多次遇到冻害,但由于各地种植户不断地采用抗寒栽培与防冻措施,已在多处栽植成功,种植面积仍在不断地扩大,今年在发展新果园的同时,柑桔面积又增加了30％。幼桔的营养生长旺,生长期长,组织柔嫩,且树体矮小接近地面处于逆温冷层之内,容易遭受冻害。1985—1986年度冬季,上海地区遇到1978年以来未有的低温干旱,为了摸清低温对幼桔的冻害,找出有效的防冻措施,减少因冻害所造成的损失,我们对县内新种植的约100万株幼
Shanghai is a northern region of citrus cultivation, the frequency of cold appeared more, a long time, intensity. Since the beginning of the citrus cultivation in the late 1960s, the county has repeatedly encountered frost damage. However, due to the continual adoption of cold-resistant cultivation and antifreeze measures by growers all over the country, planting has succeeded in many places and the planted area is still expanding. This year, while developing new orchards, the area of citrus increased another 30%. Young orange vegetative growth, long growth period, tissue tender, and the tree is short and close to the ground in the cold temperature within the cold, susceptible to frost damage. In the winter of 1985-1986, the Shanghai area encountered unprecedented low temperature and drought since 1978. In order to find out the frost damage of juvenile orange at low temperature and find effective antifreeze measures to reduce the losses caused by frost damage, About 1 million young plants