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建德县地处北纬39.57°,冬季极端低温曾达-8.75℃,属柑桔生产发展北缘地带,1985年秋天,本人在10月3日种下88株,10月28日种下177株枳砧温州蜜柑桔苗。种植在丘陵梯田上。1985年11月20日起,即冻害来临前,进行防冻保护,首先覆土埋掉嫁接口,用一把稻草和三条小枝做成三角棚,覆在桔苗上,在朝南方向开一口,让阳光射入。1986年2月20日除去覆盖物,挖起几株桔苗进行检查,结果10月3日种植的桔苗已经抽发出了大量短而密的须根,10月28日种植的桔苗抽出须根很少。从柑桔苗冻害情况看来,10
Jiande County is located at latitude 39.57 ° north latitude, the extreme low temperature in winter has reached -8.75 ° C, belonging to the northern margin of citrus production and development. In the autumn of 1985, I planted 88 plants on October 3 and 177 plants on October 28 Hovenia orange mandarin orange seedlings. Planted in the hilly terraces. November 20, 1985, that is, before the advent of frost damage protection, the first buried buried grafting, with a straw and three branches made of triangular shed, covered in orange seedlings, open in the south direction, so that Sunlight into. February 20, 1986 to remove the cover, dug up a few strains of orange seedlings for inspection, the results of the October 3 planted orange shoots have been pumping out a large number of short and dense fibrous roots, October 28 planted mushroom seedlings out of the very less. It appears from the citrus frost damage situation, 10