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果树主干刷上白色物质,叫“涂白”,它是保护树木安全生长的重要措施。一般来说,秋末春初,都应进行涂白保护。树叶落后,树体失去遮阴,太阳辐射及温度变化较大。气温0℃时,树皮的阳光直射面温度可达7—8℃,由于树木导热不良,树干内外涨缩不平衡,易使树干开裂。涂白后,日间反射阳光,夜间吸收热量,缩小温差,便可防止干裂。至于炎热的夏天,涂白还可防止失水过多,避免灼害。此外,涂白时加少量药剂,还可
Fruit tree trunk brush white material, called “Tu white”, it is an important measure to protect the safe growth of trees. In general, late autumn and early spring, should be painted white protection. Leaves behind, trees lose shade, solar radiation and temperature changes. Temperature 0 ℃, the bark of the sun’s direct surface temperature up to 7-8 ℃, due to poor thermal conductivity of trees, unbalanced expansion and contraction of the trunk inside and outside, easy to crack the trunk. Tu white, the daytime reflection of sunlight, absorb heat at night, reduce the temperature difference, can prevent dry crack. As for the hot summer, Tu Bai also prevent excessive water loss, to avoid burning. In addition, when coated with a small amount of white medicine, but also