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在墨西哥温暖地区采用低温需求量少的苹果品种“安娜”,使其苹果生产得到了很大发展。“安娜”苹果的叶片不能自行脱落,发芽晚且不整齐。因此必须进行化学去叶。喷布1.5%的碘化钾,可使全部叶片迅速脱落,萌芽整齐且早;碘化钾浓度为3%时对枝条有伤害。采用5%尿素喷布,也能促进落叶,但较缓慢而萌芽略整齐;用10%浓度时,落叶较迅速,萌芽整齐且较早。喷布5%硫酸铜不能使叶片完全脱落,而且萌芽也晚;用10%浓度时则叶片全部脱落,萌
In the warmer regions of Mexico, “Anna”, an apple variety with low temperature demand, has made its apple production greatly developed. “Anna” apple leaves can not fall off, sprouting late and irregular. Therefore must be chemical de-leafing. Spraying 1.5% of potassium iodide, all leaves can quickly fall off, germination neat and early; potassium iodide concentration of 3% of the branches hurt. Using 5% urea spray, but also to promote deciduous, but more slowly and sprouting slightly neat; with 10% concentration, deciduous more quickly, buds neat and earlier. Spraying 5% copper sulfate can not make the leaves completely fall off, and the sprouting is also late; when the concentration is 10%, the leaves all fall off, adorable