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在柑桔、龙眼、芒果和迟熟荔枝果实膨大期,要消耗大量的养分和水分,同时需要树体内激素的平衡才能调运足够的养分供给果实生长,如果激素比例失调,营养生长过旺,势必引起果实生长受抑制而产生落果。据专家研究,柑桔在花期和幼果期遇日平均气温大于25℃、日最高气温大于30℃的异常高温天气,往往出现异常落花落果,使柑桔产量大幅度下降。高温还会影响植株根系吸收水分,加之水分蒸发大造成水分不足导致离层形成和生长素与脱落酸的比值下降,引起严重的落花
In citrus, longan, mango and late mature litchi fruit expansion, to consume a large amount of nutrients and water, and need the balance of hormones in the tree in order to mobilize enough nutrients for fruit growth, if the hormone imbalance, vegetative growth is bound to be bound to Caused by the growth of fruit inhibition and produce fruit drop. According to expert study, citrus oranges have the highest daily average temperature of more than 25 ℃ in flowering and young fruit stage, abnormal high temperature with daily maximum temperature of more than 30 ℃. High temperature will also affect the plant roots to absorb water, combined with water evaporation caused by insufficient water leading to the formation of layers and the ratio of auxin and abscisic acid decreased, causing serious falling