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柑桔嫩叶重复暴露于含1～2ppm氟的大气中,其叶内氟的积累可达100～200ppm单位干重。氟积累过量出现的毒害症状为叶脉间和叶缘失绿,严重时叶缘坏死,叶小,产量下降。Leonard和Graves在佛罗里达州桔园使用石灰喷雾减少因氟而引起柑桔失绿症,获得部分成功。以硫酸锰和尿素的混合液,并以消石灰水喷至柑桔叶片,经过一个较长的干燥期,出现显著的复绿,但对树体生长和果实产量的影响却未报导。作者对位于砖窑厂附近的72株伏令夏橙果园进行消
Citrus leaves repeatedly exposed to containing 1 ~ 2ppm fluorine in the atmosphere, the leaf fluoride accumulation of up to 100 ~ 200ppm unit dry weight. Toxic symptoms of overdose of fluoride accumulation are chlorosis between leaf veins and leaf margins, necrosis of leaf margins in severe cases, and small foliage, with a decrease in yield. Leonard and Graves were partially successful in using lime spray in orange orchards in Florida to reduce chlorosis caused by fluoride. With a mixture of manganese sulfate and urea, and sprayed with hydrated lime water on citrus leaves, after a longer drying period, significant re-greening occurred, but the effects on tree growth and fruit yield were not reported. The author is located in the brick kiln plant near the 72-volt Summer Orange Orchard elimination