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栽植在高 pH(7.9—8.2)土壤上的甜橙植株,易出现缺铁黄化花叶症状,其主要表现为秋梢叶片呈网状失绿,即叶脉保持绿色,叶肉失绿逐渐呈黄绿色、绿黄色、黄色以至黄白色,终至脱落。缺铁树减产或无产,果实变小,至9月呈柠檬黄色,完全丧失商品价值。据叶片分析结果表明:正常绿叶含铁量为42—75ppm,而黄化花叶的含铁量为21.3—27.5ppm,前者为后者含铁量的1.5—3.5倍。叶片中的含铁量与其他一些元素之间,呈现一定的相助或拮抗作用。初步看出,钾钙比值>0.5时,出现潜在缺铁;钾钙比值>1时,则呈现不同程度的黄化花叶。
Sweet orange plants planted in the soil with high pH (7.9-8.2) were prone to the symptoms of iron-deficiency yellow mosaic. The main symptoms of the plant were reticular chlorosis, that is, the veins remained green, chlorotic green gradually turned yellow-green, Green yellow, yellow and yellow-white, finally off. Iron deficiency tree cut or no production, the fruit becomes smaller, to lemon yellow in September, completely lost the value of the commodity. According to leaf analysis results show that: the normal green leaf iron content of 42-75ppm, yellow leaf mosaic iron content of 21.3-27.5ppm, the former for the latter iron content of 1.5-3.5 times. Leaf iron content and some other elements, showing a certain help or antagonism. The results showed that there was a potential iron deficit when the ratio of potassium to calcium was> 0.5. When the ratio of potassium to calcium was> 1, the yellowing mosaic flowers showed different degrees.