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钙是各种作物的生长发育所必需的十六种元素之一。而土壤中钙素的丰缺,不仅直接影响果树的发育,同时,也对果品质量起着至关重要的作用,且不同果树在缺钙后,其表现出的症状亦不同。桃树缺钙后,中后期叶片中叶脉两侧出现枯斑,或叶尖部向上卷曲干枯。桃果表现的症状有四种。1)顶腐病:果实顶部变
Calcium is one of the sixteen elements necessary for the growth and development of various crops. The abundance and deficiency of calcium in the soil not only directly affect the development of fruit trees, but also play an important role in the quality of fruit. Different fruit trees show different symptoms after calcium deficiency. After the peach tree is lack of calcium, there are withered spots on both sides of the leaf veins in the middle and late leaves, or the leaf tips curl upward and dry. Peach fruit symptoms appear in four. 1) top rot: the top of the fruit change