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发表于 2008-6-16 08:59
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回复 #590 rainbow~ 的帖子
这是国外资料中关于铁线莲黄叶病的介绍和防治方法：
Yellow leaves
Clematis fed heavily on high-potash fertilizers tend to suffer from magnesium deficiency, which causes yellowing of leaves, particularly between the veins, early in the growing season. To control this disorder, apply magnesium sulphate (Epsom salts) directly to the soil at the rate of 25 grams per square meter (1 oz.per 10 sq.ft.),or dissolve 210 grams of salt in 10 litres (2.5 oz.per gallon) and spray the leaves. Add a wetting agent such as liquid soap when making up the spray.
（摘自《An Illustrates Encyclopedia of Clematis》 P90-91）
译文：
铁线莲施用过量的高钾肥料是会导致镁缺乏症，这种症状主要表现为在生长季节的早期，叶片出现黄化，特别是在叶脉之间。解决这种镁缺乏症的主要办法是在土壤中直接施用硫酸镁25克/平方米,或者将210克硫酸镁溶解在10升水中，制成0.25%的溶液进行页面喷施。喷施时可以添加一些湿润剂诸如液体肥皂等。 |
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狗仔卡
发表于 2008-6-14 22:20
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