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5.缺镁症及矫治葡萄缺镁时,叶绿素不能形成,叶脉保持绿色,叶肉保持淡绿色或黄白色,呈花叶现象,以后变成褐色或红褐色,叶片皱缩,枝蔓中部叶片易脱落,使中部光秃;座果率低,影响产量。轻度缺镁时,先在叶缘内侧和次级叶脉间发生小的失绿斑点。严重时,叶边缘失绿。葡萄对缺镁很敏感,但品种间差异很大,欧美杂交种易发此症,如白香蕉等。矫治方法:葡萄叶片含镁0.26～1.5％为适量,低于0.26％时应根外追施0.1％的硫酸镁溶液矫治。 6.缺铁症及矫治葡萄缺铁,新梢上的嫩叶最先表现症状,呈淡绿色或黄色,除叶脉附近有一条无界限的绿条外,几乎成为淡黄或白色。严重时,生长
Magnesium deficiency and correction of grape magnesium deficiency, the chlorophyll can not be formed, the veins remain green, the leaves remain pale green or yellowish white, showing mosaic phenomenon, after turning brown or reddish brown, leaf shrinkage, , So that the central bald; fruit set rate is low, affecting production. Mild magnesium deficiency, the first leaf margin medial and secondary veins occur between small green spots. Serious, leaf edge green. Grape is very sensitive to magnesium deficiency, but a great variety between varieties, European and American hybrids prone to this disease, such as white bananas and so on. Correction methods: Grape leaves containing magnesium 0.26 ~ 1.5% as appropriate, less than 0.26% should be root top dressing 0.1% magnesium sulfate solution. 6. Iron deficiency and iron deficiency correction, young shoots on the young leaves first symptoms, pale green or yellow, with the exception of the veins near a green border, almost pale yellow or white. Serious when growing