苹果 - Chlorosis
症状
Leaves develop inteveinal necrosis or necrotic blotches from midrib area on older leaves first
原因
Magnesium deficiency
Potassium deficiency perhaps produces similar symptoms, but starts at leaf margins.
苹果 - Chlorosis
症状
Symptoms appear first as chlorosis between the main veins, starting on older leaves. Then develop to interveinal necrosis or necrotic blotches along the main vein. Often leaf margin remain green.
Apple and other fruits sometimes right away develop necrosis without preceding chlorosis.
原因
Magnesium deficiency
Potassium deficiency perhaps produces similar symptoms, but starts on the leaf margins.
苹果 - Chlorosis
症状
Symptoms appear first as chlorosis between the main veins starting on older leaves. Then develop to interveinal necrosis or necrotic blotches along the main vein. Often leaf margin remain green.
Apple and other fruits somtimes right away evolve necrosis without preceding chlorosis.
原因
Magnesium deficiency
Potassium deficiency perhaps produces similar symptoms, but starts at leaf margins.
苹果 - Necrosis
症状
Symptoms appear first as chlorosis between the main veins starting on older leaves. They develop to interveinal necrosis or necrotic blotches along the main vein. Often leaf margins remain green.
Apple and other fruits sometimes evolve necrosis without preceding chlorosis.
原因
Magnesium deficiency
Potassium deficiency perhaps produces similar symptoms, but starts at leaf margins.
Magnesium deficiency使变得更糟
- Sandy soils
- Acidic soils
- Potassium rich soils
- Soils receiving high potash applications
- Cold wet periods
镁很重要
- New growth maintained green and vigorous
- Fruit number and retention increased
- Fruit size may be increased
- Yields are greater
对于镁雅苒推荐的产品是
YaraVita MAGFLO 300
Apple: 4 l/ha after petal fall. In cases of severe deficiency apply also before flowering (around pink bud stage). Water rate: 500-1,000 l/ha.
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