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In spring, water-spotted spots appeared between the veins of the lower or middle leaves of the old branches, gradually expanding into round and oblong blocky maculas. The spots on the back of the leaves were brown, and the diseased leaves curved toward the leaves to form cups.
When the molybdenum is severely deficient, the diseased leaves become thin, and the spots turn yellow-brown and necrotic, often appearing to be perforated, and the leaf margin is scorched.
During the onset of fruit enlargement from June to September, it began to turn yellow from the tip of the leaf, and the new leaf rolled to the front and became a tube. Severe lack of molybdenum was like nitrogen deficiency, and the leaves were heavily yellowed and fell and cracked.
2. Reasons for the lack of molybdenum in citrus
In strong acid soils, molybdenum is combined with iron and aluminum to form ferric molybdate and aluminum molybdate, which can not be absorbed; phosphorus deficiency or excessive sulfuric acid in the soil, molybdenum can not be easily absorbed; molybdenum deficiency is prone to occur; for molybdenum Demand is small and molybdenum deficiency symptoms generally do not occur.
3. Methods for correcting molybdenum deficiency in citrus
Normal molybdenum content in leaves and fruits is less than one in a million. The quick and effective treatment is to spray a 0.2%-0.3% ammonium molybdate once, cure it within one month, and spray it once a year. At the same time, the application of organic fertilizer can also correct the lack of molybdenum.
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Citrus deficient molybdenum prevention and treatment
1. Citrus lack of molybdenum