1. Citrus calcium deficiency symptoms
The upper leaves of the spring shoots are yellow or yellowish at the upper leaf edge; yellow and yellow are near the main and lateral veins and leaf margins; the main and lateral veins and the nearby leaf are still green; afterwards, the yellowing part is enlarged and the leaf surface is enlarged Yellowing, and produce dead spots, diseased leaves are narrow and small, and soon fall off; physiological fruiting is serious, the tip of branches shoots dead, and the shoots from the lateral buds will soon die; the diseased fruit is often small and deformed, pale green, juice cells Shrinking; less roots, weak growth, brown, and finally rot.
2. Causes of calcium deficiency in citrus
Acidic soils have low calcium content and are prone to calcium deficiency. Acid soils or citrus groves with large amounts of acid fertilizers are used. Due to leaching, exchangeable salt-based calcium ions are often lost, especially in citrus groves on slopes. Loss of calcium often occurs; excessive application of ammonia nitrogen fertilizer, or soil potassium, magnesium, zinc, boron content, and soil drought, will affect the absorption and utilization of calcium, induced calcium deficiency disease.
3. Citrus calcium deficiency correction method
Apply lime to the soil with calcium fertilizer, then plow; or add some lime and organic fertilizer evenly when digging holes (ditch) with organic fertilizer, and fill in the root zone. Mild calcium-deficient orchards, the application rate of 35-50 kilograms per acre.
Soil application contains calcium, phosphorus, superphosphate calcium, calcium magnesium phosphate, phosphate rock meal and bone meal and other phosphorus fertilizer calcium, applied in densely rooted areas.
Foliar fertilization During the new leaf development period, the leaves were sprayed with 0.3% calcium dihydrogen phosphate or 0.3%-0.5% calcium nitrate. Due to the large amount of calcium needed, if there are obvious symptoms of calcium deficiency, continuous spraying 3-5 times will have a significant effect.
4. Citrus calcium excess disease
Symptoms: When there is too much calcium in the soil, the soil is alkaline, so that manganese, iron, zinc, boron and other nutrients can not be absorbed and used by the tree. It is easy to induce the deficiency of these elements.
Prevention methods: in the alkaline soil should be applied physiological acidic fertilizer, reduce soil pH, reduce the absorption of calcium; alkaline soil should regularly apply manganese, iron, zinc, boron and other trace elements, generally better to spray the foliage, To prevent the deficiency of these trace elements caused by too much calcium in the soil.
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