When the citrus is deficient in zinc, as the new shoot leaves begin to mature, yellow spots appear between the veins, and gradually develop rib-like bright yellow patches. When zinc deficiency is severe, the citrus top branches are slender, the internodes are shortened, the leaves are clustered, and the erects are narrow and small, and then the twigs die dry. Specific measures Citric acid can be applied by soil application, spraying and integration of water and fertilizer. If zinc deficiency is serious, it can be combined with soil application and spraying or water and fertilizer integration.
In the case of soil application, zinc ZnSO4·H2O1~1.5 kg of zinc sulfate is generally applied per mu, mixed with organic fertilizer and applied in autumn. When spraying, the concentration is preferably 0.2% to 0.3%, and can be sprayed with 1% urea solution or other water-soluble foliar fertilizer, drought-resistant anti-reverse preparation, pesticide, etc., respectively, in the spring shoot period and The autumn season is carried out.
Or in the spring shoot period, zinc sulphate (about ZnSO4·H2O1~1.5 kg per mu) is dissolved in the irrigation water, and the water and fertilizer are integrated through the irrigation pipe to realize the integrated application of water and fertilizer. Zinc fertilizer can be mixed with nitrogen fertilizer and potassium fertilizer, but it can only be mixed with acidic phosphate fertilizer (such as superphosphate, urea phosphate, etc.).
Improving the soil acidity of citrus orchards is conducive to improving the utilization rate of zinc fertilizer. The orchard with soil pH less than 5.5 applies 60-80 kg of lime or dolomite powder per acre, 50% in autumn, 50% in summer, and zinc fertilizer in combination to avoid the bioavailability of soil zinc after lime application. Promotion prospects China's citrus acreage is about 2.03 million hectares. The results of soil analysis showed that the effective zinc content in the soil of citrus orchards was mostly at a low level.
Among them, Shaanxi Province accounted for 100% of low level, Hubei Province accounted for 78.6%, Fujian Province accounted for 60%, Sichuan Province accounted for 55.6%, Chongqing City accounted for 53.9%, Guangdong Province accounted for 33.3%, Hunan Province accounted for 13.3%, indicating citrus orchard There are zinc deficiency problems in different degrees in the soil. It is imperative to increase the application of zinc fertilizer. The potential of zinc fertilizer in the above areas is huge. Provided by the Water Conservation Office of the National Agricultural Technology Center (Farmers Daily)
This article URL: Yellow patches in citrus leaves are zinc deficiency symptoms? Orange tree science application of zinc fertilizer technology
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