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How to use zinc fertilizer for crops
Zinc deficiency in crops is the most common trace element deficiency. The common characteristics of crop Zn deficiency are: leaf chlorosis, internode shortening, clusters, lobule, plant dwarf, growth is inhibited, resulting in physiological problems such as “stuck seedlings†of rice, “white seedlings†of corn, and “small fruits†of fruit trees. Seed-yielding rates are high and yields are low. The application of zinc fertilizer can promote the growth and development of crops, increase the seed setting rate, enhance the cold resistance and disease resistance of the crops, increase the output by 10-30%, and can significantly improve the quality of agricultural products. First, the typical symptoms of crops zinc deficiency rice: leaf chlorosis, brown spots, plant atrophy, often referred to as "freezing seedlings, sitting urn", "white seedling disease" and "reducing Miao disease." Maize: The leaves are chlorotic and there are brown spots, forming "flower white seedlings". Wheat: There are white-green strips or bands on both sides of the veins, and the internodes are short, and the heading and flowering are late and are not neat. Severe lack of zinc can not ear, ear small particles light. Cotton: Leaves chlorosis at seedling stage, curled upward at the edges, stem elongation suppressed, internode shortened, plants clustered, growth period delayed, yield low. Fruit trees: "Yellow spot disease": The veins in the upper and middle leaves of the new shoot remain green and yellow between veins. "Lobular disease": The new leaves become smaller and the lotus clusters appear at the top. "Small fruit disease": The skin is thick, the flesh is lignified, and the slag is less juicy. Vegetables: The middle and upper leaves are chlorotic, yellow, and young leaves, often referred to as "lobular disease." Plants are short, internode shortening, clusters, small skin thickness, low yield, poor quality. Second, the lack of zinc in soil is very common in the area of ​​zinc deficiency in the soil accounted for about 70%, after the application of zinc fertilizer crop growth rate is generally between 10-20%. Early spring, low temperature, high groundwater level, winter bubble fields, muddy fields, high altitude, low temperature areas are prone to zinc deficiency, should pay attention to the application of zinc fertilizer. Alkaline soils have low levels of available zinc, which are mainly distributed in the Yangtze River, the Han River Plain, and the Hubei North Plains, and require additional zinc fertilizer. A large number of application of compound fertilizers, phosphate fertilizers, and lime will induce zinc deficiency in crops and zinc fertilizers must be added. With the application of hybrid varieties and high-yield cultivation techniques, the amount of zinc required by crops is greater, and zinc fertilizers need to be added. III. Applicable crops and application effects The application of zinc fertilizer in rice, corn, wheat, cotton, rape, fruit trees, vegetables, soybeans, peanuts, potatoes, tobacco and other crops can increase the crop yield by 10-30%, significantly improving and improving products. quality. Fourth, the correct method of application of zinc fertilizers 1. Paddy soil: 200 grams per acre large grain of zinc can be used for seedbed paddy field fertilizer, Honda combined site preparation for manure fertilizer, the large zinc and granular fertilizer, fine soil mixing and sprinkle Shi. 2. Dryland soil: 200 grams of large grain zinc per acre. Before planting the soil, mix the large grain zinc with compound (mixed) fertilizer or fine soil, spread it, apply it or apply it. 3. Application of fruit trees: The amount of large grain zinc in each fruit tree is 5-10 grams (10-30 grains, according to the size of the crown), it can also be applied together with compound fertilizer and organic fertilizer, as a spring fertilizer, strong fruit fertilizer, and also as a positive fertilizer. Application, along the tree crown along the drip line after the application of the trench. 4. Large zinc should be applied as early as possible to meet the needs of the early stage of crop growth, and the best results are obtained. Zinc fertilizer should be combined with nitrogen, phosphorus and potash fertilizers in order to exert greater fertility and obtain a better harvest. Zinc fertilizer should be strictly controlled and applied according to the recommended amount. Large grain zinc has a post-effect, and zinc deficiency fields can be applied once a year or every other year.
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