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First, the typical symptoms of zinc deficiency in crops Rice: leaves are chlorotic and white, brown spots appear, plants shrink, often called "stagnation, sitting", "white seedling disease" and "shock disease". Corn: The leaves are chlorotic and have brown spots, forming "flower white seedlings", and the ears are lacking in grain and baldness. Wheat: White-green streaks or bands appear on both sides of the veins, the internodes are short, and the headings are late and not neat. In the case of severe zinc deficiency, the earing is not possible, and the ear is small and light. Cotton: The leaves of the seedlings are chlorotic, the edges are curled upwards, the stem elongation is inhibited, the internodes are shortened, the plants are clustered, the growth period is delayed, and the yield is low. Fruit tree: "macular leaf disease": the leaf veins of the upper and middle leaves of the new shoot remain green, and the veins are yellow. "Small leaf disease": The new leaves become smaller, and the tops are clustered like lotus seeds. "Small fruit disease": the fruit is small and thick, the pulp is lignified, and the slag is juicy. Vegetables: The middle and upper leaves are chlorotic and yellow, and the young leaves are small, often called "lobular disease". The plants are short, the internodes are shortened, the clusters are thick, the fruit is small, the yield is low, and the quality is poor.
Second, soil zinc deficiency is very common In the Hubei area, zinc-deficient soil accounts for about 70%, and the yield increase of crops after application of zinc fertilizer is generally between 10-20%.
In early spring, low temperature, high groundwater level, winter bubble field, muddy field, high altitude and low temperature, zinc is easy to be used. The application of zinc fertilizer should be emphasized. Alkaline soil has low effective zinc content, mainly distributed in the Yangtze River, Hanjiang Plain and Ebei Plain, and needs to be added with zinc fertilizer.
A large amount of compound fertilizer, phosphate fertilizer, and lime will induce zinc deficiency in crops, and zinc fertilizer needs to be added. The application of hybrid varieties and high-yield cultivation techniques requires more zinc in crops and requires the addition of zinc fertilizer.
3. Applicable crops and application effects Zinc fertilizer is applied to crops such as rice, corn, wheat, cotton, rape, fruit trees, vegetables, soybeans, peanuts, potatoes, tobacco, etc., which can increase crop yield by 10-30%, significantly improve and improve products. quality.
Fourth, the correct method of zinc fertilizer application 1. Paddy soil: 200 grams of large zinc per acre, can be used for seedling bed fertilizer in the field, Honda combined with soil preparation for the noodle fertilizer, mixing large zinc with granular fertilizer, fine soil and sprinkle Shi.
2. Dryland soil: 200g of large-grained zinc per acre. Before planting the soil, mix the large-grained zinc with the compound (mixed) fertilizer or fine soil, then apply it, apply it or apply it.
3. Application of fruit trees: The amount of large zinc in each fruit tree is 5-10 grams (10-30 grains, quantitative according to the size of the canopy), and can also be applied together with compound fertilizer and organic fertilizer, as spring fertilizer, strong fruit fertilizer, and fertilizer. Application, the tree crown is applied along the drip line to cover the soil.
4. Large-grained zinc should be applied as early as possible to meet the needs of the pre-growth period, and the effect is best. Zinc fertilizer should be combined with nitrogen, phosphorus and potassium fertilizers to exert greater fertilizer efficiency and obtain a better harvest. The application of zinc fertilizer should be strictly controlled and applied according to the recommended amount. Large zinc has an aftereffect, and zinc-deficient fields can be applied once a year or every other year.
(Hubei Academy of Agricultural Sciences Plant Protection Soil and Fertilizer Institute Ma Chaohong)
How to use zinc fertilizer for crops
Zinc deficiency in crops is one of the most common micronutrient deficiencies. The common characteristics of zinc deficiency in crops are: chlorosis of leaves, shortening of internodes, clusters, small leaves, short plants, and inhibition of growth, resulting in physiological diseases such as rice "frozen seedlings", corn "flower white seedlings", fruit trees "small fruit", The seed has a high open rate and low yield. 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 crops, increase the yield by 10-30%, and significantly improve the quality of agricultural products.
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