How to scientifically apply zinc fertilizer to crops
Zinc is an indispensable trace element for crop growth. Zinc deficiency can cause dwarf plants, short internodes, inhibited leaf expansion and elongation, leaflets appearing, and leaf margins appear twisted and wrinkled. Alzheimer's corn seedlings and rice seedlings are caused by zinc deficiency. Practice has proved that application of zinc fertilizer to rice, corn, wheat, cotton, soybeans, peanuts, potatoes and other crops can promote crop growth and development, increase seed setting rate, enhance crop cold resistance and disease resistance, and increase production by 10%-30. %, and can significantly improve the quality of agricultural products.
First, the application of zinc fertilizer
1. Base fertilizer: Mu with 0.5-2 kg of zinc sulfate, zinc fertilizer and organic fertilizer, physiological acid fertilizer (do not mix with phosphate fertilizer), fine soil mixed use. The ability of zinc to move in the soil is poor and the effect of surface treatment is not good. It should be turned into the soil along with the arable land, and fertilization should be uniform. Zinc has a long residual effect in the soil, and base fertilizers do not have to be applied every year. They can be applied every other year.
2. Roots: rooting with a solution of zinc oxide (0.1%-0.2% concentration), but rooting time should not be too long, generally 3 minutes, too long will produce phytotoxicity. Thistle root is particularly suitable for rice transplanting.
3. Soaking: The zinc sulphate is formulated into 0.02%-0.05% solution, seed and soaking solution is suitable for 1:1 (ie one kilogram of seed with one kilogram solution), immersed for 6-12 hours and then removed and dried (not recommended Exposure to the sun should dry it. Rice soaking can be soaked with 0.1% concentration for 24 hours. Peanuts, soybeans and other seeds should not be soaked, otherwise the seed coat will wrinkle and easily crack and affect the emergence.
4. Seed dressing: The amount of zinc sulfate seed dressing, 2-6 grams per kilogram of seed is appropriate. The specific operation is to first dissolve the zinc fertilizer with a small amount of water, and then dilute it with fresh water. When the seeds are seeded, all the seeds are soaked with zinc, the solution should not be too much, and finally the entire solution can be completely absorbed. Generally, 50 grams of seeds are suitable for 50 grams of water. Peanuts and soybeans may be added appropriately.
5. Top dressing: Mu with 0.5-1 kg of zinc sulfate mixed with a certain amount of fine soil or water, applied to the soil during the growing season. Paddy fields can be mixed with fine soil and can be applied to water. Spreading should be done after sunny dew, otherwise the fertilizer will stick to the leaves and cause burns. After fertilization, it is necessary to squat and shut down the field water in a timely manner to prevent the outflow of fertilizer and water. Dryland is generally applied to dry dung and water dung. The fertilizer is applied from outside the root, and 50-100 g of zinc sulfate per mu is used. After dissolving with water, 50 kg of water is applied. After 4 pm, foliar spraying is performed. When spraying corn, pay attention to the solution as far as possible not poured into the heart, so as not to burn the plants. Foliar spraying zinc fertilizer concentration and spraying amount can be increased or decreased according to the size of the plant. During spraying, if the concentration is too high to damage the leaves, it is best to add 0.2% slaked lime to adjust the pH of the solution.
Second, the matters needing attention
1. The application of zinc fertilizer should be suitable for the place, because of crops, avoid blind application. Zinc fertilizer is applied to zinc-deficient land and zinc-sensitive crops. In general, when the effective zinc content of the soil is less than 0.5 mg/kg, the effect of applying zinc fertilizer is significant; when the effective zinc content of the soil is higher than 1.0 mg/kg, zinc fertilizer is generally not required. As far as crops are concerned, the most sensitive crops for zinc are rice, corn, sorghum, soybeans, and cotton, and the moderately sensitive crops are potatoes. Special attention should be paid to the application of zinc fertilizer to these crops.
2. Zinc fertilizer cannot be applied simultaneously with phosphate fertilizer. Due to the combined application of zinc fertilizer and phosphate fertilizer, zinc phosphate precipitates are easily formed, which not only reduces the effectiveness of zinc, but also reduces the effectiveness of phosphate fertilizer.
3 zinc fertilizer can not be mixed with alkaline fertilizers, alkaline pesticides. Generally, zinc fertilizers should not be mixed with alkaline fertilizers such as lime, grass ash, and ammonia to avoid chemical reactions and reduce fertilizer efficiency. Similarly, it should not be used in combination with alkaline pesticides such as Bordeaux mixture, lime sulfur, and pine oleoresin in order to reduce the effectiveness of zinc and pesticides. Sex.
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