Zinc fertilizer is a material that has a zinc content to provide plant nutrients. The most commonly used zinc fertilizers are zinc plus selenium, zinc sulfate heptahydrate and zinc sulfate monohydrate. Basic zinc sulfate, zinc chloride, zinc oxide, zinc sulfide, zinc phosphate, basic zinc carbonate, zinc glass body, lignin zinc carbonate, zinc naphthenate emulsion and chelated zinc (Na2ZnEDTA zinc treasure) can be used as zinc fat. The latter three are organic zinc fertilizers and are easily soluble in water.
Zinc fertilizer can be applied, chased, soaked, seeded and sprayed. Generally speaking, foliar fertilizer is the best. The application of zinc fertilizer on zinc-sensitive crops, such as corn, rice, peanuts, soybeans, beets, kidney beans, fruit trees, tomatoes, etc., is better. Application on zinc-deficient soil: It is better to apply zinc fertilizer on zinc-deficient soil, and no zinc fertilizer is needed on soil without zinc deficiency.
If the plant shows symptoms of zinc deficiency in the early stage, it may be that the temperature in early spring is low, the microbial activity is weak, the fertilizer is not completely dissolved, the root activity of the seedling is weak, and the absorption capacity is poor; the antagonism of phosphorus-zinc may cause zinc deficiency. But by the time the temperature rose, the symptoms disappeared. The basic fertilizer is applied every other year: the zinc fertilizer is used as the base fertilizer, and the zinc sulfate is about 20-25 kg. It should be applied evenly, and it should be applied every other year. Because the zinc fertilizer has a long residual effect in the soil, it is not necessary to apply it every year.
[Precautions for use]
1. Do not mix seeds with pesticides: use about 2 grams of zinc sulfate per kilogram of seeds, dissolve in a small amount of water, spray on seeds or soak seeds, and wait until the seeds are dry, then carry out pesticide treatment, otherwise the effect will be affected.
2. Do not mix with phosphate fertilizer: Because zinc-phosphorus has antagonistic effect, zinc fertilizer should be mixed with dry fine soil or acid fertilizer, spread on the surface, and turned into soil with cultivated land, otherwise it will affect the effect of zinc fertilizer.
3, do not apply to be buried in the soil: when applying zinc sulphate, apply about 15 kilograms of zinc sulphate per hectare, cover the soil after ditch application, the surface application effect is poor.
4, dip roots do not take too long, the concentration should not be too large, with a concentration of 1% is appropriate, soak for half a minute, too long will occur phytotoxicity.
5, foliar spray effect is good: with a concentration of 0.1-0.2% zinc sulfate, zinc treasure solution for foliar spray, spray every 6-7 days, spray 2-3 times, but be careful not to pour the solution into the heart Leaves to avoid burning plants.
Medicinal materials, cotton, corn, fruit trees, watermelons, etc. are zinc-loving crops. Although the amount is small, they are very sensitive to zinc. Zinc deficiency will make these crops unable to obtain high quality and high yield.
The most important role of zinc in the physiological role of crops is sixfold:
First, enhance the ability of crops to resist disease. It has been found that zinc plays a decisive role in the growth of the meristems (roots and stems) of many plants. Zinc fertilizer can promote the roots to strengthen and make crops re-infect various root diseases, especially necrotizing diseases of cotton and cotton. The soil diseases such as blight, watermelon blight and mosaic disease of tobacco leaves, the incidence of zinc fertilizer is significantly reduced.
Second, participate in the metabolism of crop auxin. One of the main functions of zinc in crops is to participate in the metabolism of auxin. When zinc is deficient, the growth and development of the crop is stagnant. The typical manifestation is that the leaves become smaller and the symptoms are shortened, which is called "lobular disease" or "cluster disease".
Third, increase crop yields. Zinc is involved in the hydration of carbon dioxide in crop photosynthesis. Zinc deficiency can greatly reduce the photosynthesis efficiency of crops, and reduce crop yields and even crops. Applying zinc fertilizer will also increase production.
Fourth, improve the quality of crops. Zinc is closely related to protein metabolism, and protein synthesis is blocked when zinc is deficient. Tests have shown that zinc fertilizer can significantly improve the quality of crops.
Fifth, increase the fruit setting rate of crops. Zinc has an effect on reproductive organ development and fertilization.
6. Improve the stress resistance of crops. Zinc enhances the resistance of plants to adverse environments. It can not only improve the drought resistance and mites resistance of plants, but also improve the heat resistance and frost resistance of plants.
Therefore, medicinal materials, cotton, corn and other crops can significantly increase yield, improve quality, and enhance disease resistance and stress resistance, especially for alkaline soils in our city. According to the tests of the soil and fertilizer station in our city in recent years, the soil zinc content in our city has been significantly reduced from 4 PPM in 1985 to 1 PPM now, which is worrying. In some areas, symptoms of zinc deficiency in the soil have appeared. The lobular disease of perennial crops, the nematode disease of medicinal materials, and the serious rickets of tobacco leaves have occurred in large areas, which has made it impossible for the city to supplement the application of zinc fertilizer.
At present, the commonly used zinc fertilizer is mainly zinc sulfate. The zinc content is about 25%, which can be applied. It is best to use foliar spray. When spraying, master 2-4 two per acre, and apply 1-2 kg per mu. .
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