Zinc is an essential nutrient element for the growth and development of potatoes. The lack of zinc affects the absorption and utilization of water and nutrient elements such as nitrogen, phosphorus, and potassium by potatoes, and reduces the ability of plants to resist drought and stress. Symptoms of "fern leaf disease (small leaf disease)" appear when potatoes are zinc-deficient. Plant growth is inhibited, the internodes are short, the plant type is dwarf, the top leaves are erect, the leaves are small in clusters, and the leaf edges are curled up. The leaves appear gray to Bronze irregular spots. In severe cases, brown spots or patches appear on the petioles and stems, and yellow spots appear on new leaves, which gradually spread to the entire plant. Drought and water shortage, high soil pH, calcareous soil, low organic matter content, low temperature and other factors are the main factors that reduce the effective zinc content of soil and cause zinc deficiency in potatoes. There are mainly the following methods of zinc fertilizer application: Soil application: 1 kg-2 kg zinc sulfate per mu is mixed with fine soil, organic fertilizer or physiological acid fertilizer, and evenly spread before planting and then turned into the soil, or when planting Apply it to the soil as a seed fertilizer. Foliar spraying: Use 0.1%-0.5% zinc sulfate solution to spray once every 10 days, and spray 2-3 times. Zinc sulfate can also be sprayed together with 1% urea solution or other good water-soluble foliar fertilizers, drought and stress resistance agents, pesticides, etc. Integrated application of water and fertilizer: Dissolve zinc sulfate in irrigation water, and use spray drip irrigation to fertilize with water. Generally, topdressing is applied twice at the seedling stage and budding stage, each time is about 0.5 kg per mu, which can be applied simultaneously with other water-soluble fertilizers. When the irrigation water is alkaline, the pH value should be adjusted to 5-5.5 before adding zinc sulfate to the fertilizer solution. Acid adjustment method: monitor the fertilizer solution with a pH meter, and gradually add sulfuric acid to a suitable pH range. But it should be noted: Avoid blind application. The soil should be tested, and the application should be based on zinc deficiency in the soil and crop growth. Second, avoid excessive application. Zinc is a trace element, and it is generally sufficient to apply 1 kg to 2 kg of zinc sulfate per mu. Three avoid simultaneous application with phosphate fertilizer. There is an antagonistic relationship between phosphorus and zinc, and mixed application can easily form zinc phosphate deposits and reduce fertilizer efficiency. Four avoid mixing with alkaline fertilizers and pesticides. Zinc is mixed with alkaline fertilizers such as lime, plant ash, ammonia water, etc., which is prone to chemical reactions to reduce fertilizer efficiency. In recent years, the experimental demonstration results have shown that reasonable application of zinc fertilizer to potatoes can significantly increase yield, improve quality and enhance resistance, and increase yield by 5%-20%. Commonly used zinc fertilizers mainly include zinc sulfate, basic zinc sulfate, zinc oxide, zinc carbonate, chelated zinc, zinc humic acid, zinc-containing urea, zinc-containing compound fertilizer, and zinc-containing water-soluble fertilizer. The main potato producing areas in Northwest my country, North China, and Southwest China are affected by drought and water shortage, high soil pH, calcareous soil, low organic matter content and other factors. The soil is generally deficient in zinc. The scientific application of zinc fertilizer has obvious effects in increasing production, and the application prospects are broad. . Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Viruses and bacteria are everywhere. Preventing them in advance is the best way to reduce the risk of infection. Wearing a mask and washing hands frequently are crucial. The new type of coronavirus has the characteristics of contact transmission, and the fact that the virus exists on the doorknob of patients with pneumonia has also shown the necessity of paying attention to hand hygiene and wearing disposable protective gloves.
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Technology of scientific application of zinc fertilizer on potato