The reason is that they have some obvious mistakes in fertilization. First, they believe that the old cotton fields were originally fertilized more, and the amount of fertilizer was reduced when the corn was replanted. Second, the nitrogen and phosphorus fertilizers were applied, and the potassium fertilizer was not applied. It has been observed that this kind of corn plants grow slowly, the stems are slender, the main body is dwarfed, the tips and leaves of the middle and lower leaves are yellowed and scorched; the internodes are shortened, the leaves are long and dense; the ears are small and the ears are not full. There are many bald tops, low starch content and poor quality skin, which affects both yield and quality. In the field where potassium is severely deficient, the old leaves of the lower part of the plant gradually lose green and dull, and the tip and both edges are yellowed first, and then brown, dry and necrotic. The root system is small, from yellow to black and brown, the function of absorbing fertilizer and water is reduced, and then the loss of support ability leads to lodging. The experiment showed that the demand for potassium fertilizer in the early growth stage of maize was more urgent than that of nitrogen and phosphorus. The absorption of potassium in the third leaf stage was about 20%, and the rate of potassium was increased to 40% to 50% after jointing. The absorption amount has reached 80%-90%, and the absorption of potassium after the formation of the grain basically stops. Therefore, according to the law of potassium demand, the phase supply of potassium must be ensured to prevent blind application of potassium fertilizer. Reasonable application of corn and potassium fertilizer, first, applying 13-18 kg of potassium chloride per mu or 15-20 kg of potassium sulfate; secondly, advocating the application of organic fertilizer and potassium fertilizer as base fertilizer, applying 40 kg of bio-organic fertilizer per mu, with potassium fertilizer 10 Kg; the third is to prevent partial application of nitrogen fertilizer, so that nitrogen and potassium are imbalanced, causing symptoms of potassium deficiency; fourth is to open the ditch, deep application, should not be blindly applied. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Weighing Scale,Weighing Inidcator,Weighing Load Cell,Weighing Equipment,Electronic Scale,Weighing Controller Changzhou Satidi Import and Export Co., Ltd. , https://www.guanjiejts.com
It is necessary to apply more potash fertilizer to cotton fields.
In recent years, many farmers have replanted old cotton fields that have been planted with cotton over the years, and they have been idle. After all, the cost of materialization of corn is lower and the investment is less. But the same is the farmers who have replanted corn, and some of the benefits are not very satisfactory.