More potassium fertilizer should be applied to replanting corn in cotton fields

In recent years, many farmers changed the old cotton fields that used to grow cotton over the years to plant corn. This is a matter of leisure. After all, the cost of materialization of corn is lower and the number of workers is less. But the same is true for farmers who have switched to corn. Some of the benefits are not ideal.

The reason is that they have some obvious mistakes in fertilization. First, they think that the old cotton fields used more fertilization, and the amount of fertilized fertilizer was reduced when they changed to corn. Second, nitrogen and phosphorus fertilizers were applied partially and potassium fertilizer was not applied. It has been observed that these types of corn plants grow slowly, their stalks are slender, and the main body is dwarfed. The tips and edges of the middle and lower old leaves are yellow and scorch; the internodes are shortened and the leaves are long and dense; the ears are small and small, and the grain is not full. Baldness, low starch content, poor skin quality, affecting both yield and quality. In fields that are severely deficient in potassium, the old leaves in the lower part of the plant gradually lose their chlorosis and luster, and the tips of the leaves and the two edges of the plant become yellow, and then turn brown, dry, and necrotic. Less roots, from yellow to dark brown, absorption of fertilizer and water function decline, and then lose support to cause lodging.

Experiments show that the demand for potassium at the early stage of maize growth is more urgent than that of nitrogen and phosphorus. The absorption of potassium at the three-leaf stage is about 20%, and it is rapidly increased to 40% to 50% after the jointing stage. The potassium accumulation during the silking period Absorption has reached 80% to 90%. The absorption of potassium after grain formation is basically stopped. Therefore, according to this rule of potassium, it is necessary to ensure the supply of potassium by stages and prevent blind application of potash.

Appropriate application of corn potassium fertilizer, one is the application of potassium chloride 13 ~ 18 kg per mu or potassium sulfate 15 ~ 20 kg; second is to promote the application of organic fertilizer and potash mixed base fertilizer application of 40 kg of organic fertilizer per acre, with potash fertilizer 10 Kilograms; third is to prevent partial nitrogen fertilizer, so that nitrogen and potassium imbalances, causing symptoms of potassium deficiency; Fourth, it is necessary to open the ditch, deep facilities, avoid blindly spread.

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