Do you need topdressing to grow corn? Which leaf is the best topdressing for corn?

The biggest advantage of one-time fertilization is to save labor and time, but the yield has not increased. The whole growth period of maize is in rainy period, and some fertilizers in the soil are lost, which will lead to fertilization. Therefore, in order to obtain high yield of maize, rational fertilization is very important, and it should be applied at least once during the growth process. The seedling stage of maize is relatively small, and with sufficient base fertilizer, the amount of nitrogen fertilizer needed at seedling stage is not much, so topdressing is not needed at this stage. However, corn needs more nutrients after the big boll stage, and it is easy to remove some fertilizers.

It is suggested that fertilization should be applied at the big trumpet stage of corn. If it is machine fertilization, 6~9 leaves can be topdressing; if it is artificial topdressing, 10~ 13 leaves can be topdressing. There are two methods of topdressing: point application and strip application. After fertilization, cover with soil. When used in caves, the distance from plants is between 7- 10cm. In addition, let's talk about what fertilizer to use when topdressing. Corn needs more nitrogen in the whole growth process, and topdressing is the main method at the big bell mouth stage. This topdressing should be reapplied, but the specific amount of fertilizer should be determined according to soil fertility, and it is appropriate to apply more or less.

In the middle and low fertility plots, 60 kg urea can be applied per mu, and at the same time, potassium fertilizer can be applied appropriately, and potassium chloride 10 kg can be applied per mu. If it is a high fertility community, 30 kilograms of urea and 6 kilograms of potassium chloride can be topdressing at the big bell mouth stage. If you can't mix fertilizers, you can also use ternary compound fertilizer directly. To prevent zinc deficiency in maize, 0. 1% zinc sulfate can be sprayed on the leaves. In the plot lacking phosphorus, the effect of applying phosphate fertilizer to the roots in the later stage is not obvious and the utilization rate is low, so potassium dihydrogen phosphate can be sprayed on the leaves. First, after harvesting wheat in this plot, no stubble was left, and no base fertilizer was applied to the direct seeding corn, so topdressing at seedling stage promoted the growth of corn, which is also the key reason for topdressing at 5-leaf stage.

In addition to the reasons for top dressing at seedling stage, some farmers are interested in what fertilizer and the way of top dressing, as follows: the top dressing is compound fertilizer with content of 3. Why choose compound fertilizer? Because no base fertilizer is applied to the plot, the base fertilizer is generally compound fertilizer, so urea is recommended when topdressing the plot with base fertilizer. The amount of fertilizer applied per mu is 60 kg. The amount of topdressing alone may be more, but it is not too much for plots without base fertilizer. Urea is applied to the plot where the base fertilizer has been applied, with an area of about 30 kg per mu. Topdressing in the furrow. As shown below, it takes two people to pull and control the direction. An acre of land takes about 30-40 minutes. It is also suggested that ditch application should be selected as far as possible, which is beneficial to improve the utilization rate of fertilizer.