There are many factors that determine the yield per mu of corn. Different geographical environment, varieties and cultivation management techniques may lead to different maize yields. Generally speaking, good light and heat conditions, high-quality disease-resistant varieties, standardized cultivation and planting, high yield.

In the southern region, the yield per mu can reach more than 900 kilograms. The cultivation investment of planting corn in a large area is not high and the management is not meticulous. The average yield per mu in a large area is about 650 kilograms. If planted at high altitude, the yield is less than 500 kg.

Methods of increasing corn yield

First, check the seedlings and make up the seedlings

Pay attention to the emergence of corn after its emergence. Because of sowing depth, seed quality, sowing technology and soil problems, there may be seedling shortage.

If there is a shortage of seedlings, they should be replenished in time. If there are not many seedlings, there is no need to replenish seedlings, which has little effect on yield. If the seedling shortage rate is higher than 10%, the seedlings should be replanted. The method of replanting is also very simple. Buy some corn seeds and reseed the missing seedlings.

Second, thinning and fixing seedlings

This situation is just the opposite of the above, which is a phenomenon of lack of seedlings and an excessive emergence of seedlings. For plots with too much sowing, such as sowing 5 kg per mu, the number of seedlings is too large and the number of effective seedlings in the field is too dense, which is not only not conducive to increasing production, but also leads to reducing production. Therefore, if the seedlings are too dense, it is necessary to manually pull out the excess corn seedlings to ensure a reasonable number of seedlings.

Third, control the king.

For plots with strong water and fertilizer conditions, corn is easy to grow vigorously at seedling stage. Once vigorous growth occurs, the ability to consume water and nutrients is enhanced, and lodging is easy to occur in the middle and late stages. Seedling stage is the best period to control vigorous growth. Therefore, if you encounter a plot of corn, you need to control it in time.

Control methods can be selected by spraying control agents, such as chlormequat chloride, paclobutrazol and ethephon. In order to improve the control effect, we should follow the three principles of "black control, yellow control, fertilizer control, thinness control, dryness control and humidity control".

Fourth, water.

In some plots, because the soil is dry when sowing, when corn emerges, on the one hand, the emergence rate decreases, on the other hand, the emerging corn is weak and the leaves are weak. In this case, irrigation should be done in time. It can not only promote the emergence of corn, improve the emergence rate, but also promote the normal growth of weak corn seedlings, so as to grow better in the future.

Five, intertillage

In some areas, corn may encounter continuous rainy weather or heavy rainfall at seedling stage. In this case, after the rain, the weather is sunny and the temperature is warmer, and the soil in the field is easy to harden, which is not conducive to the normal growth of corn. The practice of intertillage not only has the function of moisture conservation, but also is beneficial to the respiratory growth of roots and promotes the normal growth of maize seedlings.

Sixth, weeding

Weeding is one of the things that farmers have to do in maize seedling stage, and the importance of this article can be seen at the end. The best period of corn herbicide is 3-5 leaf stage, when weeds are about 2-4 leaf stage, and the resistance of weeds to herbicides is weak, even malignant weeds (reed, sedge, etc. ) is still in the grass stage, and spraying herbicides at this time can greatly improve the weeding effect. At the same time, in this period, the maize itself has strong resistance to stress, and it is not easy to cause herbicide damage.