1. Choose suitable varieties. Choose suitable varieties according to local conditions. After the varieties have been tested and demonstrated for more than two years in the area, if the performance is suitable, they can be promoted. For example, the PSDF model of Dr. Jin Seed Industry is very suitable for the basis of selection. Under normal circumstances, the selected varieties should be subject to the local approval or introduction and filing of the relevant departments, and obtaining the legally promoted and planted varieties as a prerequisite.

2. Fine ground preparation. Spring corn requires deep plowing, and the earlier the autumn plowing, the better. If there are previous crops, the stubble should be promptly tilled after harvest, which is conducive to soil maturation, water storage and moisture preservation, and elimination of diseases, insects, weeds, etc. After ploughing to preserve moisture, moisture preservation work should also be carried out in late autumn and early spring. In areas with severe spring drought, continuous operation of pressing and harrowing is used to make the soil compact, which is more conducive to improving moisture content. For places with good soil moisture content can be planted directly, and for places with insufficient soil moisture content should be planted with supplementary soil moisture.

3. Seed selection and treatment. At present, the varieties that are promoted and planted on the market are basically treated with coating agents, and there is no need to make a second coating after purchasing the seeds. Try not to buy uncoated seeds. For places with serious diseases and insect pests, according to the actual situation, the original coating components of corn seeds can be reasonably matched with pharmaceutical coatings. Before sowing, you must do a good job of drying the seeds, especially the earlier purchased seeds. Before sowing, they must be simply aired. The seed bags must be opened to open the seeds to dry.

4. Sowing in the right time. Too early sowing of spring maize can easily cause low-temperature rot and uneven seedling emergence, and too late sowing will result in late seedlings that cannot mature normally, greedy green and late maturity, and reduce yield in the event of frost. Generally, the ground temperature of the 5-10 cm soil layer is stabilized at 8 ℃ ～ 10 ℃ as the standard for the beginning of the suitable sowing period of spring corn. During spring sowing, the temperature rises quickly, and the sowing period is generally only about 10 days. Sowing should be done early and shorten the sowing period. In general, the suitable sowing period for spring corn is from mid-April to mid-May to mid-May.

5. Apply foot fertilizer. Because of the long growth period of spring corn, the principle of more application should be mastered when using base fertilizer. Organic fertilizer should be applied as base fertilizer early, combined with land preparation and one-time application. Generally, 2,000 kg of organic fertilizer per mu is applied. At the same time, with the application of chemical fertilizers, 30% of the total nitrogen fertilizer can be applied as a base fertilizer. Phosphorus and potassium fertilizers can be used as seed fertilizers and applied at the time of sowing. Generally, 15 kg of diammonium phosphate, 10 kg of potassium sulfate, and sulfuric acid are applied per mu. 1 to 1.5 kilograms of zinc. If planting is done mechanically, chemical fertilizers can be planted at the same time as the planting fertilizer. Apply 1 bag of compound fertilizer per mu, and then apply topdressing in combination with irrigation during the large bell mouth period.

6. Reasonable dense planting. Increasing planting density is an important factor in achieving high yield of spring corn. The planting density of plots with higher soil fertility is generally around 4500 plants; plots with lower soil fertility should be about 4000 plants per mu. See the instructions on the back of the seed package for details according to the planting density required by the variety instructions.

7. Chemical weeding. Be sure to choose reliable herbicides for corn fields and master their correct usage methods. Generally, there are two kinds of herbicides for corn field, one is closed herbicide (can be sprayed after sowing), the other is post-emergence herbicide, which is sprayed at 3~5 leaf stage after corn emergence. The use of herbicides must be operated according to the type and requirements of the herbicide. During the spraying process, the concentration of the herbicide should be diluted as much as possible, and then sprayed slowly and evenly, so that the effect is better.

8. Thinning and fixing seedlings. When planting seeds, increase the amount of planting appropriately according to the planting density. There is a saying among farmers that "you have money to buy seeds, but you don't have money to buy seedlings." During the emergence of corn, check the emergence of the seedlings, and the appropriate increase in the amount of seeding is to ensure the emergence rate and the planting density per acre. Seedlings in the three-leaf period and fixed seedlings in the five-leaf period. If there is a shortage of seedlings, transplant the seedlings in rainy days.

9. Irrigation and fertilization. Water and top dressing at the right time.

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