Summer temperatures are high and hot, summer corn planting is also in high temperature and dry climate conditions, often problems such as poor pollination, poor fruiting, small grain, poor seed maturity, low germination rate, low seed production, poor commercial quality, etc. This led to the failure of seed production and caused serious losses to the seed producers and seed production units.

After many years of work practice, based on the adoption of various conventional technical measures, we have explored the measures for high-quality and high-yield double-protection of summer seeding corn seed production. Through the practical application of these measures, the yield and quality of corn seed production can be more effectively improved, and the yield per mu of summer sowing corn can reach 350kg, and the quality of seed quality and appearance can meet the quality requirements of spring seeding.

1. Apply enough base fertilizer to promote the end

After planting the seeds in summer, the germination and emergence of seedlings is faster, and the soil supply nutrients are relatively more per unit time. The lack of soil fertility supply is the limiting factor for the formation of strong seedlings in the early stage of summer maize seeding. Therefore, the summer sowing corn seed production must first apply the base fertilizer. According to the situation of fertilizer source, it is emphasized that the application of organic fertilizer is 3000-4000kg, 50kg of superphosphate, 15kg of potassium sulfate and 3kg of zinc sulfate. Before sowing, the three fertilizers are mixed into the soil at one time. Nitrogen fertilizer is applied with the next type of furrow, about 10kg per mu. During the growth period, the topdressing fertilizer is mainly nitrogenous, 30-40 kg per mu. The topdressing period is generally mastered in the "first-time high-level two-foot high (five-leaf period), two-time fertilization flashed over the waist (large trumpet period), three times fertilization sees the hairy (spinning period)", to ensure that the corn crops are fertile. The fertility of the period lays a good foundation for the production of high yield.

2, properly dense planting, to win more

Under the high temperature climatic conditions in summer, the growth period of maize is shortened, the plants are smaller, the relative ears are smaller, and the individual yield level is lower. Only by increasing the density and exerting the effect of population stimulation, the ideal harvest can be obtained. Specifically, the summer seed production should increase the density by about 1/3 compared with the spring seed production, and generally 6,000 to 7,000 plants per mu. At the same time, in order to ensure that the maternal plant has sufficient nutrient area, the father should be removed immediately after pollination, so that the mother can be ventilated and light, and the photosynthesis can be increased, which can increase the grain weight and improve the purity.

3, enhance the depth of sowing, ensure the whole seedling

When summer seeding is planted, the weather is hot, soil moisture evaporates faster, and it is easy to form dry soil layer on the surface, which affects the normal emergence of seeds. Therefore, the seeding of summer seeding should be appropriately increased, and the general sowing depth should not be less than 6cm.

4, the seed for coating or chemical dressing

The harm of underground pests such as tigers, cockroaches and golden worms is the main reason for the lack of seedlings and ridges in summer planting. The seed coating agent contains insecticides, compound fertilizers and trace elements, which can effectively control underground pests and ensure that the seedlings are full of seedlings. Therefore, in the summer seeding of corn, the seed seed should be coated with a seed coating or a seed dressing.

5, appropriate delay in the sowing period, avoiding the impact of high temperature on the parent powder and pollination

The "three volts" high temperature often leads to the metamorphosis of corn tassels, poor loose powder and declining pollen viability; the rate of water loss in the ear of the ear is accelerated, the time limit of pollination is shortened, and the pollination function is reduced, resulting in low seed setting rate of the female, often appearing Baldness, bald bottom, flower sticks, etc. Therefore, it is particularly important to use the delayed sowing period to adjust the silking period of the seeding parent to avoid the high temperature period. After the postponement of sowing, all the stages of growth of the seedling father and mother are shifted backwards, so that the maternal and maternal grouting maturity stages are in the cool autumn climate with large temperature difference between day and night, which can effectively reduce the respiration intensity of the plants. Reducing nutrient consumption is conducive to material accumulation, which is conducive to the improvement of grain fullness and 1000-grain weight, thus improving the yield and quality of corn seed production. According to the practice of summer seeding corn seed production for many years, the sowing date is more suitable around June 15th.

In order to obtain high yield, corn grown in summer needs to be done, base fertilizer is applied, proper planting is ensured, whole seedlings are protected, pests are prevented in time, and pollination is carried out carefully.

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