Due to the high temperature and high humidity during the whole growing season of summer corn, corn is vulnerable to multiple pests. Therefore, it is particularly important to improve the quality of sowing and cultivate good quality seedlings to lay a solid foundation for the entire growth period. To improve the quality of sowing and ensure that corn grows robustly, the following issues should be noted during sowing:
Pay attention to the choice of coated seeds. For seeds that have not been coated, seed treatment, such as seed selection, sun drying, and seed dressing, should be done before sowing. 50% carbendazim or triadimefon wettable powder can be used as a seed dressing. According to the seed amount of 0.2% to 0.3%, it can be used for seed dressing against an appropriate amount of water, which can effectively prevent corn smut, smut, root rot, etc. With 50% phoxim EC, according to the seed amount of 0.2% to 0.3%, with the appropriate amount of water seed dressing, can control underground pests.
Pay attention when sowing. As the saying goes, "Spring is in the fight, and in summer is the time of competition," early summer sowing has obvious yield-increasing effects.
Pay attention to controlling the sowing speed. The seeding speed should be controlled at no more than 4 km/h, and the phenomenon of lack of seedlings and ridges occurs at speeds above the General Assembly.
Pay attention to controlling the depth of sowing. The optimum sowing depth for summer corn is 3 to 5 cm. If the planting is too deep and the ground temperature is lowered, it is easy to plant seeds. Even if it can barely emerge, the seeds will be buried too deeply. The seeds will consume a lot of nutrients before being unearthed, and the roots of unearthed corn plants will have weak ability to absorb nutrients. Weak seedlings. Therefore, when sowing summer corn, sowing depth should be minimized under the condition of ensuring soil moisture.
Pay attention to the stable seeding rate. The general variety is 2.5 kg per acre, and if the seeding rate is too small, it is difficult to ensure the density. If the seeding rate is too large, the seed is wasted. Generally, the semi-compact type has a density of 3500 to 4000 plants/mu, and a compact plant density of 4000 to 4500 plants/mu.
Pay attention to the application of seed fertilizers. The amount of seed fertilizer used for looting and sowing is generally not more than 5 kg/mu, and the distance between chemical fertilizer and seeds is not less than 10 cm. If timely watering after sowing, the amount of fertilizer can be increased to about 15 kg per mu.
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