Improve the sowing quality of spring sowing corn, and actively make good selection of sowing seeds, fine soil preparation, timely sowing and so on, and it is very important for spring sowing of corn to preserve seedlings and harvest good harvests.
First, select the appropriate varieties of local conditions suitable to choose the right kind of road, according to the actual heat resources and production should choose the breeding period of 120 to 130 days of late-maturing varieties. According to the comparison of varieties in recent years, the varieties of spring corn with prominent comprehensive traits are Nongda 108 and so on.
Second, the application of base fertilizer spring corn due to a longer growth period using base fertilizer should master the principle of multiple applications, organic fertilizer as a base fertilizer should also be applied early, combined with site preparation for a one-time application, generally 2000 kg of organic fertilizer per acre. At the same time, with the application of chemical fertilizers, 30% of the total amount of nitrogen fertilizer can be applied as the base fertilizer. Phosphorus and potassium fertilizers can be used as seed fertilizers for one-time application at the time of sowing. Generally, 15 kg of diammonium phosphate, 10 kg of potassium sulfate, and sulfuric acid are applied. Zinc 1 to 1.5 kg.
Third, improve the quality of sowing
1. Fine site preparation. Spring maize requires deep plowing, and the sooner the autumn plowing, the better. After the harvest of the former crop, the stubble crop is promptly extirpated, which is beneficial to soil maturation, water storage and conservation, elimination of diseases, insects, and weeds. After cultivating, you must take care of it. In late autumn and early spring, we must also carry out work. In areas where the spring drought is severe, continuous operations such as pressure, concrete, and ramming are used to make the soil compact and more conducive to lifting and protecting the soil. For areas where the soil moisture content is good, direct sowing can be done. For areas with insufficient moisture, make up for sowing.
2. Seed selection and treatment. It is best to choose the seed to be coated when purchasing the seed. For seeds that have not been coated, seeds should be well-selected, sun-baked, and seed-dressed before seeding to achieve the purpose of neat, uniform, fast and early emergence. Seeds of different sizes are graded and sowed to improve seedling uniformity; seed drying can increase seed germination potential and germination rate, usually 2 to 3 days before seeding; seed dressing can effectively prevent pests from occurring. Can be used 50% phoxim EC 50 grams, add 1.0 kg of water evenly mixed, evenly sprayed on 20 to 30 kg of seeds, boring species 3 to 4 hours spread out, after sowing can effectively control underground pests; with 25% triadimefon The WP can be seeded with 0.3% to 0.5% of the seed amount, or 12.5% ​​of the WP can be seeded at 0.4% to 0.5% of the seed amount, which can effectively prevent the occurrence of diseases such as corn smut.
Fourth, timely sowing sowing of spring corn can easily lead to low-temperature rotten seedlings, seedlings are not uniform, sowing too late will result in late grain maturity. When the soil surface is 5 to 10 centimeters in depth at 10 to 12 degrees Celsius, sowing can be performed. The suitable sowing date in Hebei Province is generally from late April to early May. It is usually late in the morning in the south, late in the plain, and late in the mountains.
Fifth, rational close planting to increase planting density is an important factor in achieving high yields of spring maize. The soil fertility of higher plots is generally more than 4,000 planting densities; the lower soil fertility plots are suitable for 3500-4000 plants per acre, and the sowing volume is 2 to 2.5 kilograms. Planting methods are used for equal spacing or width and width, and sowing depth is 4-6 cm. Six, chemical weeding technology Chemical weeding saves time, effort, and the effect is also very good, but we must use safe and reliable corn field herbicides, and master its correct use. Chemical herbicides used in general spring corn fields can be treated with soil remediation agents such as et al. The amount of Ethanol mixture used 150-200 ml per mu and water 50 kg can be used to close the soil before seeding. For the soil with bad sealing effect can also be in the corn 3 to 5 leaf stage, weeds grow 2 to 4 leaf stage, with 4% of the Yule Fungus suspension dosage of 100 ml per mu, the amount of water 30 ~ 50 Kilograms were sprayed to kill weeds. When chemical herbicides are sprayed, care should be taken to choose morning or evening in windless days and relative humidity of 65% or more, and to reduce the number of nozzles as far as possible to achieve accurate drug quantity, adequate water volume, uniform spraying, and avoid re-spraying and missed spray.
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