Sophisticated sowing is a good measure to increase the yield and quality of corn, increase economic efficiency, and save costs. Using this technology, the yield can be increased by 10%, and the grain protein content can be increased by 1 to 1.3%. Its main supporting technology is: 1. High-quality selection of fine varieties should use compact large ear hybrids. The plant type is compact, the number of plants planted per unit area is large, and it is easy to establish a high-quality group structure. The precision seeding is the key to improving the quality of sowing seedlings and achieving a reasonable starting point for groups. Therefore, a high starting point is preferred to suit the local ecological conditions, and the market has comparative advantages. The seeds have typical characteristics, germplasm resources are abundant, there are many resistances, the protein content in the grains is high, the starch content is high in oil, and the number of green leaves in the late growth stage is high. To the old, easy silage, food and feed or special-purpose high-quality seed. Production practices show that high oil No. 3 and Ludan No. 17 can be planted as industrial raw materials. Nongda 108, Ludan 50, Denghai 11, etc. can be used as ideal food and feed for summer corn planting varieties. 2. Precise sowing of summer corn before sowing must be strictly screened for miscellaneous purposes. Drying 24 hours, divided into three levels according to seed size. Soak 1 day before sowing with 45-50°C warm water for 6-10 hours, remove and spread the moisture on the seed surface in the cool place, and use the seed coating agent to coat the seed ratio of 1:50 to reduce the seedling period. Pests harm to ensure that the seedlings are full. After the wheat harvest, the soil moisture is sufficient and can be sown with rakes. In order to ensure that all seedlings will be planted on one site, artificial ransacks will be required for fields with poor soil moisture. Plant sowing as early as June 15 to ensure high yields. When sowing ditch with water on demand, covered with wet soil. The seeding depth is 5 cm. Try to make the seeds in the same conditions to ensure that the germination is concentrated and the seedlings are neat. For the sorted seeds, the seeds are sown according to each level. One seed aphid seed sowing 1 seed; second seed sowing 1 seed as the first hole, 2 seeds sowing the second hole, sowing 1 seed as the third hole, seeding 2 seeds as the fourth hole and so on sowing; 2 seeds as the seed sowing of the third seed. Reduce the size of the seedlings, improve the uniformity of the starting point of the group, and achieve seeding precision. 3. Accurate specification and specification density Practice has proved that precision seeding is a key measure to establish a high-quality group structure, ensure the number of corn ears harvested, and obtain large spikes and fullness. The establishment of reasonable sowing specifications should be based on the characteristics of selected corn varieties. The fertility status and management level of the plots were determined. According to years of experimental research, the production of flat ridge sorghum planting in large and small rows is significantly better than that of equal row ridge ridges. Under the same conditions, the size of row planting is better than equal-row planting. At present, plants are planted with a large row spacing of 90 centimeters, a small row spacing of 30 centimeters, a plant spacing of 22 to 23 centimeters, and a combination of super high-yielding field spacings of 18 to 20 centimeters. The density of flat-type maize is to be thin, leaving 3,500 to 3,800 plants per mu. Compact corn, on the other hand, has a density of 4500 to 5000 plants per mu. Mainly in the spacing between the effective adjustment, the establishment of a reasonable density. In the 3 to 4 leaf stage of maize, the seedlings and the seedlings were planted. Reserve 2% of the scheduled number of spikes in the field for the preparation of seedlings. When there are missing plants in the field, transplant them with the transplanter and plant them. The weak seedlings were managed in a single plant to ensure that the strains had ear during harvest. 4. Harmless and Accurate Input In order to produce safe, healthy and harmless high-quality corn, it is necessary to implement full-scale detoxification and strictly control the critical point of harmful substances. In terms of soil selection and fertilizer application, the first is the use of a mixture of deep soil, loose soil, and good ventilation and drainage. The pH of the soil is between 6 and 7, the soil organic matter content is about 1.2%, there is no pollution, and there is no pollution source within 500 meters of the surrounding area. Field blocks. The second is returning straw to the soil and fertilizing the soil. In the 3 to 4 leaf stage after corn emergence, 200 to 250 kg of wheat straw is used for the mu, sprinkled on the wet corn and sprinkled between the corn rows. Spread some ammonium bicarbonate on wheat straw to promote rapid rot of straw and increase soil organic matter content. The third is to increase the maturity of farm fertilizer. Livestock and poultry manure is harmlessly treated. Solid manure is aerobically fermented, deodorized and matured within 5-7 days, and becomes active bio-organic fertilizer. Mu with 3,000 kg of fully cooked farmyard fertilizers returning soil to supplement the organic matter of the soil so that the micro-ecosystem of the maize rhizosphere is in a virtuous state. It is forbidden to use unconsumed farmyard manure, hazardous waste, sludge, and manure as fertilizers to avoid affecting the quality of corn. Fourth, strictly control the use of chemical fertilizers. Apply only urea, ammonium bicarbonate, no application of nitrate nitrogen fertilizer, and measure the soil formula. More than 650 kilograms of corn per hectare, the entire growth period requires 18 kg of pure nitrogen, 10 kg of phosphorus pentoxide, 8 kg of potassium oxide, 1.5 kg of zinc fertilizer, and nitrogen, phosphorus, potassium, and trace fertilizer, base fertilizer, and spike. The ratio of fertilizer and granules was 4:5:5. The base fertilizer is 40 kg of corn-specific fertilizer. In the 5 to 6 leaf stage after seedling setting, when the plant height is about 30 cm, balance seedlings are applied depending on the seedling condition to promote early growth. Shi Push fertilizer is applied again, 5 to 7 days before corn picking, and 10 kg of ammonium bicarbonate is used for flattening when the tenth leaf is flat. At this time, high temperatures and heavy rains occur throughout the year, which is unfavorable to the accumulation of nitrates, which will increase the utilization rate of fertilizers and compete for grain competition. Apply fertilizer at the right time, change the top dressing to foliar spray. With humic acid fertilizers, the water is sprayed during the corn filling period. Reduce the pollution of soil by fertilizers from the source and improve the quality of corn kernels and the quality of fresh straw. The fifth is biologically active fertilizer. After planting and digging corn, along the sowing ditch, 100 mu of liquid fertilizer with 100 tons of water is sprayed on 50 mu of water to activate the soil and increase the survival rate of corn seedlings and soil toxins. For the prevention and control of pests and diseases, comprehensive prevention and control based on ecological and biological control shall be implemented. After corn is harvested, the straw is quickly siled to reduce the pests of offspring. When corns are drawn, the tassels are pulled out of the rows to reduce the source of insects. In the middle of the middle leaves, 15 grams of BT emulsion and 3.5 kg of fine sand were mixed and made into granules to be put into the corn big bell mouth to prevent corn borer. Planted areas were planted and adult insects were trapped using a 450 watt high-pressure mercury lamp. Summer corn grows in the high temperature and rainy season, sowing the plate with no-tillage, the weeds grow quickly, occur early, and become susceptible to weeds. Before the seedlings were sown by maize, the mu was sprayed with 40 ml of 50% acetochlor in the water and 40 kg of water was evenly sprayed on the surface for chemical control. In the middle period of corn growth, weeds still affect the fields where corn grows. In the mu, 20% of the traceless water agent is applied to 100-200 ml of water and 30 kg of water. The directional spray on the bottom of the corn line is aimed at eliminating weeds. In the corn filling stage, timely irrigation of non-polluting natural water ensures ecological and physiological water use. 5, well-developed ditch summer corn growth in the rainy season, seedlings and weak seedlings, vulnerable to damage by flooding, the formation of water damage. Heavy rain often occurs in the middle and late corn crops. Occurrence of waterlogging often restricts the yield and quality of corn. Immediately after the sowing of corn, open the field trenches to create a suitable environment for growth. The trenches can communicate with each other, and the internal and external phases are connected to ensure that the channel system is smooth, smooth, and deep, and the requirements for irrigation, flooding, and watering can be met. 6. Appropriate fine harvesting for many years The practice of cultivation shows that the yield of grain harvested after 50-55 days of summer maize silking and pollination is the highest and harvesting is too early and too late, and the yield and quality will decline. The disappearance of the corn grain milk line, the loosening of the yellow leaves of the ear, the grain hardening, the appearance of intrinsic color, the moisture content of about 30%, the plant green leaves no more than five pieces of the most appropriate harvest, but also conducive to straw silage.
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