Planting techniques of Sweet Corn varieties in Spring

1. Dongtian 206 and other varieties can be planted on trial. These varieties have high yield, medium growth period, more than 16% sugar content in fresh seeds and good taste in fresh food. 2. Sow seeds at the right time and cultivate strong seedlings. Generally from March 15 to 20 or so to start sowing, must be covered with nylon film to raise seedlings. The sandy soil with loose soil, good fertility and plenty of sunshine was selected as the seedbed. After fine soil preparation, apply thin human manure once, arrange the corn seeds at a distance of 3 to 5 centimeters, and suppress them slightly. Then cover the seed with fine mud, about one centimeter thick. Then build a frame to cover the film to keep warm. The seedling age is about 20 days, and the leaf age is from 2 leaves to 3 leaves, which prevents over-age transplanting and reduces the yield. 3. Improve the quality of soil preparation and transplanting to ensure the uniformity of the whole seedling. Before ploughing, 25 kilograms of ammonium bicarbonate and 25 kilograms of superphosphate were applied per mu as base fertilizer. After ploughing, the land was prepared for bed with a width of 1 or 2 meters and two rows of crops. The fields with heavy soil stickiness can be fully fertilized at one time, that is, ditching in the middle of the border, applying 75 kg of ammonium bicarbonate, 25 kg of superphosphate and 15 kg of potassium chloride per mu. After covering the soil, apply 80% Acetochlor per mu or spray the border surface evenly to the water to control weeds. Then cover with plastic film and set it aside. However, in the leaky paddy field with heavy sand, fertilizer should not be applied at once, but should be fertilized according to the principle of "suitable application of seedling fertilizer and heavy application of ear fertilizer". After planting corn seedlings, 50% phoxim or 40% chlorpyrifos 1000 times solution was used to control underground pests. The transplanting density is 3300 to 3500 plants per mu, and the distance between plants is about 33 cm. After transplanting survived (about 7-10 days after transplanting), seedling fertilizer should be applied in time, generally using thin dung water or 10 kg ammonium sulfate per mu. 4. Strengthen the management. Sweet corn varieties have the phenomenon of multi-spikes, which should be removed in time, leaving one strong ear per plant. During the trumpet period, the corn borer was perfused with BT emulsion (Bacillus thuringiensis) 600x or 18% dipterex 500x, or 1000 times of 90% crystal trichlorfon. High toxicity and high residue pesticides are strictly prohibited. The use of any pesticides should be stopped 15 days before harvest. 5. Planting in isolation from ordinary corn. Sweet corn and ordinary corn should be planted in isolation, with an interval of more than 300 meters to prevent flowers from affecting the quality of corn. Fresh sweet corn can be sowed in batches to continuously supply the market, so as to avoid the loss caused by a large number of mature at one time.