One, double membrane seedlings. Double film seedlings can be planted in advance to solve the contradiction between the mouth and mouth, to ensure that the seedlings are full, strong seedlings, and resistant to lodging and conservation of species. 1, nursery preparation. (1) Preparation of nutritious soil. Firstly, the fertile topsoil (80-90%), such as weeds, roots, and masonry, and compost or manure (10-20%), dried and screened, are mixed well and then added to each 100 kg of nutrient soil. Add 0.1-0.15 kg of superphosphate and a small amount of nitrogen fertilizer (ammonium sulfate). Each acre requires 2,500 kilograms of nutritious soil. The standard for nutrient soil fertility is generally 1.5% or more of organic matter, 0.1% or more of total nitrogen, 100 mg/kg of available nitrogen, and 30 mg/kg of available phosphorus. Watering 1 day before the water-making process (the amount of water is squeezed into a group by hand, and it is appropriate to disperse the chest and fall into the ground), and then use a system for making oysters or a system for making quails. The diameter of the quail is generally 5-6 cm and the height is 8-10 cm. Each weighs about 0.5 kg. (2) Seedbed preparation. Choose a place close to Daejeon, where soil is loose, drainage and irrigation are convenient. Apply organic fertilizer and a small amount of phosphorus, potassium, and nitrogen fertilizers. Seedbed land preparation requirements to achieve fine, flat, clean. 2, precision seeding. First spread a layer of drug sand (pesticide sand) evenly on the seedbed to prevent earthworms and underground pests, and then place the nutrient pods on the seedbed. Pay attention to flushing and arranging closely and neatly. Before sowing, use a watering can to pour enough water on the nutrient bowl so that the nutrient water reaches saturation and immediately sow. After sowing, cover soil 1 cm, and then use fine fertilizer to fill the interstices and finally cover the small arched membrane and cover the membrane with a small arch to facilitate moisture preservation. 3, seedbed management. (1) The seedbed should be kept moist before sowing and planting. After emergence, depending on the weather conditions and seedlings, it can be properly watered. When one leaf starts to grow, it begins to grow seedlings. (2) Suitable age transplanting. The seedling age is generally 25-30 days and transplanting begins at the three to four leaf stage. 5 days before transplanting, control the water. Transplanting should be carried out on a sunny afternoon or on a cloudy day. After transplanting, rooting water should be poured and then the rip of the mulch should be covered with fine soil. Second, field management 1, a reasonable fertilization. To widely apply organic fertilizer, basic fertilizer accounts for about 50% of the total amount, light Miao Fei, stable application of joint fertilizer, fertilizer dosage of 20-30% of the total fertilizer, re-apply booting fertilizer, fertilizer fertilizer accounted for the total amount of 60 %; In the later period, it is necessary to apply granule fertilizer, and the amount of fertilizer is 10% of the total fertilizer. Potassium fertilizer was applied, and 8 kg of potassium fertilizer was applied to Mushi. Applying zinc fertilizer can top 1.2 kg of zinc sulfate at the corn seedling stage. 2, control of pests and diseases. Maize diseases are mainly large and small spot diseases. For the field where the disease occurred, spray once every 10 days for a total of 2-3 injections. The agents used were carbendazim, zein zinc and the like. To prevent and treat corn borer, when it enters the big bell mouth, it is sprayed with 10% water-containing phosphorothioate 1000-2000 times in the upper middle of the plant to kill young larvae. 3, scientific management. More water is needed at the heading stage, combined with heavy panicle fertilizers to pour and attack the ear water, so that the soil moisture is maintained at 70-80% of the field water holding capacity. However, water can not be too much, too much water, will cause the lack of oxygen in the soil, male and female strains development blocked, increase the empty ear rate or cause lodging, so should do a good job of drainage.
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