As a method of matching rice seedlings by hand-transplanting rice, wet rice seedling raising techniques are suitable for different regions, rice growing seasons and different types of rice cultivars. They are widely used in China. The technology is easy to operate, widely used, and adaptable. The seedlings grown in the technical control are of good quality and high yield.
1. Seesaw preparation. Choose leeward sunny, easy irrigation and drainage, high fertility, field flat rice fields as paddy fields, Putian and Honda ratio of 1: 8-10. About 10 days before sowing, dry tillage and dryness, smashing, smashing and smashing, and ditching to make rakes, rake length 10-12 meters, width 1.4-1.5 meters wide, groove width 0.25-0.30 meters, ditch depth 0.15 meters. The surface of the noodles meets the requirements of "the upper paste is loose, the ditch is deep and flat, the fat is full, and the soft and hard is moderate". Combined with soil preparation, 20 kg of compound fertilizer was applied per acre, and the fertilizer was mixed and applied after application.
2. Seed treatment and soaking germination. Select sunny days before sowing for 2 days. Adopt wind or salt water selection. Soaking seeds with seed soaking, strong Chloride, Prochloraz, etc. for seed disinfection, early rice soaking 2-3 days, late rice soaking 1-2 days, hybrid rice soaking for 1 day, conventional japonica rice varieties can be soaked for 3 days, soaking in northern temperature Low up to 5 days. The germination is preheated with warm water at 35-40°C for 3-5 minutes. The grain is then put into a cloth bag or a basket. The surrounding agricultural film and disease-free straw are used to seal and insulate. Generally, the water is poured every 3-4 hours. After the temperature is raised, the temperature is controlled at 35-38°C. When the temperature is too high, it is necessary to turn the pile. After the grain is white, the temperature is lowered to 25-30°C, and the temperature is appropriate to germinate and promote the roots until the shoot is long and half grain and the root length is 1 grain. It can be time. Before sowing, the seed buds are spread out and sown at room temperature for 3-6 hours after sowing.
3. Precision seeding. Early rice was sown in mid-and late March. Early rice hybrid rice field sowing volume 20 kg/mu, conventional rice 30 kg/mu; single-season rice paddy field sowing rate 7-10 kg/mu, conventional rice 10-12 kg/mu; double season late rice hybrid rice paddy field sowing The amount of 10 kg / mu, conventional rice 20 kg / mu is appropriate. When sowing, the length of the shoot is half the length of the grain, and the root length and grain length are appropriate. Seed sowing. The planting rate per unit area can be determined by the bud weight. When sowing, firstly sowing 70% of buds, and then sowing the remaining 30% make up. After the sowing, it collapsed. After the collapse, weed herbicides were used to block the weeds.
4. Film insulation. South China's early rice generally adopts the method of thermal insulation with arch cover plastic film, and can also be insulated with non-woven fabrics. A 40-50 cm high arch is erected with bamboo rafts, and the membrane is then covered with mud. The membrane is tightly packed with mud to prevent the wind from lifting. open. Single-season rice and continuous cropping rice have been installed in shading fields to prevent birds and torrential rains from sowing, and they have been removed after emergence.
5. Seedling management. Early rice seedlings kept moist, waterless sulcus to enhance soil aeration. Before emergence, it is not necessary to infuse water bottles to promote hair rooting. When the film is uncovered, it should be filled with water, and afterwards, there should be shallow water on the cockroach. In case of cold wave, it can be used to protect the seedlings with deep water. Early rice sown to Qimiao below 35 °C generally do not remove the film, higher than 35 °C, should be opened two ventilation cooling, Qi Miao to 2 leaf stage should begin to cool seedlings, sunny morning 10 am to 3 pm open two, Keep the film at about 25°C. Remove the film in the morning and cover the film in the evening to carry out the hardening. When removing the film, 4-6 kilograms of urea and potassium chloride are applied per acre per acre to make “weaning fertilizers†to ensure the growth of seedlings. The urea and potassium chloride can also be applied before transplantation. - 3 kg to do "send marriage fat."
Single-season rice and continuous cropping late rice remain till the surface of one leaf and one leaf at the heart stage, and the water in the ditch is free from water in case of “high-temperature sproutingâ€. There is still water in the ditch from 1 leaf heart to 2 leaf leafs in 1 heart period. No cracking, no watering, no cracking, no cracking, no irrigation, "running water," the upper part of the flood, after the 3 leaf period, shallow water irrigation, after the shallow water ground irrigation to promote childbirth, in case of hot weather, night irrigation can cool the night row. Late rice 1 leaf 1 heart rate topdressing "weaning fertilizer" and 300ppm concentration of paclobutrazol 75 kg per acre liquid spray, 4-5 leaves applied 1 "relay fertilizer", 3-5 days before transplanting Fertilizer, the amount of fertilizer should not be too much, each 3-4 kg of urea and potassium chloride per mu is appropriate.
6. Disease, pest and weed control. After the collapse, weed herbicides were used to block the weeds. During weeding, weeds should be removed timely. Early rice pays attention to control of blight and rice blast, single-season rice and late rice control rice thrips, leaf roller, and timely prevention and control of rice seedlings and other pests. Before transplanting, apply 100ml of water to 45kg of water and apply the medicine to transplant.
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