Wet seedling raising technology of early rice: easy to operate and strong adaptability.

Rice seedling raising

The wet seedling raising technology of early rice is easy to operate and adaptable, and is suitable for raising seedlings of different rice varieties in different seasons (early and late seasons). It is widely used in the majority of farmers in our city. The seedlings cultivated with technical mastery have good quality, strong stress resistance and high yield. The standard operation of the seedling raising technique is briefly described as follows:

First, seedling field preparation: select fields that are leeward to the sun, rich in soil organic matter and convenient for drainage and irrigation. Seven days before sowing, dry ploughing and raking were carried out 7 days before sowing, and ditches were opened to make beds, with a width of 1.4 mi 1.5 m, a ditch width of 0.25 mi 0.3 m and a depth of 0.15 mi 0.2 m. According to the "ditch straight face flat, fat foot grass net, soft and hard moderate" requirements for bed adjustment. Combined with the application of compound fertilizer 15ml / mu and 20kg / mu, mix and rake the mud evenly.

Second, soaking seeds to promote sprouting: soak seeds in clear water for 24 hours, then soak them with 85% strong chloroform 300 Mel 500 times for 24 hours. Pick up the clear potion before sprouting. When sprouting, you can first use 38 Mel 40 ℃ warm water to preheat the seeds for 5 minutes, then put the grain seeds into baskets and seal them with disease-free straw to keep warm. Then, drench in warm water every 3 ℃ for 4 hours to keep the temperature at 35 Mui 38 min. When the grain seeds were whitened, the temperature was adjusted to 25 ℃ and 30 min to promote germination and root growth. Wait for the bud to grow half a grain and the root to grow 1 grain. Before sowing, spread the seed bud and refine the bud at room temperature for about 5 hours before sowing.

Third, sowing in the right amount at the right time: early rice in our city is generally sown in the middle of March, and the sowing amount per mu of rice field is: hybrid rice 35ml 40kg, conventional rice 50ml 60kg. When sowing, you can first sow 70% of the bud grain, then sow 30% evenly, and collapse the valley after sowing. After the grain collapse, the seedling field was sprayed with herbicide and then covered with film to keep warm.

Fourth, seedling management: early rice should keep the seedling bed moist and no water in the border ditch before emergence, so as to enhance soil permeability. After emergence to uncover the film before, in principle, do not irrigate water border, in order to promote root. When uncovering the film, you can go up to the bed in shallow water and keep shallow water on the seedling border. In case of cold wave, deep water can be used to protect seedlings. If the temperature in the film exceeds 35 ℃, the western end of the film should be opened for ventilation. After the second leaf stage, the seedlings can be cooled and refined by opening the film from 10:00 to 3pm on a sunny day and keeping the temperature inside the film about 25 ℃ in the sunny day, and covering the film in the evening. When the seedlings are in one leaf, each mu of urea and potassium chloride can be applied as "weaning fertilizer" to ensure the nutrient demand during seedling growth. Three days before transplanting, it is appropriate to apply urea and potassium chloride 2 kilograms each to make "marriage fertilizer".

5. Prevention and control of diseases, pests and weeds: after spraying herbicides to control weeds in the seedling field, weeds should be removed and blight should be controlled at the seedling stage. In case of persistent low temperature, 70% dimethazone should be sprayed to prevent seedling rot.