Key Techniques for Rice Intensification (SRI)
1. Cultivate strong and strong, small and medium seedling transplants: According to the characteristics of varieties and local ecological conditions suitable for sowing, 100 meters per 100 meters seedbed organic fertilizer applied 100 kg, nitrogen, phosphorus and potassium ternary compound fertilizer 15 kg. The seeding rate is 10.0-22.5 g/m2. Putian period is generally 20 days. The seedlings are transplanted to Daejeon in a time of about 5 leaves. The roots are kept dry. When transplanting requires shallow insertion, seedling erect, reducing root damage. 2. A single rare plant: A single plant is beneficial to the development of roots and canopies and avoids multiple root competitions. Generally, the transplanting density of hybrid rice is 8000-9000 (plant spacing is 35-40cm20cm), and the transplanting density of conventional japonica rice is generally 11000-12000 (plant spacing 30-35cm20cm). Good soil spacing can be increased, for example, in the Tiantai hybrid rice Liangyoupeijiu transplanting density 6000-8000 strains, yield up to 732 kg. In the Yuhuan SRI demonstration area, conventional rice Chunjiangjing No. 2 was transplanted with 1.0-1.2 million bushes, yielding 716.8 kg per mu. 3. Aerobic irrigation: Transplanting shallow water transplanting rice, return to the green soil to maintain sufficient water, after the shallow water irrigation can be taken, such as the second dry irrigation after the dry, if the period of rain can meet the water requirements can not have water. In the vegetative growth stage of rice, 3-5 days wet and 3-5 days dry and wet-wet irrigation can be used to ensure that the soil is ventilated to facilitate root growth. The reproductive growth stage maintains a 1-2cm thin layer of water. In addition, water management measures depend on soil type, labor conditions, and other factors. 4. Precise fertilization: suitable for nitrogen fertilizer, increase the amount of potassium fertilizer, and pay attention to the input of organic fertilizer. Generally, 1,000 kg of organic fertilizer is required per acre, and all are basal fertilizers. The total nitrogen application amount is 13.5 kg (basal fertilizer: top dressing: panicle fat ratio is 6:3:1) and potassium chloride is applied 10kg (basal fertilizer: top dressing ratio 1:1). . In the later stage, potassium dihydrogen phosphate was sprayed 1-2 times in combination with pest control. 5. Comprehensive prevention and control: Because the rice intensified cultivation can not use water to pressure the grass in the field, and the weeds are easy to grow. The problem of grass damage is serious and weeding should be carried out chemically. Generally, about 7 days after transplanting, when the fertilizer is applied, herbicides are mixed and irrigation is performed. Rice sheath blight rarely occurs in rice intensification, but aphids are more harmful. Pest control is mainly based on aphids, vertical leafhoppers, and rice planthoppers, etc., and can be used for sharp neck, double insecticide, and bupropion, etc., and water consumption should be increased when spraying.