Super-high-yield Cultivation Techniques of Double-cropping Rice in Southern China

(1) sow seeds at the right time and cultivate strong seedlings. Early rice seedlings are raised by drought, the sowing rate is generally 90g/m2, and the sowing date is in the middle and late March, while the seed amount of late rice is about 1.0kg / mu by sparsely sowing strong seedlings or raising seedlings in two stages.

(2) Ridge cultivation. The width of the border is 3 to 4 meters, the width of the ditch is 0.2 to 0.25 meters, and the ditch is well opened to facilitate water management and field operation and management.

(3) wide row and close planting. The planting density is 3040 clumps per square meter and the row spacing is about 25 cm. Generally, there are 3 to 4 early rice and single or double planting of late rice to ensure 6-8 tillers per clump.

(4) aerobic irrigation, promoting root and tillering. During the whole growth period of rice, in addition to shallow water irrigation in the sensitive period of water and fertilization, it is generally dominated by anaquifer or wet irrigation to promote root growth and enhance root activity. When the number of tillers reached about 90% of the number of seedlings per spike, the field was shelved many times to control the peak seedlings. Dry-wet alternation was used in the later growth stage to coordinate the root system's demand for water and air until it matured.

(5) accurate fertilization to improve fertilizer use efficiency. In this field, pure nitrogen is 1215kg, potassium oxide is 7.5kg, and phosphorus pentoxide is 5 ~ 6kg per mu. Among them, base fertilizer should account for 50% of the total nitrogen fertilizer, tiller fertilizer accounts for about 35% of the total nitrogen fertilizer, and the rest is used as panicle fertilizer. It is required to apply an appropriate proportion of organic fertilizer, generally 50 kg cake fertilizer or 750-1000 kg farm manure per mu.

(6) Integrated control of diseases, insect pests and weeds. During the seedling period, focus on the control of rice thrips, seedlings with medicine into the field; in the field stage, focus on the control of Chilo suppressalis, rice leaf borer and rice planthopper.