The late-season rice crops are tight in the season and subject to labor constraints. In recent years, the transplanting area of ​​late rice in the middle and lower reaches of the Yangtze River has developed rapidly. However, due to restrictions on the growth period and breeding techniques of the late rice varieties in the double-season rice, high yields of double-season late rice are obtained. To grasp the following technical points.
1. Variety selection. The variety of late rice machine intercropping is restricted by the previous crop, and affected by climate in the later period. The temperature is high during seedling raising and the seedlings grow fast. The seedling age is generally 12 to 20 days, and the seedling height is 12 to 22 centimeters and no more than 25 centimeters, so as to avoid machine-induced injury. . Therefore, it is required that the selected varieties have a moderate ripening period, are resistant to late planting and have a late tiller. For the late rice planting in the middle and lower reaches of the Yangtze River, the middle-maturing early-maturing varieties with a growth period of about 110 to 120 days should be selected, such as Tianyou Huazhan, Qianyou 0506, Yuxin 688, Tianyou 122, Wuyou 308, Wufeng. Excellent T025 and so on.
2. Seed sowing. The planting period shall be arranged according to the age of machine planting and the harvest time of early rice, so as to ensure that the seedlings are transplanted in suitable age. About 80 to 120 grams sowing each dry seed, 30 per acre, good seed disinfection and germination. Three days before sowing, the sampan board was made, and Putian and Honda were about 1 to 80. Slurry can be used for breeding or dry soil sowing seedlings, even sowing. Set up a shade net to prevent the impact of heavy rain on the seeds and remove the net after emergence. Seedlings 1 leaf 1 spraying paclobutrazol control the plant height, 150 to 200 grams per acre, 75 kg of water. The paddy field is kept moist and wet, and 3 to 4 days before transplanting, Tianqing irrigation ditch half-water saplings, or put water to regulate seedlings, to ensure that the machine can be inserted when the scorpion block can be kept.
3. Flatten field and age-appropriate machine insertion. After the early rice harvest, the soil was cleared in time, and the soil was immersed for 1 to 2 days. 1 to 2 days before machine insertion, the seedlings should be sprayed with pesticides, so that they can be transplanted with the drug and cure with one medicine. For continuous rice, 30 cm spacing, 12 to 14 cm plant spacing, 16.60 to 18,500 bushes per mu, 3 to 4 seedlings per cluster, and 5 to 70,000 mu per mu.
4. Rational fertilization and scientific management of water. During the Honda period, 12 to 14 kg of pure nitrogen, 20 to 30 kg of superphosphate, and 10 to 15 kg of potassium chloride are used. 60% of nitrogen fertilizer and total phosphate fertilizer were applied as base fertilizer. 5 to 7 days after transplanting, 5 to 6 kg of urea per mu, potassium chloride 8 to 9 kg. After rewatering, the field replanted with panicle fertilizer, applying 5-6 kg of urea per mu and 4-5 kg ​​of potassium chloride. Wet irrigation is the main method. After the second new leaf is grown, a shallow water layer is established. When the number of stem turns reaches 16 to 180,000/mu, the field begins to grow. When the sun shines on the edge of the field, small cracks appear. Rehydration; keep water after rehydration to heading and flowering. After the ear of rice was hooked, dryness and wetness alternated, and water was cut off about 7 days before harvest.
5. timely medication, comprehensive prevention and treatment. According to the prediction and prediction of pests and diseases, high-efficiency and low-toxicity pesticides were selected for chemical control. Pay attention to the prevention and treatment of S. japonica in the tillering period; pay attention to the control of sheath blight, rice leaf roller, and bacterial leaf streak disease at the booting stage; focus on the prevention and control of S. indica, rice planthopper, rice blast, rice smut After the grouting, the key control measures include rice leaf roller and rice planthopper.
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