In the early stage of the early stage, the temperature is high and humid, and the low temperature is dry in the late stage. If the rice is improperly fertilized, the disease is serious, and the increase in empty mites causes the yield to decrease. The techniques for high-yield fertilization of late-season hybrid rice are as follows. In the early stage of hybrid rice production, the seedlings can be harvested in the early stage, and the high-yield can be achieved by the large grain weight in the later stage. The principle of “before and after heavy, intermediate control†should be adopted for fertilization, and the “30-day black, 40-day light green, 50-day green†should be achieved after the insertion. The appearance of the seedlings. "Wu" refers to the dark green color of leaves, the high chlorophyll content, the rapid growth of leaves and alfalfa; the "light green" is the performance of the development of stem and leaf fiber tissue; "green" is the performance of stem and leaf weight gain. Late-fertilized hybrid rice fertilization should be “pre-emphasisâ€, which means that the topdressing and base fertilizer amount after transplanting to the young panicle differentiation accounted for 70%-80% of the total fertilization amount. Base fertilizer per 667 square meters of human waste 25 ~ 30, ammonium bicarbonate 30 kg ~ 35 kg, superphosphate 20 kg ~ 25 kg, potassium chloride 10 kg ~ 12.5 kg. The first top dressing was carried out 7 to 8 days after the insertion of the seedlings, and the urea was applied for 5 kg to 7.5 kg per 667 square meters. The second top dressing was carried out 15 days after the insertion, and 25 to 30 tons of animal manure per 667 square meters. At this time, the maximum number of seedlings per 667 square meters will reach 200,000, and the effective number of spikes will reach 1875-200,000 per 667 square meters. Late-stage hybrid rice fertilization should be “intermediate controlâ€, which means that from the beginning of young panicle differentiation to the fifth stage of young panicle development, it is generally not topdressing, and only the second and third types of grass with poor growth are supplemented. The experience of the old farmer is: "One type of Wo stopped applying, the second type of Wo's broken clothes", three types of thin and thin. In the medium-term water control and fertilizer production, the exposed field is conducive to the stable growth and stability of the seedlings, so that the leaves turn to pale green after 40 days of insertion, reaching the deep roots of the root group, the stems are thick and the leaves are short and thick. Late-stage hybrid rice fertilization should be “post-heavyâ€, which means that the tail fertilizer should be applied later (also called ear fertilizer or attack fertilizer). The time and quantity of fertilization depends mainly on the growth of the seedlings. The seedlings do not turn light green, but may or may not be fertilized. When the flag leaves are half-drawn, the premature aging of the seedlings should be re-applied to promote the development of new roots, prolong the life of the last three functional leaves, and make the seedlings of the seedlings increase the seed setting rate. 4 kg to 5 kg of urea per 667 square meters, 10 kg to 15 kg of superphosphate, and 5 kg to 7.5 kg of potassium chloride. In the large fetus (the eighth stage of young ear development) and the filling stage, the foliar fertilizer is applied, 0.1 kg of potassium dihydrogen phosphate per 667 square meters or 0.5 kg of urea, superphosphate and potassium chloride, and 75 kg of water. spray. Spray once every 5 to 7 days, 2 to 3 times in a row.
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Late hybrid rice fertilization technology
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