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Rice growth late in cultivation
Pest control: Diseases: The main disease that needs attention in the later stage of rice growth is rice blast. Should seize the opportunity after the heading of rice 2 ~ 3 times, the interval is about 7 days. It can use about 100 grams of tricyclazole wettable powder per acre and 30 kg of leaf spray on water. Insect pests: The main pests in the late stage of rice growth are white-backed whitefly, brown fly aphid, armyworm, and rice leafhopper. These four pests all have long-distance migratory and sudden nature. Attention should be paid to timely prevention and control. The grenades series produced by Guangxi Jiuhe can be used as a combination of special insecticides for rice leaf roller and rice planthoppers. The amount of mu is 30 ml and water 45----60. Kilogram foliar spray. The control effect is particularly excellent. Water and Fertilizer Management: Strengthening irrigation management at the later stage of rice is very important for preventing premature aging of rice, increasing ground temperature and promoting early maturing, controlling rice blast and increasing yield. The later rice needs more water, the root needs more oxygen, water and oxygen supply the soil, which is easy to form the contradiction between water and gas in the soil. To solve this contradiction, to achieve the purpose of raising the root to protect the leaf, it should be from three. The following aspects: First, we must strengthen the field mantle, dredge drainage, reduce the groundwater level, enhance the vertical permeability of the soil, through the vertical penetration, the soil of salt and alkali, hydrogen sulfide and other harmful substances away, while dissolved in water Oxygen is brought into the lower layers of the soil to enhance root vigor. Second, the implementation of shallow water irrigation, into the late grouting to implement intermittent irrigation, alternating wet and dry. The water layer is 2---3 cm. When it naturally seeps out, it will not sink into the foot. If the soil is not cracked, it will be drowning. To master the water-cutting period, the water-cut period is generally about 40 days after the head of rice is full, or 7-10 days before harvest. For paddy fields with high groundwater levels and heavy saline-alkali soil, water conservation should be the main factor, and the water-cut period should be postponed to prevent soil salinity and premature aging of rice. Third, topdressing foliar fertilizer and plant growth regulators. After rice is full of panicles, it is not appropriate to apply nitrogen fertilizer in the rhizosphere, but applying foliar fertilizer and plant growth regulators is an auxiliary measure to prevent premature aging of rice and late-maturing glutinous rice. The spraying of rare earth potassium dihydrogen and other foliar fertilizers according to constant amount can promote grain filling and promote early maturation and yield increase. Generally, it can be applied 1-2 times. Due to the many rainy weather this year, especially during the heading of rice, there has been continuous overcast and low temperature weather. Rice is slow to grout. For the long growing seasons, sowing and transplanting, there will be a small part of paddy fields late, and 40% of the rice can be sprayed at the early stage of rice filling. Ethylene 400----800 times liquid. Ethephon has the effect of accelerating rice grouting and maturing ahead of time. After the application of ethephon, the nutrients in the rice leaves are rapidly transferred to the panicle, thus lightening the leaf color and encouraging the yellowing time to be earlier. However, it should be noted that ethephon is only a plant growth regulator. It does not increase the yield of normal mature rice. In general, paddy fields should not be ethephonous, and rice that is sprayed with ethephon cannot be used as a seed.
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