Pest Control:
Disease: The main disease that needs to be paid attention to during the late stage of rice growth is rice blast. The rice should be taken 2 to 3 times after the heading of the rice, and the interval is about 7 days. It can be used with about 300 grams of tricyclazole wettable powder per acre and 30 kilograms of water on the leaf surface.
Insect pests: The main pests in the late growth stage of rice are white-backed whitefly, brownish whitefly, armyworm and rice leafhopper. These four pests have long-range migratory and suddenness, and attention should be paid to timely prevention and control. You can use the grenade insecticide series produced by Guangxi Jiuhe----the special insecticide for rice leaf roller is mixed with the special insecticide of rice planthopper. The amount of mu is 30 ml, and the water is 45----60. Kilograms of foliar spray. The control effect is particularly excellent.
Water and fertilizer management:
Strengthening irrigation management in the late stage of rice is important to prevent premature senescence of rice, increase premature senescence in ground temperature, prevent rice blast, and increase yield. The rice needs more water in the later stage, the roots need more oxygen, and the water and oxygen have soil supply. This is easy to form the contradiction between water and gas in the soil. To solve this contradiction, the purpose of rooting and leaf conservation should be from three. Start with:
First, it is necessary to reinforce the field mantle, dredge the drainage, reduce the groundwater level, enhance the vertical permeability of the soil, and flow the harmful substances such as saline, hydrogen sulfide and the like in the soil through vertical infiltration, and bring the oxygen dissolved in the water into the water. The lower layer of the soil enhances root activity.
Second, the implementation of shallow water irrigation, into the late filling stage to implement intermittent irrigation, alternating wet and dry. The water layer is 2--3 cm. When it is naturally infiltrated, it will not enter the foot, and when the soil is not cracked, it will be filled with water. To master the water stop period, the water stop period is generally about 40 days after rice heading, or 7-10 days before harvesting. For paddy fields with high groundwater levels and heavy salinity, water conservation should be the main priority, and the water stop period should be postponed appropriately to prevent soil salt return and premature aging of rice.
Third, the application of foliar fertilizer and plant growth regulators. After rice panicle, it is not appropriate to apply nitrogen fertilizer in the rhizosphere, and the application of foliar fertilizer and plant growth regulator is an auxiliary measure to prevent premature aging of rice and late maturity. Spraying rare earth dihydrogen potassium and other foliar fertilizers according to the constant can promote the filling and promote the early maturity increase of the yield, generally 1 - 2 times. Due to the more rainy weather this year, especially during the rice heading period, there is continuous rainy and cold weather. The rice is slow to grout. For the long growing period, sowing and transplanting, there are a few late rice fields, which can be sprayed 40% in the early stage of rice filling. Ethephon 400----800 times solution. Ethephon has the effect of accelerating rice filling and premature maturity. After applying ethephon, the nutrients in the rice leaves are rapidly transferred to the panicles, which makes the leaves lighter and encourages the yellowing time to advance. However, it should be noted that ethephon is only a plant growth regulator. It does not increase the yield of rice that can mature normally. Generally, rice fields should not be ethephon, especially rice that is sprayed with ethephon.
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