Key points of rice management in August

First, apply rice field herbicides at the right time. In order to eliminate weeds in rice field, herbicides should be applied timely, which can not only save labor (no-tillage) and money (about 2 yuan per mu), but also solve the contradiction between weeds and rice seedling growth, which restricts the normal growth and development of rice seedlings. The specific method is to sprinkle 20 grams of straw long or 100 grams of urea (combined with topdressing), fine sand or dry Ni powder to dry dew for 7 days after insertion, and to keep the shallow water layer for 5 days.

Second, fertilize scientifically. More than 70% of the late rice in our province are hybrid rice, with a small number of original seedlings, and more than half of the seedlings are thrown, and the seedling period is short and less sturdy, so it is necessary to apply leaf-promoting fertilizer as soon as possible. Urea 20 jin per mu should be applied 7 days after planting, and Zhuang leaf fertilizer should be applied timely. 15 jin of compound fertilizer (or 20 jin of urea and 25 jin of potassium chloride) should be applied per mu 15 min 20 days after planting. Before and after the Autumn Equinox, it is best to spread lime powder 100Mu 150jin per mu, which can not only strengthen the seedlings but also enhance the resistance to insect disease. From mid-late September to early October, about 10 jin of compound fertilizer was applied to strengthen the fetus and grains.

Third, timely and rational drainage and irrigation. Although the growth period of rice needs more water, from its normal physiological requirements, it is afraid of both drought and waterlogging, so it is necessary to maintain shallow irrigation from planting to the peak tillering stage, avoid soaking, promote the early growth and rapid growth of rice plants, and keep the field moist in the future. In the high-yield rice fields with deep soil layer, we should also do a good job of drying the fields in the middle and later stages, and only maintain the shallow water layer ten days before heading to meet the water requirements for booting and heading. Then, the water layer on the surface of the field should be drained to keep the soil layer moist.

Fourth, strengthen the prevention and control of diseases and insect pests. First of all, it is necessary to seriously and often go deep into field investigation and research to do a good job in forecasting and forecasting work, especially for those historic recurrence areas of diseases and insect pests, such as the discovery of diseases and insect pests, we must achieve timely, continuous and thorough treatment. The resistance of newly introduced rice varieties to diseases and insect pests should also be carefully observed. The disease of late rice is mostly sheath blight. If there is high temperature and continuous rain in the field from the peak tillering stage to the young panicle formation stage, the disease is easy to occur in the dense growing paddy field. If it is found that 1% Jinggangmycin should be sprayed in time, add 200 jin of water and 300 jin of water, or spray with 1000 times of 50% topiramine wettable powder, if a serious 5 jin occurs, spray it again in 7 days. In terms of insect pests, Chilo suppressalis and Chilo suppressalis occur only in individual years and areas, and the most common occurrence is Chilo suppressalis. It mostly occurs from mid-late September to early October to damage flag leaves and top two or three grass leaves. When seriously damaged, it not only affects normal heading and flowering, but also directly leads to the increase of blighted grain and the weakening of 1000-grain weight, which has a great impact on yield. The disease can be sprayed with 18% insecticidal double water agent 40 grams per mu plus 100 kilograms of water or 150 kilograms per mu with 1000 times of 90% crystal trichlorfon, preferably in the evening. It should be sprayed as soon as possible when it rains within six hours after spraying.