Key points of cultivation in the late growth stage of planting Rice

Pest control:

Disease: the main disease that needs to be controlled in the later stage of rice growth is rice blast. We should seize the opportunity to apply 2 Murray 3 times after heading, and the interval is about 7 days. Can use tricyclazole wettable powder per mu of about 100 grams, 30 kg of water foliar spray.

Insect pests: the main pests in the later stage of rice growth are white-backed whitefly, brown whitefly, armyworm and rice leaf borer. These four pests all have long-distance migration and sudden occurrence, so we should pay attention to timely control. You can choose the series of hand grenade insecticides produced by Jiuhe in Guangxi-a mixture of rice leaf roller insecticides and rice planthopper insecticides, with a dosage of 30 milliliters per mu and 60kg foliar spray on water. The effect of prevention and control is excellent.

Water and fertilizer management:

Strengthening the irrigation management in the later stage of rice is very important to prevent rice premature senescence, improve soil temperature and promote early maturity, control rice blast and increase rice yield. Rice needs more water in the later stage, the root system needs more oxygen, and both water and oxygen are supplied by soil, which is easy to form the contradiction between water and gas in the soil. in order to solve this contradiction and achieve the purpose of raising roots and protecting leaves, we should start from three aspects:

First, it is necessary to strengthen the ridge of the field, dredge the drainage, lower the groundwater level, enhance the vertical permeability of the soil, flow away harmful substances such as salt, alkali and hydrogen sulfide in the soil through vertical infiltration, and at the same time bring oxygen dissolved in water into the lower layer of the soil. enhance root activity.

Second, the implementation of shallow water irrigation, into the late filling stage of intermittent irrigation, alternating between dry and wet. When the water layer is 3cm, when it naturally dries up, it does not sink into the foot and the soil does not crack, then pour the stubble water. To grasp the water cut-off period, it is usually about 40 days after the full heading of rice, or 10 days before harvest. For the paddy fields with high groundwater level and heavy salinity, water conservation should be given priority to, and the water stoppage period should be postponed appropriately to prevent soil salinity and premature senescence of rice.

Third, apply foliar fertilizer and plant growth regulators. After full heading, it is not suitable to apply nitrogen fertilizer in the rhizosphere, but foliar fertilizer and plant growth regulators are auxiliary measures to prevent premature senescence and late ripening of rice. Spraying foliar fertilizer such as rare earth potassium dihydrogen according to constant amount can promote grain filling, promote early ripening and increase yield, and generally apply 1 Murray twice. Due to the more overcast and rainy weather this year, especially during the heading period of rice, there has been continuous overcast, rainy and low temperature weather, and rice filling is slow. For a small number of paddy fields with long growth period, sowing and transplanting rice seedlings, 40% ethephon 400 MUL 800 times can be sprayed at the initial filling stage of rice. Ethephon can accelerate grain filling and early maturation of rice. After the application of ethephon, the nutrients in rice leaves are rapidly transferred to the panicle, so that the leaf color becomes lighter and the yellowing time is encouraged earlier. However, it should be noted that ethephon is only a plant growth regulator and does not increase the yield of rice that can mature normally. In general, ethephon should not be used in rice fields, especially the rice sprayed with ethephon can not be reserved for seed use.