On the Management methods in the later growth stage of Rice planting

Pest control

1. 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.

2. Insect pests: the main pests in the later stage of rice growth are white-backed whitefly, brown whitefly, armyworm and rice longitudinal leaf borer. These four pests 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:

1. 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 the harmful substances such as salt, alkali and hydrogen sulfide in the soil through vertical infiltration, and bring the oxygen dissolved in water into the lower layer of the soil at the same time to enhance the activity of the root system.

2. Implement shallow water irrigation, implement intermittent irrigation in the later stage of grain filling, and alternate 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.

3. Topdressing foliar fertilizer and plant growth regulator. 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.