Key points of High-yield cultivation of Rice in the later stage of growth

Rice is called the late growth stage of rice from heading to maturity. The management tasks during this period are: first, to prevent and control diseases and insect pests, second, to prevent premature senescence of rice, and third, to prevent rice from becoming green and ripening late. In order to achieve these three goals, it is suggested that farmers should do the following work well:

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, Bemisia Tabaci, armyworm and rice leaf borer, all of which 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.

The ridge of the field should be strengthened.

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 to enhance the root activity.

Carry out shallow water irrigation

Intermittent irrigation was carried out in the later stage of grain filling, with alternation of 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.

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. 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 rice fields with long growth period, sowing and transplanting rice seedlings, 40% ethephon can be sprayed at the initial stage of rice filling. 40% ethephon 400 MULV 800 times solution mixed with flower and fruit doctor fruit can be multi-element. 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.