How should southern early rice prevent high temperature during the period of high temperature? Technical opinions on Defense against High temperature in the late growth stage of Southern early Rice in 2018

At present, most parts of our country have entered the high temperature season, and many crops are not easy to grow. At present, the southern early rice is in the filling and fruiting stage, which is the key period for yield formation, so if we want to have a high yield, we also need to avoid all kinds of diseases brought by high temperature. how to prevent high temperature during high temperature?

According to the weather forecast, there will be persistent high temperature in the south of the Yangtze River, with a maximum temperature of 37 ℃ in some areas, up to 39 ℃ in the local area, and the number of high temperature days may last 6 Mel for 8 days. Continuous high temperature is not conducive to grain filling and fruiting of rice and affects 1000-grain weight. In view of the current growth situation and meteorological characteristics of early rice, the rice expert guidance group of the Ministry of Agriculture and Village, together with the National Agricultural Technology extension Service Center, put forward technical suggestions on high temperature defense in the late growth stage of southern early rice in 2018.

1. Adjust the temperature with water to reduce the canopy temperature.

When there is a high temperature of more than 35 ℃ during the grain filling period of early rice, the field can be irrigated with deep water to maintain a water layer of 5m / 6cm, increase the field humidity and improve the "microclimate" of the paddy field; day and night irrigation can also be used to accelerate rice leaf transpiration and reduce canopy temperature. Do not cut off the water too early in the later stage and force it to be cooked with high temperature.

2. Applying grain fertilizer to promote the recovery of growth

After the high temperature weather, for the lightly damaged fields, it is necessary to strengthen the field water and fertilizer management, promote grain filling, increase grain weight and reduce loss; for the seriously damaged fields, we should apply grain fertilizer, apply 2kg urea per mu or spray foliar fertilizer to delay the yellowing of leaves, enhance the photosynthetic capacity in the later stage, promote grain filling and fruit, and ensure safe maturity.

3. Strengthen monitoring and do a good job in pest prevention and control.

Under the condition of high temperature and humidity, diseases and insect pests are easy to aggravate. We should strengthen monitoring and early warning, strengthen the prevention and control of diseases and insect pests focusing on rice "two-migration" pests, rice blast and sheath blight, vigorously promote green prevention and control and unified control, improve the control effect, reduce the amount of pesticides, and effectively reduce the loss of diseases and insect pests.

4. harvest at the right time to prevent panicle sprouting

During the harvest period of early rice in southern China, there is more rainfall, which is prone to panicle sprouting, resulting in a decrease in yield and quality. It is necessary to make material and technical preparations in advance so as to grab a clear harvest at the right time. Vigorously promote the combine harvester with stalk shredding and sprinkling device to facilitate straw returning and stubble burying, and improve harvesting efficiency. Generally, about 25 days after heading, the whole ear loses green, and the glume is harvested when 90% of the glume turns yellow. Early rice should be dried or dried to the standard water content in time after harvest, and centralized drying is advocated to avoid mildew.