Rice pest control: why rice premature aging?

Why does rice senescence prematurely? How to prevent and cure premature senescence of rice? Please introduce the premature senescence of rice, which means that the leaves of rice are prematurely senile from heading to maturity, the leaves are brown, the top of the leaves are dirty white and dead, the leaves are thin and curved, the root growth is weak, and even a few black roots occur. The causes of premature senescence of rice: first, the water cut off too early in the later stage, resulting in the weakening of photosynthesis, or irrigation too deep, resulting in poor soil permeability, leading to early senescence of leaves; second, lack of nutrients; third, excessive density; fourth, excessive respiration at high temperature. Prevention and control methods of rice premature senescence: 1. To do a good job in rice water management, it is necessary to ensure sufficient water content. In normal weather, the shallow water layer should be maintained during heading, flowering and filling. For the fields with heavy clay and poor ventilation, it is generally appropriate to use gap irrigation, that is, shallow water is irrigated once, dries naturally in 2-3 days, and fresh water is added 1-2 days after wetting, so as to solve the contradiction between water and gas. 2. Supplementary application of grain fertilizer. For the field with premature senescence, 1-2% urea solution can be used for extra-root topdressing. 3. Timely prevention and control of diseases and insect pests. Click to get more rice planting techniques click to get more food crop planting techniques