Technical measures for Prevention and Control of High temperature Heat damage of Rice

Rice high temperature heat damage generally refers to an agrometeorological disaster in which the air temperature exceeds the upper limit of the normal growth temperature of rice during the heading and fruiting stage, which affects the normal flowering and fruiting, resulting in an increase in the percentage of empty grains and a decrease in yield or even no harvest. Xuzhou collates the technical measures for the prevention and control of high temperature heat damage to rice. I hope it can help you.

First, the measures of daily irrigation and night drainage or sprinkler irrigation are adopted to reduce the temperature of ear layer and protect crops from high temperature.

The results showed that when the temperature was more than 35 ℃, the temperature around the panicle decreased by about 2.2 ℃ and the relative humidity increased by 3-4% after irrigation with 8-10 cm water layer in the field. In case of extreme high temperature in the later stage of flowering, the method of spraying water in panicle layer can also be adopted to reduce the temperature.

The second is to spray fertilizer outside the root to enhance the resistance and disaster prevention ability of rice.

It is expected that high temperature will come, combined with pest control at booting stage (15-10 days before flowering), spraying 50ml Kangduole 600 times solution per mu can prevent the physiological damage caused by high temperature and strong light.

If the flower has entered or is about to be flowered, spraying 50ml flower Dole 600 times liquid on the leaf per mu can effectively alleviate the damage of high temperature to flowering and pollination. In addition, spraying 3% calcium superphosphate solution or 0.2% potassium dihydrogen phosphate solution, plus dryland dragon, American star and other nutrient liquid fertilizer, can reduce high temperature heat damage and increase seed setting rate and 1000-grain weight.

For those who have suffered from high temperature heat damage and serious yield reduction, experts have given remedial measures: if they encounter high temperature heat damage during the heading and flowering stage, if the seed setting rate is less than 10% and the yield is less than 100 kg per mu, ratooning rice can be harvested and cultivated.