Rice heat damage prevention measures

As the saying goes, "Three points depends on the species, seven points depends on the management," and "Good-quality and good-quality methods match." The key to high yield is the management, especially at this stage, high temperature, high humidity, continuous rain, continuous wind, which coincides with the booting and heading stage of rice, and is the weakest growth stage for rice. If the management is not timely, the Prone to various pests and diseases, resulting in reduced production.

Recently, since its inception on July 12, due to the influence of subtropical high-pressure, high-temperature models have been introduced throughout the country. In response to persistent high-temperature weather in late July this year, the rice may cause certain high-temperature persecution, and appropriate preventive and remedial measures should be taken. .

High temperature sensitive period

Rice is the most sensitive to high temperature during heading, and it is a crucial period for inducing grain sterility within 1-2 hours of flowering. The second sensitive period is about 10 days before heading.

Effect of high temperature on rice

Rice high-temperature heat damage generally refers to a type of agrometeorological disasters in which the air temperature exceeds the upper limit of rice normal fertility and influences normal flowering and fruiting in the heading and grain-filling period of rice.

Precaution

1. During the high temperature period, the method of irrigation with deep water can be adopted, and conditions can be adopted to provide night irrigation or long-flowing water irrigation for cooling and humidification.

2. Apply granular fertilizer to increase seed setting and 1000-grain weight. Mutual application of 8-10 pounds of potassium chloride before the break can increase the plant's resistance, reduce the degradation of spikelets, reduce empty grains and increase grain weight.

3. Spray foliar fertilizers out of roots: Use 100 kg of potassium dihydrogen phosphate to water 30 kg for several consecutive times. Apply foliar fertilizers several times to cool and humidify the water and supplement the water and nutrients necessary for crop growth. Increases resistance to high temperatures. Spraying potassium dihydrogen phosphate solution during heading and flowering can also effectively reduce the degree of heat damage.

4. Deep water irrigation during flowering: The water layer in the flowering stage is maintained at 5-10 cm, which can reduce the temperature of the microclimate in the field by 2-3Â°C and reduce heat damage.

5. Strengthen pest and disease prevention and control: In particular, strengthen the prevention and control of pests and diseases mainly caused by sheath blight, rice blast, rice planthoppers and aphids.

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