Early-late rice heat damage
In order to reduce or avoid the threat of high-temperature heat damage, in addition to using high-temperature varieties, adjusting sowing, cutting period, so that rice sensitive to high-temperature damage to avoid the high temperature weather, but also to take the following measures to prevent.
The fertilizing material can be applied to the urea 2~2.5kg or the plant ash 8~10mn per acre when the last leaf is fully developed. The urea, superphosphate, etc. can be used to spray the water on the heading to heading stage.
Irrigation can be used to improve the microclimate in the field when the field is irrigated and the temperature is high. After deep-water irrigation at high temperature, it is possible to fill the night row with good growing fields, and water can be poured before 11 a.m., and drained at 2-3 o'clock in the afternoon to adjust the temperature and humidity during the high temperature period around noon. In addition, if necessary after the rice closes at noon, spray 200-250 kg of water per acre, generally can reduce the temperature 1 °C ~ 2 °C, humidity increased by 10% to 15%, and can maintain 1 to 2 hours.
Irrigation should be sprayed under conditions where the conditions are high, and it can significantly reduce the temperature and increase humidity. After a single spray, the field temperature can drop by more than 2°C, and the relative humidity can increase by 10% to 20%. The effective time can be maintained for 2 hours.
Spray chemicals 100 grams per gram of zinc sulfate, or 100 grams of potassium dihydrogen phosphate spray 40 to 50 kilograms of foliage.
Tanabe set up a screen for the Waseda, which is located at the windshield, and encountered hot and dry weather during the flowering period. A wind barrier can be set up at the field side of the wind, and a stake can be hit every 2 to 3 meters along the field. Membrane or other substitutable material is fixed on the stake.
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