Summer high temperature crops also "heat stroke"
1, with water cooling. In the summer and autumn high temperature season, timely irrigation can improve the microclimate conditions in the field and reduce the temperature by 1-3°C, thereby reducing the direct damage to the flower organs and photosynthetic organs of crops caused by high temperature; when the high temperature weather around 35°C is encountered in the early rice filling stage, it is promptly directed to the field. Irrigation, night discharge, can avoid or reduce the "high temperature cooked"; some places in the hot season, the practice of rice irrigation in the morning, deep irrigation during the day, the evening horse irrigation method, the cooling effect is also very clear, deeper than the single irrigation The rate was reduced by 5.8-8.1%; dry crops were sprayed directly on stems and leaves through sprinkler facilities or sprayers, and also had a cooling effect. The cooling rate was generally around 1°C.
2. Artificially assisted pollination. During the high temperature and drought period, the ability of the natural loose powder to pollinize decreased. Artificial pollination of cross-pollinated crops such as corn and sorghum can reduce the influence of high temperature on the pollination and fertilization process of the crop, and the fertility rate can be increased by 5-8% compared with natural pollination.
3, outside the top dressing. In the high temperature season, spraying foliar fertilizer with urea, human urine, pig cow urine, potassium dihydrogen phosphate solution or calcium superphosphate and ash leaching continuously for many times is not only beneficial to cooling and humidification, but also can supplement the necessary growth and development of crops. Moisture and nutrition, but spraying must be properly reduced spray concentration, increase water consumption.
4, strengthen management. In the summer and autumn high temperature season, reasonable transport of fertilizer, can improve the nutritional status of plants, enhance the ability to resist high temperature and heat damage; sweet pepper sprayed with 30PPM of chlorophenoxyacetic acid solution, has a certain control effect on high temperature caused by falling flowers; tomato spray 2000- 3000PPM B9 solution, 0.1% zinc sulphate or copper sulphate solution can improve the heat resistance of the plant, enhance the anti-cracking and anti-sunburn ability, use 2,4-D dipping or coating, can prevent high temperature falling. And promote ovary enlargement; vegetable cultivation using plastic greenhouses, summer and autumn shade shade net covering shade, cooling effect up to 4-6 °C, and can prevent heavy rain, hail and locust direct damage to vegetables.
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