In the hot season, foliar spray fertilizer has the effect of “cooling down and increasing fatâ€. Foliar spraying with potassium dihydrogen phosphate solution, superphosphate and ash leaching solution is beneficial to both cooling and humidification, and can supplement the water and nutrients necessary for vegetable growth and development, but the water consumption must be appropriately increased during spraying. Spray concentration. In addition, tomato spraying 0.2%~0.3% longer than 0.1% zinc sulphate or copper sulphate solution can improve the heat resistance of the plant, and dip or flowering at the appropriate concentration of 2,4-D at the flower bud stage can prevent high temperature falling and Promote the expansion of the ovary. For flowers and fruits, such as pepper, spray with 30 mg / liter of chlorophenoxyacetic acid solution, which has certain control effect on falling flowers caused by high temperature. The temperature is high and the humidity is small. The fertilizer liquid is quickly evaporated and dried on the blade, which not only has poor absorption effect, but also is susceptible to fat burning. Therefore, foliar spray fertilizer should be sprayed in the evening after 7-10 am and 4 pm, preferably with no wind and cloudy days.
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