1. Apply shade net to cool down. High temperature weather advocates the use of shade nets to cover the top of the greenhouse to reduce the temperature inside the shed and reduce the impact of high temperature. For leafy vegetables that are not resistant to high temperature, the shade net can be used to cool down from 10:00 am to 3:00 pm in high temperature period. Other vegetable varieties should reduce the coverage time of the shade net according to the high temperature resistance of the crop or even cover it. In the vegetable and melon seedling stage, before the emergence of the seedlings, it is necessary to shave the whole day to reduce the evaporation of water, promote the emergence of seedlings, and gradually remove the shading net after emergence. It is worth noting that the shade net should not be applied in the rainy weather or when the temperature is reduced due to factors such as typhoon.
2. Strengthen fertilizer and water management. According to the principle of “thin fertilizer and diligenceâ€, fertilization is applied to promote the application of water and fertilizer integration technology to meet the requirements of water and fertilizer for vegetable growth. The noodle cover has the dual functions of soil conservation and cooling. The open vegetables advocate the application of straw or other crop straw to cover the noodles, combined with the application of phosphorus, potassium fertilizer, and Bishui to improve the resistance of vegetables. Leafy vegetables should be micro-sprinkler irrigation technology, and mountain vegetables should be “micro-storage micro-irrigation†system, spraying or watering in the evening or morning.
3. Strengthen pest and disease prevention and control. In the high temperature and drought season, there are mainly diseases such as blight, bacterial wilt, virus disease, Spodoptera litura, beet armyworm, B. tabaci, yellow-striped flea, diamondback moth, aphid, American leaf miner, bean wild carp, etc. Comprehensive prevention measures should be taken. The first is to adopt soil disinfection measures such as ploughing and ploughing, irrigating the fields, and high temperature shacks to reduce the number of soil pests and diseases; second, applying insect nets, insect attractants, insecticidal lamps, swatch traps, plant traps, etc. Measures to reduce the amount of pesticides; third, master the use of high-efficiency, low-toxicity and low-residue counterpart pesticides in the early stage of disease and low-age pests. Spray control in the morning and evening when the temperature is low, prevent plant phytotoxicity, ensure personal safety, and pay attention to strict safety intervals. It is strictly forbidden to use high-toxic and high-residue pesticides to ensure the quality and safety of vegetables.
4. Grasp the seedlings of autumn vegetables. The vegetable seedbed bed should keep the soil moist state as much as possible. In addition to watering in the morning and evening in the continuous high temperature and dry weather, the horse running water can be watered in the evening for 3-5 days to ensure the soil moisture of the seedbed and meet the requirements of the seedlings for water. Conditional micro-sprinkler irrigation, wet curtains, sprinkler irrigation outside the shed can be used to cool down and improve the growth environment of vegetable seedlings. The vegetables that use the shade net to cool the seedlings should be removed one week before the planting to remove the sunshade net for the gradual high-temperature refining, and improve the adaptability of the seedlings.
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