The high temperature in summer brings many harms to the growth and development of vegetables, such as causing plants to lose water, leggy, and loss of disease resistance, and induce a variety of pests and diseases. Hot weather, hail, and thunderstorms are also the basic causes of autumn vegetables. Therefore, it is particularly important for vegetable cultivation in summer to do a good job of high-temperature defense in vegetable production.
First, select varieties of heat-resistant disease-resistant varieties can be selected according to local conditions, suitable for local cultivation of high temperature, disease resistance of the stronger vegetable varieties.
Secondly, intercropping with high-stalk crops to make full use of the shade of high-stalk crops, and to improve the mix between Xiyang and Xiyin crops. Such as eggplant and pepper intercropping, corn and pepper intercropping, in mulberry, tea, orchards within the interplanting ginger.
Third, timely coverage of cooling in the summer and autumn nursery, it is best to take shady shed sunscreen. In the summer and autumn, it is best to cover the shading nets and protect the insects. Open sweet peppers can be used to cover shade nets, sun protection (virus disease). Sun protection nets or sunscreens can be applied to the shelter film. For bare ground between the crop lines, a layer of wheat straw, straw, crushed straw and other materials can be spread to prevent the ground temperature from being too high. In order to prevent the watering away from the cover, some soil can be pressed on it. For fruits exposed to sunlight, some weeds, old newspapers, etc. may be covered on them to prevent sunlight from burning the fruits.
Fourth, the use of their own leaves shading sunscreen summer and autumn high temperature period, should make full use of shade to protect fruit and trees. For example, when topping a tomato, leave two layers of leaves on top of the top layer of fruit so that the young eggplant can be shaded and sun-protected. After eight mature cabbages and broccoli are croqueted, the outer leaves are removed and covered on a leaf ball. Sunscreen, improve quality. Cultivation of vegetables in summer and autumn is generally suitable for close planting and should not be sparse, to play a mutual shade, which is conducive to growth.
5. Reasonable watering Watering is one of the most effective measures for alleviating high temperature weather. The number of watering and the amount of watering each time can be appropriately increased. When conditions permit, water spray can be used or sprayed on the leaves to prevent dehydration of the leaves. The time should be selected in the early morning or late afternoon. Do not water at high temperatures at noon. Use well water or low-temperature river water, and pour it thoroughly to keep the soil moist. After the thunderstorm, drain the water in time and pour cool water to prevent it from being damaged by hot rain.
Sixth, timely fertilizer according to the type of vegetable crops and growth stage, combined with watering, timely fertilizer, but can not apply human urine. Nitrogen, phosphorus and potassium should be used in combination with nitrogen fertilizers such as seedlings, supplemented by phosphorus and potash fertilizers; phosphorus and potassium fertilizers should be the main outcomes, supplemented by nitrogen fertilizers. At the seedling stage, the initial stage of the results, and the fruitful stage of the results, the topdressing should be performed once; when the leaves are yellow and weak, they can be sprayed with 0.1%-0.2% potassium dihydrogen phosphate solution, sprayed with Baobao and Aonong to promote vegetable growth. Prevent premature aging of leaves. Especially after the thunderstorm, it is necessary to strengthen the cultivating loose soil and timely apply topdressing fertilizer.
VII. Symptomatic prevention and control of pests and diseases From the initial flowering stage of tomato or the rosette stage of Chinese cabbage, a mixture of calcium chloride and naphthalene acetic acid is sprayed to prevent or treat umbilical rot or dry heart disease; naphthalene acetic acid, anti-dropping agents, 2,4D, etc. may be selected. Plant growth regulators to treat the flowers of Solanum or legumes to prevent flowering and fruit drop; to spray virus A, phytosanitary bactericide, bacteriocin and other agents to prevent virus diseases; to spray triadimefon, Wuycin, Fuxing, etc. Pharmaceutics, prevention of powdery mildew; spray acaricides, control of lice. However, it should be noted that vegetables that are sprayed should be listed after the safety interval so as not to affect human health.
VIII. Reducing the hail loss The heavy locust plague can be changed to other crops; if the locust plague is light, the crop can continue to grow. You can spray 72% agricultural streptomycin-soluble powder 4000 times, or 77% to kill it. 500 times wettable powder, and then topdressing topdressing to promote plant growth.
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