In summer, there are many high-temperature weather. If no effective measures are taken to reduce the temperature in the greenhouse, vegetables may prone to prolonged growth, wilting, sunburn, falling and fruit dropping in a high-temperature environment. A few days ago, Du Zhihui, a senior agronomist at the Northwest A&F University’s College of Horticulture, told reporters that it was necessary to pay attention to issues such as ventilation, water and fertilizer application, and pest and disease control in greenhouses, so as to ensure summer greenhouse vegetable safety.
Take precautions against vegetable sunburn
Exacerbation Exhalation Sunburn occurs severely under high temperature and strong light. Therefore, when the temperature is high during the daytime, the air outlets at the upper part and the front face of the greenhouse should be opened to enhance ventilation, thereby reducing the temperature inside the greenhouse. After the air outlet is opened, it is necessary to pay attention to tighten the pull rope for adjusting the air outlet so as to avoid people from leaving the wind and shutting the air outlet and causing high temperature hazards.
Overshadowing nets Du Zhihui said that shading nets have a variety of functions such as blocking light, lowering high temperatures, and preventing rainstorms, which can effectively improve the environment of crops grown in the summer and autumn and high temperature seasons, and avoid the risk of plant exposure and sunburn. On the leafy vegetables such as leeks, celery, onions, etc., the use of shade nets to cover the cultivation, can be appropriately sown early listing, improve the quality of vegetables, after sowing can also be used to cover the surface, after the emergence of late cover early cover. Conditional greenhouses can be covered with insect-proof nets covering the entire network or around them, and physical measures can be used to isolate pests and reduce pests and diseases.
Take measures to prevent heat damage
Scientific application of water and fertilizer "Greenhouse shed 3 to 5 days, once the water, each time the amount of watering not too much, a small water pouring, it is best to interlace or ridge pouring." Du Zhihui suggested that in the hot and dry morning, night, dishes Tian should adopt micro-irrigation and micro-injection technology, which can play a role in humidification and cooling, regulate soil water, fertilizer, gas, and heat, and effectively reduce the harm of drought to vegetable production. The combination of fertilizer and water integration technology has the advantages of labor saving, labor saving, water saving, fertilizer saving, and efficiency enhancement, and can improve the commercial quality of vegetables. Pay attention to cultivating and weeding, covering crops, applying fertilizer in a timely manner, and maintaining soil loosening in vegetable fields to reduce evaporation of soil moisture. Apply the principle of thin-fertilizer to the ground and generally apply it in the morning or late afternoon. Conditional greenhouses can be top-dressed with drip irrigation and sprayed. Foliar fertilizer.
Correct prevention and treatment of dead trees Whether it is spring or summer stalk vegetable or the kind of dead trees caused by germs, the wilting and dead plants are first completely removed, and the soil removed at the same time is disinfected to avoid spreading with water. For vegetables that are not very serious, timely injection therapy should be performed. Simultaneously, 500 times more meladin should be administered with coloammy copper 1000 times or 1200 times with bromobromoisocyanurate. Rooting agent should be added when irrigating root. Stimulates capillary root regeneration.
Comprehensive policy measures to strengthen pest control
In recent years, summer flea beetles, whiteflies, leafflies, aphids, moths and other vegetable pests have become more common, and red spiders, thrips, etc. have become more and more harmful to cowpea and onion crops. We must adhere to the principle of prevention and prevention, and timely clean up the stubble after the order of vegetables, bury the soil at high temperatures, plow the soil, build irrigation water, apply lime, lime nitrogen, cotton, Rong Bao and other disinfection; Crop rice rotation or onions and garlic rotation, etc., to improve the soil, kill soil pests and diseases; comprehensive use of insecticidal lamps, insect sex attractants, insect nets, swatches and other biophysical measures to control the diamondback moth, Spodoptera litura, yellow Fleas and other pests harm. At the same time, we must pay attention to rational drug use, safe drug use, and prohibit the use of highly toxic and high-residue pesticides. We must ensure safe intervals and ensure the quality and safety of vegetable products.
In addition, for the vegetables that are in the replanting period, it is recommended to use soil treatment agents such as cotton wool, Zhuangbobo, etc. after the vegetable is removed to disinfect the soil to kill root-knot nematodes and harmful bacteria in the soil. After the soil is disinfected, biological bacterial fertilizers are applied to the soil in a timely manner. For example, on the morning of the farm, the speed of agriculture is changed on the 2nd, and the amount of mu is 2 barrels (8 kg/barrel). If it is Dingmiao transplanting, it is recommended to use cultivated rice Nonggengwangwang 300 ~ 500 times liquid smashing plate, root strong seedlings, and control of nematodes.
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