Comprehensive management and protection to ensure the safety of greenhouse vegetables over the summer

In summer, there are many high-temperature weather. If no effective measures are taken to reduce the temperature in the shed, vegetables are prone to problems such as vigorous growth, wilting, sunburn, falling flowers, and falling fruits under high-temperature environments. Attention should be paid to strengthening the greenhouse ventilation, water and fertilizer application, pest control and other aspects to ensure the safety of the greenhouse vegetables in summer and the summer.

Two-pronged approach to guard against sunburn of vegetables

Strengthening the wind and sunburn is serious under high temperature and strong light. Therefore, when the temperature is high during the day, the vents on the upper part of the greenhouse and the front face should be opened to strengthen ventilation to reduce the temperature in the shed. After the vent is pulled open, the pull cord of the tuyere should be fastened to prevent the wind from blowing and closing the vent after people leave, thereby causing high temperature hazards.

Covering the sunshade net The sunshade net has many functions such as covering strong light, reducing high temperature, preventing rainstorm impact, etc., and can effectively improve the growing environment of crops in high temperature seasons in summer and autumn, and avoid the damage of plants from sun exposure and sunburn. The use of shade net covering cultivation on leafy vegetables such as amaranth, celery, spring onion, etc., can be properly planted and marketed early to improve the quality of the vegetables. After sowing, it can also be covered with a floating surface. Conditional greenhouses can be covered with insect-proof nets on the entire network or around them, so that physical measures can be taken to isolate insects and reduce pest damage.

Take multiple measures to prevent harm from high temperature

Scientifically apply water and fertilizer to the greenhouse for 3 to 5 days to water once. The amount of water should not be too large each time. It is best to water the small water frequently, preferably by alternate rows or ridges. In the hot and dry mornings and nights, the vegetable fields should use micro-irrigation and micro-spray technology, which can play the role of humidification and cooling, adjust the soil water, fertilizer, gas and heat conditions, and effectively reduce the harm of drought to vegetable production. Combined with the integrated technology of fertilizer and water, it has the advantages of labor saving, labor saving, water saving, fertilizer saving, and efficiency increase, and can improve the marketability of vegetables. We should pay attention to weeding, mulching, and fertilizing in a timely manner to keep the soil of the vegetable field loose and reduce soil moisture evaporation. According to the principle of "thin fertilization and diligent application", it is generally applied in the morning or evening. Drip irrigation and topdressing are applied in conditional greenhouses. Foliar fertilizer.

To prevent and control dead trees correctly No matter it is spring or summer stubble vegetables, or any kind of dead trees caused by germs, first remove the wilting and dead plants, and at the same time disinfect the soil at the removed place to avoid spreading with water. For vegetables that are not very serious, injection treatment should be performed in time. At the same time, the application of copper complex 500 times mixed with mycotoxin 1000 times, or chlorobromoisocyanuric acid 1200 times for root irrigation, it is best to add rooting agent when rooting, strong Stimulates the regeneration of capillary roots.

Comprehensive measures to strengthen pest control

In recent years, vegetable pests such as beetle beetles, Bemisia tabaci, leaf miners, stem borers and moths have become more common in summer, and red spiders, thrips, etc. have become more harmful to cowpea and onion crops. It is necessary to adhere to the principle of prevention is more important than cure. After the vegetable is ordered, it is necessary to clean up the residual plants in a timely manner, high temperature stuffy shed, plowing the soil, irrigating the field ridge, sprinkling lime, lime nitrogen, cotton wool, Rongbao and other disinfection treatments; Rotate crops of rice and rice or rotate with onion and garlic to improve soil and kill soil-borne diseases and insect pests; comprehensively use biophysical measures such as insecticidal lamps, insect attractants, insect nets, and color plates to control Plutella xylostella, Spodoptera litura, and yellow Hazardous pests such as strip jumpers. At the same time, we must pay attention to the rational use of drugs, safe use of drugs, the use of highly toxic and high-residue pesticides is strictly prohibited, and the safety interval should be established to ensure the quality and safety of vegetable products.

In addition, for the vegetables that are in the stubble period, it is recommended to apply soil treatment agents such as cotton wool and Zhuang Bobo after the vegetable garden is removed to disinfect the soil to kill root-knot nematodes and harmful bacteria in the soil. After the soil is disinfected, apply biological bacterial fertilizer to the soil in time, such as Gengchen Nongke Quick Change No. 2 with an amount of 2 barrels per mu (4 kg/barrel). If the seedlings are transplanted, it is recommended to apply a 300-500 times solution of Gengchen Agricultural Roots Zhengwang to the roots and strengthen the seedlings to prevent nematodes.

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