Summer light, high temperature, storms, and pests are serious. There are many pests, low yields, and poor quality of vegetables. Many vegetable varieties cannot be produced, and two nets and one membrane (plastic film, insect net, and shade net) technology are used. To shading, cooling, shelter from rain, pest control and other effects will help improve the yield and quality of summer vegetables. First, production advantages 1, cost-effectiveness: Although a one-time investment is larger, but the service life is long, generally can be used continuously for 3-5 years, more than one application, low depreciation cost, reduced medication, watering, fertilizing, etc. cost. 2, to improve the environment, reduce the impact of disastrous climate: If sunny days in the summer, bare soil surface temperature up to 45-50 °C, the depth of 10 cm above the soil surface often rises above 35 °C, and the most suitable soil temperature for vegetables in general Not more than 30 °C. After adopting two-mesh and one-membrane technology, the temperature of the soil surface in the noon can be reduced by 5-7°C at noon, and it can drop by 8-12°C in the hot noon. The film can prevent direct impact of rainstorm on the ten-meter, resulting in the occurrence of soil compaction, root suffocation and dead seedlings; at the same time, it also protects the air, regulates air humidity, prevents drought, improves the rhizosphere environment, and promotes germination and seedling growth. 3. Prevent pests and disease prevention: Use two nets and one membrane for enclosed sheds to cover nursery or cultivation, so that pests can not enter the shed, and eliminate the occurrence of pests from the source; the application of plastic film can prevent vegetables from rain erosion and reduce diseases. The occurrence of the vegetables provides good light, temperature and gas conditions for the growth of vegetables. 4, increase production and increase income: The test results show that the application of two nets and one membrane technology can generally increase production by 20% -50%, but also to make early cauliflower, early cabbage, early cabbage and other early autumn vegetables listed 10-30 days in advance. It is particularly necessary to point out that the application of two-mesh and one-membrane technology in summer seedlings of vegetables can significantly increase the seedling rate and quality of seedlings. 5, improve product quality: can effectively reduce the amount of pesticides used to reduce pesticide residue pollution; reduce crude fiber content, improve the quality of vegetables; appearance of fresh quality, will help improve product performance. Second, the use of the studio 1, can use the existing solar greenhouse, but the back wall must have vents. 2. The greenhouse vegetable production area can use existing spring greenhouses. 3, build a dedicated greenhouse. The special shed should be built in the east-west direction, with a span of 10-15 meters, a length of 50 meters or more, a height of 2.5-3 meters, and an area of ​​about 1 mu. Third, pay attention to matters 1, must start from the sowing seedlings on the use of two-membrane technology. 2, to form a completely closed system. The interface between the plastic film and the insect net should be overlapped by 20-30 cm. The bottom of the insect net should be buried in the soil. Avoid gaps between membranes, nets, nets, and the ground. 3. Pay attention to the management after the shade net is covered. When the sunshade net covers, it must be straightened, stretched, leveled, covered in a timely manner, and should not be covered in the end. According to the weather changes and plant growth conditions, flexible covering methods should be adopted to achieve uncovering and combining. Generally, sunny days should cover the shade net from 10 am to 4 pm, and shade nets should be removed on cloudy days. The application time of shade nets is from June to August. Fast-growing leafy crops are mainly covered by pre-growth. 4, species selection. Should use strong resistance, heat and disease resistance, high yield, the potential for growth and rapid growth of varieties.
Cas 330785-83-6,Avanafil Intermediates,3-Chloro-4-Methoxyphenyl
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