Some experts pointed out that this is caused by the high shading rate of the shade net used. There are two main reasons for the high shading rate: one is the problem of using the method; the other is the problem of the shading net itself. For the use of shade nets, the main points to note are as follows: First, you must choose the shade net correctly. The color of the sunshade net on the market mainly consists of black and silver gray. The black shading rate is high and the cooling effect is good, but it has a great influence on photosynthesis. It is more suitable for use on leafy vegetables, if it is on some vegetables. Use should reduce the coverage time. Although the silver-gray shade net is not as cool as black, it has little effect on the photosynthesis of vegetables, and can be used on light vegetables such as solanaceous fruits. Second, we must use the shade net correctly. The shade net covering method has two kinds of coverage and gazebo type covering. In practical application, the pavilion type cover has better effect of smoothing the air circulation and is used more. The specific method is: using the skeleton of the arch shed to cover the sunshade net at the top, leaving a 60-80 cm ventilation belt on the top. If the film is covered, the shade net cannot be directly covered on the film, and a gap of 20 cm or more should be left to cool the wind. It is understood that there are two main types of shade nets currently on the market: one is sold by weight, and the other is sold by area. The weight is generally sold as a recycled material net, which is a low-quality net. The service period is from 2 months to 1 year. The characteristics of this net are thick, the net is hard, rough, the mesh is dense, the weight is heavy, and the shading rate is generally high. Above 70%, there is no clear packaging. The net sold by the area is generally a new material net, and the service period is 3 to 5 years. The net is characterized by light weight, moderate flexibility, smooth surface and luster, and large adjustment range of shading rate, 30%-95% can be done. To. When buying a shading net, the vegetable grower must first determine how much shading rate his shed needs. In summer, under direct sunlight, the light intensity can reach 6-10 million lux. For vegetables, most vegetables have a light saturation point of 30,000-60 lux. For example, the light saturation point of pepper is 30,000 lux, and the eggplant is 40,000. Lux, the cucumber is 55,000 lux. Excessive light will have a great impact on the photosynthesis of vegetables, leading to the absorption of carbon dioxide, excessive breathing intensity, etc. The phenomenon of photosynthetic "noon break" that occurs under natural conditions is thus produced. Therefore, the use of a suitable shade ratio of the shade net cover, can reduce the temperature inside the shed before and after the noon, but also improve the photosynthetic efficiency of vegetables, killing two birds with one stone. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
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Summer sunshade nets should not be excessive, leave ventilation belts
After entering the summer, as the light becomes stronger and the temperature rises, the temperature in the shed is too high and the light is too strong, which becomes the main factor affecting the growth of vegetables. To reduce the temperature and light intensity in the shed, the shade net is the first choice. However, many vegetable farmers have reported that although the temperature has been reduced after using the shade net, the cucumber has a problem of weak growth and low yield.