In summer, vegetables are grown in the sheds, and shade nets and insect nets are indispensable. The shade nets should be installed on the wire 2 meters above the ground in the shed, and the insect nets should be installed 50 centimeters high on both sides of the arch. The application of the two networks has played a positive and effective role in reducing the temperature in the shed and preventing the invasion of pests.
There are two points that should be noticed in the use of shade nets for shade nets in greenhouses in the summer: First, shading nets should be installed inside the arches, instead of covering the outside of the cover film like a greenhouse. Practice has proved that installing the shade net in the arch can make the air convection better, the cooling effect is better, and it is easy to operate. The second is to choose shade nets of different colors according to the types of vegetables. Shade nets are available in black, white and silver grey. Black shading nets are suitable for vegetables with weak light requirements. White shading nets are suitable for light-loving vegetables. Silver-gray shading nets have the effect of avoiding and preventing diseases. In addition, the black shading nets are covered at noon on sunny days, and will be promptly removed in the morning, evening and on cloudy days. Sunny days generally cover from 9 a.m. and get lifted at 3 p.m.
Insect net insect net can both shade, but also pest control, can be used throughout the year. The use of insect nets should pay attention: First, cover all the vegetables during the growing period. Insect nets have a low shading rate and should be covered throughout the entire period, giving no opportunity for pests to invade. After the installation of the insect nets, bricks or soil blocks are pressed on both sides of the insect nets, and the nets need to be firmly clamped with a press wire to prevent blowing by the wind. Second, select the appropriate specifications. Insect network specifications include amplitude, aperture, wire diameter, color, etc. In particular, the aperture is generally calculated based on the number of meshes. The number of meshes is too small and the mesh size is too large to achieve the desired pest control effect. The mesh number is too small and the mesh size is small, but the pest control effect is good but the cost increases. The current number of meshes recommended for production is 24-40 mesh. Third, pest control must be combined with chemical control. Some vegetable farmers believe that spending money to buy pest control nets and prevent pests are no worries. Actually, pest control nets can only prevent pests from intruding. If there are insect pests in the shed, it is still necessary to carry out chemical control.
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