In summer, vegetables are grown in the sheds, and shade nets and insect nets are indispensable. The shade nets shall be installed on wire 2 meters above the ground in the arch, and the insect nets shall 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.
Shade net arch greenhouse vegetables in the summer use shade net should pay attention to two points: First, the shade net is best installed in the arch shed, not like the greenhouse as the cover outside the film. 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. At present, the recommended insect-proof nets for production are 24 to 40 mesh. Third, pest control must be combined with chemical control. Some farmers believe that if you spend money on pest control nets, you do not have to worry about pest control. Actually, pest control nets can only prevent pests from intruding. If there are insect pests in the shed, you still have to carry out chemical control.
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