The vegetable "two membranes, one net and one yellow plate" refers to the greenhouse film, mulch film, insect net and yellow stick board. The two membranes, one net and one yellow panel cooperate with each other to supplement each other and minimize the impact of high temperature, low temperature, high humidity, diseases and insects on the growth of vegetables, and create a more suitable growth environment for the cultivation of facilities vegetables. It reduces the investment in water, fertilizer, and pesticide costs, improves the quality of vegetables, and increases the yield and benefits of vegetables.
One or two membranes
1. Shelf film. The length and width of the membrane are determined according to the frame area of ​​its shed. The shed membrane is divided into three parts, the middle is the main membrane, and the upper and lower ones are secondary membranes. The secondary membrane can be opened at any time for ventilation to adjust the temperature in the shed.
2. Plastic film. That is, a mulch film is covered between the ridges in the shed. Place drip irrigation pipe before laying the film. Using drip fertigation technology under the membrane, the fertilizer is formulated into fertilizer solution and transported to the vegetable root soil. This will not only help to accurately control the amount of irrigation and fertilization, but also significantly increase the utilization rate of water and fertilizer, and also reduce the labor intensity of irrigation and fertilization. When laying the film, care must be taken to stretch and stretch the film, which can effectively inhibit weed growth.
Second, a network
Put the insect net on the top of the film before putting it on the membrane so that it can hold the net. The number of insect nets is 30-40 mesh, and the width is generally about 1.5 meters. This will not only prevent the entry of locusts, moths and bollworms, but also maintain indoor ventilation. Especially in summer and autumn, the high temperature of vegetable pests can be achieved. Pests are not allowed outside the network, which greatly reduces the harm of pests.
Third, a yellow board
Yellow-plate physical trapping was performed on the tropism of yellow by aphids, whitefly, and Liriomyza sativae. The size of the yellow plate is 30 centimeters and 40 centimeters in size and can be hung up when the plants are colonized. The effective area of ​​a yellow plate is 20 square meters, and 20-30 yellow plates are suspended in a greenhouse covering an area of ​​1 mu to meet the demand. Yellow plates are to be hung in the middle of each ridge and suspended every 3 meters along the east-west direction. The yellow plate suspension height should be maintained at a distance of about 20 cm from the top growth point of the plant, which means that the height of the suspension should be adjusted upwards with the growth of the vegetables so that good control effects can be obtained.
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