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Q1: Is the number of stitches the purchase standard for shade net?

Answer 1: When purchasing, you should first confirm whether it is a round wire sunscreen or a flat wire sunscreen. The wire of the round wire sunscreen is like a fish line, and the flat wire is in sheet shape.

Ordinary flat wire sunshade net can be purchased according to the number of stitches and shading rate. For example, for the same three needle sunshade, the density of 50% sunshade and 70% sunshade is different. As for the sunshade net with 70% sunshade rate, if 3 needles are compared with 6 needles, 6 needles will appear denser. Therefore, the number of stitches and shading rate should be combined when purchasing.

Generally, the round wire sunshade mesh is mostly 6 pins, which only needs to be selected according to the shading rate. Other aluminum foil sunshades, black-and-white sunshades, etc. are generally 6-pin, and vegetable farmers can choose according to the shading rate.

Q2: The sunshade bought on the Internet platform is marked as 3-pin. After receiving the goods, it is much thinner than the pictures, and cannot achieve the desired sunshade effect. How to avoid this problem?

A2: Generally, the cost of sunshade is composed of materials and processes. If the price of a three pin sunshade is lower than 1 yuan/square meter, it should be carefully selected. When online shopping, try to choose a reliable brand, or choose a sales channel with brand authorization, so as to ensure the quality.

Q3: What is the difference between black sunscreen and silver sunscreen, and how to use them?

A3: The black sunshade has a high sunshade rate and fast cooling, but the disadvantage is that it needs to be pulled and placed every day. It cannot be covered all day to avoid the formation of a weak light environment in the shed, which is time-consuming and laborious. The black sunshade net should be used for short-term covering on greenhouse crops that need careful management in summer.

Silver gray shading net has low shading rate, but it is convenient and can be covered all day long. It is more suitable for light loving vegetables in greenhouses and greenhouses requiring long-term coverage.

However, no matter what kind of sunscreen is used, the following two points should be paid attention to: 1. Coverage period and duration. 2. In the absence of strong light and low temperature, the sunshade cannot “sleep” on the greenhouse all the time. The light intensity and temperature required by weather conditions, crop types and different growth periods of crops shall be flexibly controlled when the sunshade net is uncovered.

When setting the sunshade net, the sunshade net can be supported to form a ventilation belt, and the sunshade and cooling effect will be better. For the external sunscreen used for support, it is also necessary to consider whether the thermal shrinkage of the sunscreen is stable. If the thermal shrinkage is not stable, it may cause damage to the bracket and the slot, or tear the sunscreen. If you are not sure whether the heat shrinkability is stable, you can try it on a small area first

In addition, if the thermal shrinkage is too large, the sun shading rate will increase after a period of use. The shading rate of the shading net is not the greater the better. If the shading rate is too high, the photosynthesis of plants will be reduced and the stems will be thin.

Q4: How to buy and use black-and-white sunscreen?

Answer 4: The black-and-white sunshade is composed of black and white sides. When covering, the white side is facing up. Compared with black, the white top surface can reflect sunlight (rather than block it), which is better than black in cooling effect. The black lower surface has the effect of shading and cooling, which increases the shading rate than the all white shading net. The pores in the middle of the net ensure the maximum ventilation rate with the outside world, and improve the oxygen supply of plants in the planting area. The sunshade made of high-strength single filament fiber yarn has high quality and long service life. It is an ideal choice for the edible fungus greenhouse, chrysanthemum and other plants that are sensitive to light.

The all white shading net, which is used more in strawberry seedling and planting, can prevent crop overgrowth. It can also be spread above the mulch film to separate strawberry fruit from the mulch film, reduce the occurrence of baked fruit, rotten fruit and gray mold, and improve the commodity rate.

Q5: Why is there a certain distance between the outer shading net and the covering materials such as the greenhouse film, so that the cooling effect is better? What is the appropriate distance?

A5: It is recommended to keep a distance of 0.5~1m between the sunshade net and the shed surface. The air between the sunshade net and the shed surface can flow, which can accelerate the heat loss in the shed. The sunshade cooling effect is better.

If the shading net is close to the greenhouse film, the heat absorbed by the shading net can easily be transferred to the greenhouse film and then to the greenhouse, and the cooling effect is poor. Close to the greenhouse film makes the heat can not be dissipated, increasing its own temperature, so it will accelerate its aging. Therefore, when using the sunscreen, be sure to keep a proper distance from the greenhouse film. You can use steel wire to support the sunshade net or sunshade cloth directly above the greenhouse. The vegetable farmers without conditions can put soil bags on the main framework of the greenhouse, and put grass curtains on the front of the greenhouse at an interval of 3~5 meters, so that the shading net does not close to the greenhouse film.