Classification and uses of agricultural film?

According to the functions and uses of agricultural films, they can be divided into two categories: ordinary agricultural films and special agricultural films. Ordinary agricultural films include broad-spectrum agricultural films and micro-thin agricultural films; special agricultural films include black agricultural films, black and white double-sided agricultural films, silver and black double-sided agricultural films, green agricultural films, microporous agricultural films, incision agricultural films, and silver gray (to avoid aphids) Agricultural film, chemical) Weeding agricultural film, color matching agricultural film, controllable degradable agricultural film, floating film, etc.

1 Broad-spectrum agricultural film is mostly blown from high-pressure polyethylene resin. The thickness is 0.0 1 2 0.016 mm. It has good transparency, strong warming and moisture retention properties, and is suitable for various areas, various covering methods, various cultivated crops, and various stubbles. The theoretical dosage per mu of vegetable field is about 7 8 kilograms.

2 Micro-thin agricultural film is translucent, with a thickness of 0.006 to 0.10 mm. The temperature increasing and moisture retaining properties are close to those of broad spectrum membranes. However, due to the thinning of the thickness, the strength is reduced, and the light transmittance is not as good as that of the broad-spectrum agricultural film. It is generally not suitable for use in agricultural film furrows, high furrow planting, high ridge and furrow planting, sunny slope ridge and furrow planting, flat borders close to the ground, and small agricultural films. Cover cultivation methods such as arch sheds. Approximately 4 5 kilograms are used per acre of vegetable field.

3 The black agricultural film base resin is blown by adding a certain proportion of carbon black. Thickness is 0.015 0.025 mm. The warming performance is not as good as that of broad-spectrum mulching film, and the moisture-retaining performance is better than that of broad-spectrum agricultural film. The black agricultural film can block sunlight, making it difficult for weeds under the film to photosynthesize and grow, and has the function of limiting weeds. It is suitable for ground cover or softening cultivation in areas and seasons with heavy weed damage and low requirements for warming effects. The dosage per mu of vegetable fields is about 7.4 to 12.3 kilograms.

4 Black double-sided agricultural film, one side is milky white and the other side is black. When used, the black surface sticks to the ground to increase light reflection and photosynthetic intensity of the middle and lower functional leaves of the crop, reduce ground temperature, conserve moisture, and eliminate weeds. It is suitable for cover cultivation in high-temperature seasons. The thickness is 0.025-0.4 mm, and the dosage per mu of vegetable field is about 12.3-19.8 kg.

5 Silver and black double-sided agricultural film. When using, the silver-gray side faces up. This kind of agricultural film can not only reflect visible light, but also reflect infrared and ultraviolet rays. It has stronger cooling and moisture conservation functions. It also has strong functions of repelling aphids and preventing viruses. It also promotes the interaction of anthocyanins and vitamin C. effect. Suitable for ground cover cultivation in summer and autumn. The thickness is 0.03-0.05 mm, and the dosage per mu of vegetable field is about 14.8-24.7 kg.

6 Green agricultural film This agricultural film can prevent the visible light necessary for green plants from passing through. It has the functions of weeding and inhibiting the increase in ground temperature. It is suitable for cover cultivation in summer and autumn. The thickness is 0.015-0.02 mm, and the dosage per mu of vegetable field is 7.4-9.9 kg.

7 Microporous agricultural film There are more than 2,500 micropores per square meter of agricultural film. These micropores are closed by the condensed water on the lower surface of the agricultural film at night, preventing air and heat exchange between the soil and the atmosphere, and have thermal insulation properties; during the day, they absorb solar radiation and increase the temperature, the condensed water on the film surface evaporates, the micropores open, and the soil and the The exchange of air and heat between the atmosphere avoids the accumulation of carbon dioxide in the rhizosphere due to agricultural film covering, inhibiting root respiration and affecting yields. The warming and moisturizing properties of this kind of agricultural film are not as good as ordinary agricultural films, and it is suitable for use in warm and humid areas.

8 Incision agricultural film Cut the agricultural film into strip-shaped incisions according to certain specifications. The advantage of this kind of agricultural film is that after the seedlings are unearthed, they can naturally grow out of the incisions of the agricultural film. There will be no roasting of the seedlings and no carbon dioxide accumulation in the rhizosphere of the crop. However, its performance in increasing temperature and retaining moisture is not as good as that of ordinary agricultural film. It can be used for film-covered cultivation of broadcast and drill vegetables.

9 Silver gray (aphid avoidance) mulch film Aphids have a strong counter-taxis to silver-gray light, and winged aphids will fly away when they see the silver-gray light. The silver gray (aphid-repellent) film takes advantage of this habit of aphids and uses a spraying process to compound a layer of aluminum foil on the surface of the agricultural film to repel aphids and prevent the occurrence and spread of viral diseases. The thickness of this agricultural film is generally 0.015-0.02 mm, and can be used for cover cultivation of various summer and autumn vegetables.

10. Chemistry) When covering the weeding agricultural film, place the side containing the herbicide on the ground. When the gasified water evaporated from the soil condenses into water droplets on the lower surface of the film, the herbicide is dissolved in the water and dripped into the film. On the soil surface, a grass-killing soil layer is formed. This kind of agricultural film has three functions of increasing temperature, preserving moisture and killing weeds.

11 Color-matched agricultural film is a special agricultural film developed based on the thermotaxis of vegetable crop roots.

It is usually black and white, with white film tapes in the cultivation rows and a black film tape between the rows. In this way, the white film tape has a good warming effect, which can promote early growth and rapid growth of crops in the early growth period. Although the black film tape has a poor warming effect, it basically does not affect the early maturity of vegetables because it is far away from the crop rhizosphere, and has a weeding function. . Entering the high-temperature season, the ground temperature between rows can be lowered, inducing roots to grow between rows, which can prevent premature aging of crops.

12 Controlled degradable agricultural film This type of agricultural film can degrade by itself over a period of time after being covered. Prevent residues from contaminating the soil. At present, my country's research and development of controllable degradable agricultural films has reached the international advanced level. The induction period of degraded agricultural film can be stably controlled at more than 60 days; the degraded film does not hinder the elongation and growth of crop roots and does not affect soil water movement.

13 Floating Film This is a special agricultural film used as a sky film to cover vegetable crops directly. A large number of small holes are evenly distributed on the membrane to facilitate the exchange of water, air and heat inside and outside the membrane, and to achieve natural regulation of temperature, humidity and gas within the membrane. This not only protects against low temperatures and frost, promotes crop growth, but also prevents seedlings from burning due to high temperatures, which cannot prevent the spread of diseases caused by excessive humidity.