Characteristics: Blown film is formed by adding 2% to 3% of black masterbatch to polyethylene resin.
Advantages: Reduce ground temperature, suppress weeds, maintain soil moisture
Disadvantages: low light transmittance, slower warming, less than transparent film.
Suitable for use: It is mainly used in weedy land masses and vegetables cultivated in high temperature season (summer radish, cabbage, spinach, autumn cucumber, late tomato), especially suitable for high temperature cultivation of summer vegetables.
Second, ordinary colorless film
Features: Polyethylene (PE) or polyvinyl chloride (PVE) two kinds of raw materials blow processing, the transmittance of 80% to 94%.
Advantages: used for warming, early spring can improve the soil temperature about 3 ~ 6 °C; used for soil disinfection, the highest temperature in summer can reach 60 °C; can also protect the drought, flood, back salt, prevent soil compaction Loss of nutrients, enhance light illumination between near-ground plants and increase carbon dioxide concentration in the soil.
Disadvantages: When the film is contaminated by dust and other pollution, the light transmittance will drop to less than 50%; and weeds are prone to weeds.
Suitable for use: It is generally used for the production of eggplant vegetables and winter vegetables in early spring; in the summer, the soil is covered for high-temperature disinfection.
Three, two-color plastic film
Features: A black and white multi-functional film.
Advantages: White mulch film and black mulch film to increase temperature, keep fertilizer, reduce fertilizer, reduce pests, early maturation, increase production efficiency, etc.; make single plant nutrient space more coordinated, higher photosynthetic efficiency; is conducive to crop planting distance, standard planting Degree, reduce labor.
Suitable for: extensive.
Fourth, silver gray film
Characteristics: A layer of aluminum foil is laminated on the surface of the mulch by spraying process, and the light transmittance is about 60%.
Advantages: Can reduce temperature, keep warm, avoid aphids and whitefly, reduce the occurrence and spread of viral diseases; and can increase the ground reflection, which is conducive to fruit coloring.
Disadvantages: high cost.
Suitable for use: Suitable for pest and heat-resistant cultivation of cucumbers, watermelons, tomatoes, spinach, celery, lettuce, cotton and other crops in summer and autumn, and can also improve crop quality.
Fifth, herbicide film
Characteristics: In addition to the function of a common film, a certain amount of herbicide is added to the film.
Advantages: After 5-7 days of mulching, the water droplets condensed on the membrane release to the surface of the soil for pre-emergent weed control to achieve weed control, moisture conservation, and temperature increase.
Disadvantages: If the target crop is wrong, it is prone to injury.
Suitable for use: It is necessary to select a special mulching film according to the crop type, and do not use it blindly; generally, it is appropriate to use it in a desolate land where there are many weeds.
Sixth, other plastic film
In addition there are other colors of plastic film, such as green film, black and white two-sided film, blue film, red film, yellow film, milky film.
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With the development of the extraction and separation of the active ingredients of medicinal plants, the determination of their composition and structure, and the study of their pharmacological effects, some isolated and purified plant extracts have begun to receive attention. Some companies that produce plant extracts are actively researching and developing such new products, and some larger cosmetic companies have also carried out a lot of research work to separate and prepare pure extracts and apply them to various products. These plant extracts have high active ingredients, do not contain or less contain other irrelevant substances, contain one or several relatively pure components, the content and structure of the components are accurate, and there are clear quality standards and inspections. Methods, products have undergone pharmacological tests, clinical trials and activity tests. The use of such plant extracts is more effective and practical, and it is convenient for product preservation and quality control, but the cost is higher than that of general extracts. The following discusses some of the isolated and purified plant extracts that are used in cosmetics and whose components and structures are well understood.
Due to the influence of traditional Chinese medicine culture, my country's Plant Extract industry has unique development advantages. With abundant resource advantages and technological advantages, China has become one of the most important suppliers of plant extracts in the world.
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