Farmers who are engaged in greenhouse cultivation will use the mulch film. Now there are many mulch films on the market. Many growers don't know how to choose. There are several kinds of mulch films on the market. The following small series will introduce the frequently used ones. Black mulch and an overview of other color mulch films. Black mulch use Nowadays, many growers basically use black mulch, so why use black mulch? When do you use black mulch? When can't you use black mulch? In fact, many growers use black mulch all year round, which is not true. From spring to autumn, the black mulch is used mainly to prevent the growth of weeds. However, after the winter, the temperature in the greenhouse is relatively low. In order to enhance the photosynthesis of the leaves, the insulation effect inside the greenhouse is increased. Because there are sometimes cloudy days in winter, there are also many places in the north where smog has appeared, and photosynthesis is relatively poor. Therefore, it is recommended that you use a two-color mulch film in the autumn and winter. One side is silver and the other side is black. When we use it, the silver side is black and downward. This can prevent weeds on the one hand and silver on the other. Reflective increases the photosynthesis of the crop, so be sure to pay attention when using the mulch film, especially in the winter, it is not recommended to use pure black mulch unless the local light is very sufficient. For example, if you are in North China such as Henan, Shandong, and Hebei, try to use a two-color mulch. Other color points of the mulch film 1, ordinary mulch Covering with common mulch film can improve the ground temperature, protect the roots, protect the roots and improve the fertilizer efficiency. Of course, there is also a certain photosynthesis, and it also has a reflective effect, which can improve the light receiving conditions of the lower and middle leaves of the plant. It is more suitable for spring and autumn. Used in two seasons. 2, black agricultural film The thickness ranges from 0.015 to 0.02 mm. The black agricultural film has low light transmittance, so it can prevent evaporation of soil moisture and weeds all the time, but its warming is slower than that of the transparent film. Covering black agricultural film can significantly reduce ground temperature, inhibit weeds and maintain soil moisture. Generally suitable for weedy plots and vegetables grown in the hot season, such as summer radish, cabbage, spinach, autumn cucumber, late tomato, orchard. It is especially suitable for high temperature cultivation in summer and autumn, which can provide a good growth and development condition for crop root growth and increase its yield. Nowadays, strawberry cultivation in greenhouses is basically covered with black plastic film, which not only promotes the effect of strawberry seedling growth and growth, but also makes the strawberry fruit not touch the soil and improves the product quality. 3, silver gray mulch The thickness is 0.008-0.015 mm and the width is 70-200 cm. It has a light transmittance of about 60% and can reflect ultraviolet rays. It has the functions of cooling, moisturizing and repelling mites. It can also increase the ground reflection light and facilitate fruit coloring. It also has the functions of repelling vegetables, melons and aphids and white meal, reducing damage, maintaining soil and water and weeding. It can be used in summer and autumn vegetables, melons and tobacco cultivation to prevent pests and diseases and heat resistance. Summer and autumn silver-gray mulch can be used for crops such as cucumber, watermelon, tomato, spinach, celery, lettuce, cotton, etc. It can not only prevent pests and diseases, but also improve crop quality. 4, black and white two-sided film It has the function of black plastic film covering, and also has the effect of white film surface reflection. It is a kind of film with two different colors of front and back black and white. In the process of use, generally the black face down, white upwards, mainly suitable for autumn and winter shed greenhouse vegetable cover cultivation, especially the solanes and vegetables are the best, the disadvantage is that its cost price is higher. 5, blue agricultural film This kind of mulch film is not common, mainly used for breeding and nursery. The light transmittance of blue agricultural film is lower than that of white agricultural film under the action of low light. The light transmittance is lower than that of white agricultural film under strong light, and its thermal insulation is good. In the process of breeding, not only the seedling rate is high, but also the black spot disease of cruciferous vegetables can be inhibited, the quality and yield of vegetables can be improved, and it is also suitable for rice breeding, but also for cotton, peanuts, strawberries, Potato cultivation and the like have a great effect. 6, green agricultural film Because it is green, we know that green can increase the light, thus inhibiting the growth of weeds, effectively preventing weeds and increasing yield. It is often used in the cultivation of vegetables such as kidney beans, eggplants, sweet peppers, melons, strawberries, and other cash crops. 7, red agricultural film Years of planting experiments have shown that red agricultural film has a significant effect on the growth of rice seedlings, the sugar content of sugar beet, the wide meat thickness of amaranth, and the increase of carrot yield. Because it can transmit red light, and can also block other light transmission that is not conducive to the growth of crops, it particularly meets the light demand for rice, corn, sugar beet and other crops. 8, weed film mulch This is a mulch specially designed for weeding because it adds a certain amount of herbicide to kill weeds. We know that herbicides are selective for crops. If they are wrong, they will cause phytotoxicity. Therefore, we must choose carefully. It is best to choose a special grass film according to the type of crop. Such mulch is generally used in plots with many weeds. 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