Vegetable greenhouse film has four taboos

Industrial film cannot be used

Membranes are generally divided into industrial membranes and agricultural membranes. In the production of vegetables, agricultural membranes must be selected. Industrial membranes must not be used, because some industrial membranes contain some toxic substances, which are harmful to crops and even cause production. Never received. The agricultural film is further divided into a transparent film, a black film, a silver gray film, etc., and different shed films are selected according to the season, the type of crop, and the purpose of covering. For example, a transparent film should be selected for the purpose of warming and moisturizing the shed; the black film should be selected for the purpose of lowering the temperature and weeding and moisturizing; the silver-gray film can be used for the anti-mite.

Avoid neglecting water management

Some people think that covering the mulch has a water-retaining effect, and it ignores the water management. In fact, water conservation is necessary to have water. Therefore, before the mulching film is covered, the moisture in the soil must be sufficient, which is the key to ensure the normal growth of the emergence and seedling stage. On the contrary, if the soil is heavy, too much water, and lack of oxygen, it is unfavorable for seed germination and root growth. Such plots should be air-dried first, and then cover the mulch when the humidity is suitable. Otherwise, the roots will be destroyed.

Avoid blindly planting mulching film in advance and sowing is not too early, because the cover film has good temperature, good sensation, and quick emergence, and it is easy to be frozen when the night cream is encountered, resulting in destructive seedlings. It is necessary to consider three factors in determining the sowing date: The requirements of the conditions; the second is the local final frost period: the third is the number of days from sowing to emergence. In the case that all three conditions are suitable, it is better to produce the seedlings after the final frosting period before the final frosting period, which is beneficial to increase production and income.

Avoid blind application of fertilizer

In order to increase production, some vegetable farmers blindly increase the amount of fertilizer applied, especially when planting or applying at the same time, which not only causes waste, increases costs, and even destroys seedlings. Some vegetable farmers believe that the film can increase production, the amount of agricultural fertilizer is small, and the amount of chemical fertilizer is also insufficient, resulting in later de-fertilization and affecting yield. When applying the base fertilizer, whether it is organic fertilizer or chemical fertilizer, it must be fully fertilized, and it should be deepened by 20 to 30 centimeters and thoroughly mixed with the soil to prevent shallow application in the topsoil. The amount of fertilizer used should be accurate, not too much, and the applied organic fertilizer should be fully decomposed.

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