Four taboos for vegetable greenhouse filming

Cannot choose industrial film

The film is broadly divided into industrial film and agricultural film. In the production of vegetables, agricultural film must be selected. Industrial film must not be used because some industrial films contain some toxic substances, which harm the crops and even cause crop failure. Never. The agricultural film is divided into transparent film, black film, silver-gray film, etc. According to the season, crop type and covering purpose, different shed films are selected. Such as greenhouse vegetables for the purpose of heating and moisturizing should choose a transparent film; for ground temperature, weeding and moisturizing for the purpose of choosing a black film; anti-aphids can use silver gray film.

Avoid neglecting water management

Some people think that mulching film has the function of water retention, so water management is ignored. In fact, water retention should be water. Therefore, before covering with plastic film, the water in the soil must be sufficient, which is the key to ensure the normal growth of the emergence and seedling stage. Conversely, if the soil is thick, too much water, and lack of oxygen, it is not good for seed germination and root growth. Such a plot should be air-conditioned first, and cover with plastic film when the humidity is suitable, otherwise the roots will be destroyed easily.

Avoid blind sowing in advance. Plastic film mulching cannot be premature, because the cover film has good ground temperature, good moisture, and rapid emergence. It is susceptible to freezing due to late frost, which will cause seedling destruction. To determine the sowing date, three factors must be considered: First, the seedlings must protect the environment. The requirements of the conditions; the second is the local final frost period; the third is the number of days from sowing to emergence. When all three conditions are suitable, it is best to germinate before the final frost period sowing after the last frost period, so as to help increase yield and income.

Avoid blindly applying fertilizer

Some vegetable farmers blindly increase the amount of fertilizer applied in order to achieve high yields, especially when the seeds are applied at the same time or strips, which not only causes waste, increases costs, or even destroys seedlings. Some vegetable farmers also believe that mulching film can increase yield, use less fertilizer, and use less chemical fertilizer, resulting in later de-fertilization and affecting yield. When applying the bottom fertilizer, whether it is organic or chemical fertilizer, the fertilizer must be applied at the whole layer, and it must be turned deeper by 20-30 cm, and fully mixed with the soil to prevent shallow application on the top soil layer. The amount of fertilizer used must be accurate, not too much, and the applied organic fertilizer must be fully rotten.

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