Preventing plastic film pollution

The use of plastic film has become an important means to ensure high agricultural yields and stable production. However, the residual film recovery rate is low, the amount of residual film in the soil is gradually increased, and it is very easy to cause plastic film pollution. Plastics are neither attacked by microorganisms nor self-decomposed. The degradation cycle is generally 200 to 300 years, and toxic substances are also dissolved during the degradation process. According to statistics, the annual residue of agricultural film in China is as high as 300,000 tons, and the residual film rate is more than 40%, which is undoubtedly a great hidden danger.

One is the harm to the soil environment. Soil infiltration is the phenomenon of water moving deeper into the soil due to free gravity. Due to the change of residual film debris in soil or the continuity of the cut off soil pores, gravity water will have a greater resistance when moving, and the gravity water will move downwards slowly, so that the amount of moisture permeation will decrease due to the increase of residual plastic film, and the soil moisture content. The decline has weakened the ability of the arable land to resist drought. Even groundwater can hardly infiltrate, causing serious consequences such as secondary salinization of the soil. In addition, the residual agricultural film is difficult to decompose under natural conditions, affecting the permeability of the soil, hindering the migration of soil water and fertilizer, reducing the level of soil fertility, resulting in reduced crop yields.

The second is the damage to crops. As the residual film affects and destroys the physical and chemical properties of the soil, it will inevitably cause difficulties in the growth and development of the crop roots. Any soil with residual film prevents the root system from colluding and affects the normal absorption of water and nutrients. When fertilizing between crop plants, large pieces of residual membranes separate the fertilizer, affecting the fertilizer efficiency, resulting in a decline in yield.

The third is the impact on the rural landscape. Due to the limitations of recycling the residual film, and the incompleteness of the method of recycling the residual film, the method was not properly performed. Some of the residual film was removed from the fields and the land. After the strong wind was blown, the residual film was blown to the front of the house and the field. Treetops affect the rural environment and landscape, causing "visual pollution."

The fourth is the harm to livestock. The residual film of the ground outcrops and forage were collected together. After the cows and sheep had eaten the residual film, the esophagus blocked the digestion and even died.

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