Liquid film, also known as soil surface film, is a high-tech innovation developed through years of research by the Institute of Soil and Fertilizers at the Chinese Academy of Agricultural Sciences in collaboration with Beijing Yanshan Petrochemical Company. This product is essentially an emulsion created by adding special additives to asphalt, which is commonly found in everyday life. It possesses strong adhesion properties that allow it to bind soil particles together, forming stable aggregates similar to the way humus enhances soil fertility. This process significantly improves soil structure within a short time, enhancing soil permeability and making it especially effective for sandy or overly compact soils.
Experiments have shown that when the liquid film is sprayed onto the soil surface using a pressure sprayer and allowed to dry, it forms a multi-layer protective chemical film. This film not only stabilizes the topsoil but also reduces evaporation, helping the soil retain moisture for a longer period. As a result, soil water content can increase by over 20%, achieving excellent water conservation. By reducing moisture loss, the film also minimizes heat dissipation from the soil, leading to increased soil temperature. The black or brown-black color of the film further enhances its ability to absorb solar radiation, resulting in a more significant temperature rise—typically between 2°C and 4°C. In effect, applying the liquid film is like covering the soil with a thin, protective layer that boosts warmth and promotes better crop growth.
Additionally, the liquid film helps stabilize the soil, improving its resistance to erosion and reducing the risk of desertification. Compared to traditional plastic mulch, it offers several advantages. It is easy to apply: simply dilute the original solution 4 to 5 times and spray it evenly across the field using an agricultural sprayer. One person can complete the entire process efficiently without the need for labor-intensive tasks.
Another key benefit is that after the film forms, plant seedlings can naturally break through it, eliminating the need for manual film-breaking, which is often required with plastic mulch. Furthermore, once its functions of moisture retention, warming, and protection are complete, the liquid film naturally degrades and acts as a soil conditioner, continuing to improve soil quality over time.
The versatility of liquid film makes it suitable for a wide range of applications, including areas where traditional plastic mulch cannot be used, such as slopes, irregular plots, and other challenging terrains. Field tests have demonstrated that crops treated with liquid film show improved yields. For example, underground crops like peanuts, potatoes, and sweet potatoes have seen an average yield increase of about 20%. In winter wheat trials, plants exhibited stronger growth before winter, developed robust root systems, and had lower mortality rates. They also greened up and headed earlier than the control group, with a higher number of tillers and ears per mu.
Currently, the Beijing Fengrunda High-tech Development Co., Ltd. has been established to produce and promote liquid mulch, enabling large-scale commercial production. Over the past two years, the product has been tested and promoted in regions such as Heilongjiang, Shandong, Hebei, and Xinjiang, receiving positive feedback from farmers. Many local farmers have praised it, saying, “Using liquid mulch saves time and labor, doesn’t cause pollution, and increases yield—this is truly a great way to support ecological agriculture.â€
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