Fertilizer placed in the bed under plastic mulch is protected from leaching by rainfall.When this is combined with a highly efficient drip irrigation system, fertilizer-use efficiency is maximized.

• 施在苗床中的肥料在塑料薄膜覆盖下免遭雨水的淋洗，当塑料薄膜覆盖与高效的滴灌系统相结合时，会最大限度地提高肥料利用率。