One innovative grower near the Salinas Valley of California uses plastic mulch only15 cm wide to protect drip-irrigated peppers from soil contamination.

• 加利福尼亚州萨利纳斯流域附近的一位富于创新的种植者仅用15厘米宽的塑料薄膜覆盖就使得用滴灌灌溉的甜椒免遭泥土污染。