广播电视英语短句 第 335 课：有机盖土-3

As the mulch breaks down, it provides material that keeps the soil from getting hard. 盖土分解过程中，提供了保持土壤不会变硬的材料，

This improves the growth of roots and increases the movement of water through the soil. 这样就改进了根系生长条件。增强了水在土壤中的流动性。

The mulch also improves the ability of the soil to hold moisture.
这样的盖土也改善了土壤保持潮湿的能力。

Experts generally suggest laying mulch to a depth of about ten centimeters. 专家们通常建议，盖土的覆盖厚度为十厘米。

If finer materials are used, such as cut grass, the depth should be two and a half to seven and a half centimeters. 若使用更好的材料，如切碎的草料等，则其厚度宜为二到七个半厘米。