然而，耕地被认为是对表层土壤造成严重损害的罪魁祸首，因为它清除了那些保护土壤不被吹走或冲走的植物。
However, plowing is blamed for causing severe damage to top soil by removing the plants that protect soil from being blown or washed away.
课程提供了土壤保护和灌溉管理，昆虫学，景观设计的实用知识，以及轻工机械操作和修剪园林植物技能的培养。
Courses provide a practical knowledge of soil conservation and irrigation management, entomology, landscape design, and the operation of light machinery for cultivating and pruning landscape plants.
有机物盖土保护且改善土壤状况，它为植物提供营养，它也为土壤中的蚯蚓及其它有益生物提供了很好的环境。
Organic mulch protects but also improves the condition of the soil. It provides nutrients for plants. It also provides a good environment for earthworms and other helpful organisms in the soil.
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