tilled soil造句

• Alluvial soil was found to be more likely to show a greater deficiency of magnesium than glacial till soils .
  冲积土比冰川土更容易呈现较严重的缺镁。
• This reduces soil degradation , as freshly tilled soils are shaded and protected from heavy rains and run - off by the trees
  它可以减少土地的退化，通过树木来保持土壤不被暴雨冲走。