某种非常有效的除草剂对玉米来说是安全的，但即使是除草剂的残留物也会对大豆造成损害，该残留物在施用除草剂一年多后仍残留在土壤中。
One very effective herbicide is safe for corn, but soybeans are damaged even by the herbicide's residue, which remains in the soil more than a year after the herbicide is applied.
农民可以将玉米和其他作物的残留物留在土壤表层。
Farmers may keep the remains of maize or other crops on top of the soil.
保留在土壤中的全部水分对植物的有效性是不一致的。
All the water retained in a soil is not equally available to plants.
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