Obviously, these results underline the experience of numerous upland farmers: Cultivation without safeguarding a fast and stable vegetative cover of crops inevitably leads to soil loss which means loss of productivity.

• 显然，这些结果与无数旱地农民的经验相符合：没有保证作物快速稳定的植被覆盖层的耕作无疑会造成土壤损失，进而引起生产力损失。