许多年来,也许是数世纪以来,危地马拉的农民就一直在采取土壤保持措施.可是,为什么成千公顷的土地没有进行很好的土壤保持呢?为什么一些农民不向采取保持措施的人学习呢?这是不是因为保持措施太复杂呢?危地马拉的绝大多数小农由于不会读,不会写.当图片、表格或设计书摆在他们面前的时候,立即会出现智力障碍.他们知道,他们不能理解这些资料. For many years, perhaps for centuries Guatemalan farmers have been adopting soil conservation measures, but why do not thousands of hectares of land have been well soil-preserved? Why do some farmers not learn from those who adopt conservation measures? Is this because the maintenance measures are too complicated? The vast majority of Guatemalan peasants, who can not read or write because they can not read, have immediate mental retardation when pictures, forms or designs are in front of them. They know that they can not Understand these data.