原因是，肥沃的火山土壤使这片土地极适于农业。
The reason is that rich volcanic soil makes the land fantastic for farming.
荒漠化这一形式的土地退化，使肥沃的土地变成了沙漠。
Desertification, is a form of land degradation, by which fertile land becomes desert.
农民们能够使他们的土地肥沃的最好办法之一，就是在土壤中加施氮肥。
One of the best ways farmers can make their land richer is to add nitrogen to the soil.
小麦收割完成后，农夫们把剩余物烧掉，然后用犁把灰埋入地里，使土地更肥沃。
After the wheat crop has been gathered, many farmers burn the remains and plough the ash into the soil, so as to enrich it.
那里的人们正在热情高涨地着手植树造林、收回土地，使它变得肥沃。
There the local people are vigorously setting about the task of planting trees to reclaim the land and make it fertile.
那里的人们正在热情高涨地着手植树造林、收回土地，使它变得肥沃。
There the local people are vigorously setting about the task of planting trees to reclaim the land and make it fertile.
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