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.
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