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Sweet Potatoes, One of the Oldest Vegetables, Part 2
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They resist wind. And they do not need very much water. They grow well even without growth chemicals or fertilizer. And they produce many times more food than some traditional crops. One piece of land...
它们抗风。
而且他们不需要太多的水。
即使没有生长化学品或肥料,它们也能生长良好。
它们生产的食物是一些传统作物的许多倍。
一块土地可以生产特定数量的水稻。
但同一块土地的红薯产量是大米的六倍!同样,专家说,一公顷红薯比一公顷谷物能养活更多...
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