It is believed that only where sufficient moisture and nutrients are annually provided for at least two successful harvests, annual cropping systems can become sustainable on rainfed tropical uplands.
英
美
释义
我们认为,只有在起码能提供收获两茬所需水分和养分的地区,一年生的种植制度才能在雨养热带旱地持续下去。
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