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发表于 2011-12-11 10:50
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本帖最后由 sdjgyt12 于 2011-12-11 11:07 编辑
hw
New agricultural methods and technology increased food production in many countries during the green revolution.Cropland increased by 12 percent from1961-2009,yet production grew by 115 percent. But the new report warns that production rates have been slowing in many areas. In too many places it says practices that have increased production have also harmed the land and water.It calls for greater use of way that can expand production while limiting damage to ecosystems.One such practice might be the use of "fertilizer trees".There are fast-growing trees and shrubs whose leave and roots help improve soil. A recent study found that about 400,000 farmers in southern Africa are using them. |
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