田间种树提升非洲土壤肥力撒哈拉以南的非洲地区气候温暖,光照充足,庄稼长势应该良好。但事实并非如此,这里的玉米每公顷的产量只相当于美国中西部的1/10。究其原因,是土壤营养退化得厉害,施化肥也于事无补,而且化肥会进一步损害土壤。全球8亿营养不良的人口中有1/4居住在这一地区,形势危急。恢复土壤肥力的方法——在农作物之间种植多年生的树木——开始在当地推 Planting trees in the field to enhance soil fertility in Africa In sub-Saharan Africa, the climate is warm, well-lit and crop conditions should be good. However, this is not the case. The yield of corn per hectare here is only about one-tenth of that in the Midwestern United States. The reason is that soil nutrients degenerated so badly that applying fertilizers did not help, and that fertilizers would further damage the soil. One quarter of the world’s 800 million undernourished people live in the area, and the situation is critical. Methods to restore soil fertility - Planting perennial trees between crops - Start pushing locally