The method is gaining widespread use in countries such as Niger，Burkina Faso，Malawi and Zambia.The trees are planted among maize(玉米)，millet or sorghum crops.They not only add nitrogen(氮)to the soil through their roots，but also through their leaves when they fall off and break down.At other times of the year，the trees can protect plants from strong sunlight.

　　John Reganold says he knows of one woman who has had great success with perenniation.

　　“She's a grandmother in her fifties.Her_name_is_Rhoda_Mang'yana_and_she_started_using_this_system_about_twenty_years_ago.And her yields initially were about a ton of maize.Now with a good year she gets four tons per hectare，four times what she was getting.”

　　【解题导语】　如何在非洲土地有限、地力贫瘠的情况下，有效地改善土地状况，提高农作物产量呢？本文介绍了一种能有效提高土地的肥力，促进生产的耕作方式。

　　一、阅读与积累

　　1．攻克疑难词汇

　　①additional adj.另外的，额外的

　　②perennial adj.长久的、持续的

　　③yield n．产量，产出

　　④practice n．通常做法

　　⑤organic adj.有机的

　　2.攻克疑难句

　　(1)They have been actually using farming practices where they're not putting in organic matter.

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