美国农业部2007年7月13日消息，经过在贝兹维尔农业研究中心长达九年的研究后，美国农业部农业研究局的科学家们发现，有机农业种植比免耕更能对土壤组织有利。从1994年到2002年，美国科学家将浅耕的有机玉米、大豆和小麦同进行免耕并施以杀虫剂和合成肥料的相同作物进行了比较。进行三年的跟踪研究后，科学家将玉米在所有地块上进行了免耕种植，发现进行过有机农业种植的地块含有更多的碳和氮，产量比其它地块高出18%。
【原文】
ARS STUDY: ORGANIC FARMING BETTER SOIL BUILDER THAN NO-TILL
The U.S. Department of Agriculture’s Agricultural Research Service (ARS) scientists have found that organic farming builds up soil organic matter better than conventional no-till farming. Researchers made this discovery during a nine-year study at the Henry A. Wallace Beltsville Agricultural Research Center (BARC).
From 1994 to 2002, ARS plant physiologist John Teasdale compared light-tillage organic corn, soybean and wheat with the same crops grown with no-till plus pesticides and synthetic fertilizers. In a follow-up three-year study, corn was cultivated with no-till practices on all plots to see which ones had the most-productive soils. It was found that the organic plots had more carbon and nitrogen and yielded 18 percent more corn than the other plots did.
To read more, visit http://www.ars.usda.gov/News/docs.htm?docid=1261
（信息来源：农博网）
