笔者应美国国家科学院的邀请,于1984年春到美国访问了两个多月,访问期间的主要活动,是在Illinois大学,Louisiana州立大学,Purdue大学和Pennsylvania州立大学讲学,讲学的主要内容是电化学方法在土壤学研究中的应用和渍水土壤的物理化学。在这期间,也会见了一些美国土壤学者,参观了一些研究室。我所接触的学者,主要是土壤化学,其次是 At the invitation of the National Academy of Sciences, the author visited the United States in the spring of 1984 for more than two months. During his visit, the author mainly gave lectures at Illinois University, Louisiana State University, Purdue University and Pennsylvania State University. The lectures mainly focused on electrochemical Application of Methods in Soil Science and Physical Chemistry of Soil Waterlogging. During this period, some American soil scientists were also met and visited some laboratories. The scholars I contacted were mainly soil chemistry, followed by