美国佛罗里达州州立大学土壤化学教授袁嗣良博士于1977年7月5——16日应中国科学院的邀请来南京土壤研究所讲学。在宁期间向七个有关的科研、高校等单位的科技人员和教师作了六次学术报告,听众约一千人次。六个报告是: 1.<美国土壤学研究概况>。从土壤分类、土壤物理、土壤化学、土壤肥力、土壤微生物和土壤环境保护等方面扼要介绍了研究概况。例如,土壤水分是物理 Professor Yuan Siliang, professor of soil chemistry at Florida State University, USA, gave lectures at the Nanjing Institute of Soil Science at the invitation of Chinese Academy of Sciences on July 5 - July 1977. During the Ning period, he made six academic reports to seven scientific and technological personnel and teachers from related scientific research institutes, universities and other institutions, and listened to about 1,000 participants. Six reports are: 1. . The research overview is briefly introduced from the aspects of soil classification, soil physics, soil chemistry, soil fertility, soil microorganism and soil environmental protection. For example, soil moisture is physical