宁夏盐碱土改良利用考察团一行5人,于1989年5月20日至6月4日在美国西部俄勒冈、犹他、科罗拉多、加利福尼亚4州实地考察了13个教学、科研、推广和生产单位,进行了广泛的接触和交流,现将考察的收获报告于后。 Ningxia Saline-alkali soil improvement study delegation of 5 people, from May 20, 1989 to June 4 in the western United States, Oregon, Utah, Colorado, California, 4 field visits 13 teaching, research, promotion and production units, to carry out A wide range of contacts and exchanges, the inspection report will now be reported later.