00588nam a2200169Ia 4500 CTU_168057 210402s9999 xx 000 0 und d 338.1 L912 Low-input sustainable crop production systems in Asia: Proceedings of the First Asian Crop Science Conference (September 24-28, 1992 Seoul, Korea) Seoul Korean Society of Crop Science 1993 Agriculture,Kinh tế nông nghiệp Economics aspect Trung tâm Học liệu Trường Đại học Cần Thơ