01356nam a2200217Ia 4500 CTU_228835 210402s9999 xx 000 0 und d 630.973 C734 Committee on the Role of Alternative Farming Methods in Modern Production Agriculture, Board on Agriculture, National Research Council Alternative agriculture Committee on the Role of Alternative Farming Methods in Modern Production Agriculture, Board on Agriculture, National Research Council Washington, D.C. National Academy Press 1989 Alternative Agriculture describes the increased use of these new practices and other changes in agriculture since World War II, and examines the role of federal policy in encouraging this evolution, as well as factors that are causing farmers to look for profitable, environmentally safe alternatives. Eleven case studies explore how alternative farming methods have been adopted--and with what economic results--on farms of various sizes from California to Pennsylvania. Hệ thống nông nghiệp,Agricultural systems Trường hợp nghiên cứu,Case studies Hòa Kỳ,United States dqhieu Trung tâm Học liệu Trường Đại học Cần Thơ