Dạng tài liệu: | | Thông tin mô tả: | Precision agriculture in the 21st century : Geospatial and information technologies in crop management / Committee on Assessing Crop Yield--Site-Specific Farming, Information Systems, and Research Opportunities, Board on Agriculture, National Research Council Washington, D.C. : National Academy Press, 1997 xii, 149tr. ; 23cm
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