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  1. 关键资源 1987-01-01 This book is an attempt to present in a concise form basic data relating to the production and utilization of most of the root crops of economic importance to countries in the tropics. For quick reference the data are arranged under standard headings and include yield, products and their uses,...
  2. 关键资源 1985-04-01 Root crops is a general term commonly used for a wide variety of food plants that have an underground storage organ known as a root, tuber (rhizome), corm, or bulb. Root crops are rich in starch, and low in protein and oil. They are excellent sources of calories. Some are consumed as major...