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8 Topic Pages Found in Agriculture, Aquaculture & Food Sciences and starting with the letter R
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Refuse and refuse disposal

Material, substance, or by-product discarded as being no longer useful. Waste is usually classified according to the source that produces it. Examples

Open resources

Materials that can be used to satisfy human needs. Because human needs are varied and extend from basic physical requirements, such as food and

Open rice

cereal grain (Oryza sativa) of the grass family (Graminae), probably native to the deltas of the great Asian rivers—the Ganges, the Chang (Yangtze),


common name for some members of the Rosaceae, a large family of herbs, shrubs, and trees distributed over most of the earth, and for plants of the

Open rubber

any solid substance that upon vulcanization becomes elastic; the term includes natural rubber ( caoutchouc ) and synthetic rubber. The term elastomer


common name for various members of the family Rutaceae, a large group of plants distributed throughout temperate and tropical regions and most

Open Rutabaga

This root-like member of the cabbage family is widely grown in the cooler parts of temperate zones around the world. Also called Swede, Swedish or


The hardy rye plant grows well in damp climates and temperatures close to freezing, so it is a favorite crop of Russia, Eastern Europe, the UK,