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These terms define your current search. Click the × to remove a term. Economics, Business and Industry: economics > economic systems × 73 items, grouped by Taxa - Plantae (view ungrouped items) Magnoliophyta (2)    (Click to View) Agronomic productivity and nitrogen requirements of alternative tillage and crop establishment systems for improved weed control in direct-seeded rice Field crops research (Click to View) Cassava: constraints to production and the transfer of biotechnology to African laboratories Plant cell reports