. . "Agricultural research." . . "Agricultural extension." . . . . . "Three case studies; Mechanisms linking on-farm research and extension; General lessons." . . . . "Linkages Between On-Farm Research and Extension in Nine Countries" . . . . . . . . . . . . . . . "Linkages between on-farm research and extension in nine countries" . "Linkages between on-farm research and extension in nine countries"@en . .