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...Issn discussion papers paper no parts i ii iii combined may farmer participatory crop improvement varietal selection and breeding methods their impact on biodiversity a case study in india plant for rice nepal this series of discussions is produced by the centre arid zone studies cazs limited distribution it includes internal briefing pre prints re articles when quoting from appropriate recognition should be made where have appeared or are to appear journals journal reference quoted university wales published shortened title j r witcombe arun joshi k d b sthapit bangor gwynedd ll uw uk krishak bharati cooperative indo british rainfed farming project kribp dahod gujarat lumle agricultural research po box pokhara accepted corresponding author publication experimental agriculture summary approaches identification improved cultivars can usefully categorised into pvs ppb various reviewed more rapid cost effective way identifying preferred if suitable choice exists impossible then resource c...