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The use of improved upland rice ( Oryza  spp.) cultivars would be an alternative approach for improving rice production in Indonesia. The objectives of study were to identify cultivars with high yield potential and to determine its related traits. Five improved upland rice cultivars, namely Inpago 8, Inpago 9, Inpago 10, Inpago 11 and Inpago 12, released in 2011 to 2017 were observed under farmer’s field condition in Lebak district, Banten Province, Indonesia from September 2018 to January 2019. Grain yield, yield components, and biomass production and partitioning were measured at maturity stage. Grain yield of five cultivars showed higher performance than regional average yield performance. Grain yield performance was closely correlated with panicle number per m 2 . The Inpago 9 and Inpago 12 were greater in grain yield due to greater number of panicle as compared to other cultivars. Superior performance of Inpago 9 and Inpago 12 were also due to greater biomass production and better harvest index (HI). On the other side, smaller value of panicle number per m 2  and HI of Inpago 11 resulted in lower performance in grain yield. In conclusion, panicle number, biomass production, and partitioning were some good traits in selecting adaptive cultivars. In addition, cultivars Inpago 9 and Inpago 12 are considerable to be chosen by the farmers in Lebak district, Banten Province to improve upland rice production.

Performance of improved upland rice cultivars under farmer’s field condition in Banten province, Indonesia