Influence of Maturity Duration on Grain Yield of Rice under Direct-seeded Condition in the Tropics

Background: The optimum maturity duration for maximum grain yield of non-photosensitive rice (Oryza sativa) under direct-seeded condition in the tropics was studied. Information on such studies conducted using near-isogenic lines are lacking. Change with explained components. Methods: experiment dry zone Sri Lanka over two seasons namely and wet during 2021 2022. Non-photosensitive that varying from 80 to 120 days but 94.0% genetic uniformity were used as simple treatments study. Pre-germinated seeds isogenic experimental plots. Result: most appropriate relationship between cubic falling within 105 111 both tropical climate. Number panicles/m2 number spikelets/panicle influenced change duration.