Vigor-based Classification of Traditional Pigmented Rice Cultivars in Relation to Yield Traits

Abstract

Aims: To classify the coloured rice cultivars into different vigour groups using total vigour response indices. Study Design: Randomized Block Design. Place and Duration of Study: University Research Farm, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar 736165, West Bengal, India. The geographical coordinates of the site are 26°19′86′′ N latitude and 89°23′53′′ E longitude, with an elevation of 43 meters above sea level. Experiments were conducted during Kharif 2022 and Kharif 2023. Methodology: Thirty nine coloured rice cultivars were cultivated during Kharif 2022 and Kharif 2023. The 30-days old seedlings were transplanted in randomized block design with two replications. Row to row spacing was 30 cm and plant to plant spacing was 20 cm. Standard agronomic practices compatible to the humid tropic of Terai Zone were practiced. Ten random plants from each plot were selected for recording data. Observations were recorded on yield and yield attributing parameters. Results: The statistical analysis of variance showed high significant variations among the coloured rice cultivars. Individual vigour indices, cumulative vigour response indices and then total vigour response indices were calculated and total vigour response indices were used for classification of rice cultivars in different vigour groups. Cultivars were classified into five groups- ‘very low’, ‘low’, ‘moderate’, ‘high’ and ‘very high’. Three cultivars were found to have very low vigour, five were fallen under low vigour group, 10 were under moderate vigourgroup, 17 were under high vigour group and four were under very high vigour group.