Studies on genetic parameters and association of yield and its components in short duration tapioca varieties (Manihot esculenta Crantz-)
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Date
1987
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Department of Plant Breeding, College of Agriculture, Vellayani
Abstract
A study was conducted at the Department of Plant Breeding, College of Agriculture, Vellayani during January to June 1986 with eight varieties of tapioca to identify suitable medium duration variety for wet land. Study of variability in the population, association among characters and determination of direct and indirect influence of different component characters on yield formed part of the objectives.
Genotypic coefficient of variation was maximum for number of branches followed by number of leaves retained at harvest and utilization index. High heritability was manifested by total number of leaves per plant, number of leaves retained at.harvest, single tuber weight and utilization index; Quality attributes registered low estimates for heritability.and genetic gain. High heritability accompanied by high genetic gain for cassava mosaic, leaf spot disease and mite attack indicate^that the feasibility of reducing the incidence of this pest and disease is remote through selection in the present varieties. At genotypic level yield showed significant positive correlation with length and girth of tuber, single tuber weight and utilization index. Sparsely branching plant type can be advantageously utilized for adopting closer spacing and thereby enhancing yield.
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