ROLE OF PRIMARY AND SECONDARY CHARACTERS TO IMPROVE YIELD POTENTIAL IN FINE RICE

Abstract

The experiment was conducted at the experiment field in Genetics and Plant Breeding Department of Hajee Mohammad Danesh Science and Technology University, Dinajpur during the period from December to June 2012. Variability, heritability, genetic advance, simple correlation and path analysis were studied for grain yield and other yield contributing charecters (i.e. plant height, No. of tiller per hill, effective tiller per hill, panicle length, grain per panicle, 10% heading days ,80% heading days, sterility %, 1000- grain weight and yield per plant) in 10 fine rice genotypes. There were significant differences observed among all the traits studied. A remarkable variation in plant characters and yield performance was noticed among the fine rice. Kalozira (4.153 t/ha) and Sadakatari (4.147 t/ha) gave the highest grain yield. While Chinigura (2.410 t/ha) and Begunbichi (2.227 t/ha) produced the minimum yield. Phenotypic variance against yield/ha (0.457) was higher than the corresponding genotypic variance (0.424). This indicated the existence of much influence of environment on the expression of the character. This character showed high genotypic (15.05) as well as phenotypic (15.63) co-efficient of variation associate with moderate heritability (61.78). On the other hand, 1000-grain weight, sterility percentage, plant height, spikeletes/panicle were highly heritable. Lodging percentage was highly influenced by environment. Selection would be effective for the characters panicle length, spikelets/panicle, effective tillers/hill and 1000-grain weight to increase the grain yield/ha as reflected by strong and positive correlation.