Distribution pattern of coefficient of variation of some biometric characters of rice

Abstract

Coefficient of variation (CV) of grain yield from preliminary yield trial (PYT), secondary yield trial (SYT) and regional yield trial (RYT) of varietal experiment and grain yield, straw yield, panicles per square meter, tillers per square meter and plant height from fertilizer trials were included in this study. Three tests of normality were employed on original CV and CV transformed to logarithmic scale. The tests were y[b\ for skewness, Geary's 'a' for kurtosis and Shapiro-Wilk W-test of normality. It was observed that CV for grain yield of varietal trial was lower than that of fertilizer trial. Smallest CV was observed for plant height. Results obtained form the three tests revealed that for the stated biometric characters of rice, the distribution of original CV was very well to normal distribution indicating that the distribution of CV follows lognormal.