Variability in relative growth rate in mulberry varieties

Three varieties of mulberry (Morus indica L.) viz. K-2, S-36 and V-1 were considered to study the variability in relative growth rate (RGR) at frequent harvests with an interval of five days starting from 30 days of pruning onwards till 75 days (final harvest) during July – August, 2001 and January – February, 2002. The study indicated that the RGR varied significantly in all the tested varieties. High and low growth phases during the growing period were also identified. Though the genotypes differ in their yield potentiality the varieties being within the same species did not vary significantly among each other with respect to RGR. No seasonal variability in RGR was noticed. The relationship between RGR and time for different mulberry varieties was also worked out.