RESUMO
A field experiment was conducted in paddy having high soil available P vertisols under K.C. Canal ayacut at Regional Agricultural Research Station, Nandyal, Andhra Pradesh. The correlation studies revealed that there exist a positive strong correlation between agronomic characters at different stages with the yield. pH and EC was positively correlate with yield except pH at panicle initiation stage is non significantly correlate with yield. The available nitrogen at tillering (r= 0.446), panicle initiation (r= 0.299) and harvest stages (r= 0.502) showed nonsignificant results with yield. The soil available phosphorus at tillering (r=0.782) and panicle initiation stages (r= 0.743) showed positive and significant correlation at 1 per cent level of significance, but available phosphorus at harvest stage (r= 0.683) showed positive and significant correlation at 5 per cent level of significance. The yield of paddy is positively and significantly correlated with nitrogen uptake in straw (r= 0.812), phosphorus uptake in grain (r= 0.946), straw (r= 0.860) and potassium uptake in straw (r= 0.725) showed positive and significant correlation with yield at 1 per cent level of significance.
RESUMO
Significant differences were observed among thirty seven genotypes for all the traits studied. High genetic coefficient of variation was recorded for days to 50 per cent flowering. High heritability of 97.33 per cent was observed for pod yield per plant. High heritability and high genetic advance as percent of mean was recorded for plant height, haulms yield per plant, pod yield per plant and kernel yield per plant. These characters could be further improved through single plant selection. Moderate heritability and high Genetic advance as per cent of mean was observed for number of primary branches per plant, number of secondary branches per plant, number of mature pods per plant and 100 pod weight indicating the importance of both additive and non additive gene action in the inheritance of these characters.