Correlation Studies Between Physico-Chemical, Chemical and Nutrient Uptakes of Paddy in Phosphorus Rich Vertisols.

ABSTRACT

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.