Ecology, Environment and Conservation Paper

EFFECT OF PHOSPHORUS LEVELS AND PSB STRAINS ON PHYSIOLOGICAL PARAMETERS OF RICE IN NORTH EASTERN REGION, INDIA

Raghuveer M, Vishram Ram, Ipsita Kar and Santosh Kumar

Abstract

An experiment was carried out at Agricultural Research Farm of CPGS, CAU, Umiam, Meghalaya during kharif season, 2013 to study the influence of phosphorus levels and bio inoculants on growth, spectral reflectance, and yield of rice. The experiment was laid out in spilt plot design with three replications having phosphorus levels in the main plot and PSB strains in the sub plot. The maximum CGR and RGR were observed with application of 60 kg P2O5 ha-1 and the lowest in control (without P) at all the growth duration except 90-120 DAT. Maximum CGR and RGR at 30-60 DAT were observed with the combination of 60 kg P2O5 ha-1 when inoculated with Enterobacter sp. and at 60-90 DAT maximum were observed with inoculation of Bacillus polymixia which was statistically superior over other combinations. The maximum NAR was observed with application of 60 kg P2O5 ha-1 at 60-90 DAT stage. At 30-60 DAT and 90-120 DAT stage maximum NAR was observed with control treatment. The inoculation of PSB strains did not showed any significant effect on physiological parameters of rice.