Evaluation of azotobacter vinelandii strain sriaz3 bioinoculation along with n-source on yield, yield attributes and nutrient uptake of rice (oryza sativa l.) cultivar

A field study with Rice (Oryza sativa L. cv. Pyari) was conducted in Agronomy Research Plot, OUAT, Bhubaneswar with eight (8) treatments and three (3) replications i.e. T Control, T N (50% N), T N (75% N), T N (100% N), T 1 2 1 3 2 4 3 5 A. vinelandii strain SRIAz3, T A. vinelandii strain SRIAz3 + N , T A. vinelandii strain SRIAz3 + N and T A. 6 1 7 2 8 vinelandii strain SRIAz3 + N . After harvest of the crop yield, yield attributes [as panicle length (in cm), number of 3 -1 -1 grains per panicle, test weight (in gm), grain yield (t ha ), straw yield (t ha ), grain: straw ratio, and harvest index were recorded] and nutrient analysis (concentration and uptake of N, P and K) was performed. Plots treated with T7 found to have highest grain: straw ratio as well as harvest index i.e. 0.90 and 0.47 respectively at the same time T treated plots 7 -1 were having highest yield in terms of both grain and straw i.e. 3.87 and 4.32 t ha . Again T treated plants performed 7 -1 maximum with respect to concentration (1.47% and 0.38% respectively) and uptake (56.97 and 14.73 kg ha respectively) of N and K but on a contrary maximum performance in case of P concentration (0.22) and uptake (7.92 kg -1 ha ) was found in plants treated with T . Application of PGPR and N fertilizers increased the N efficiency by increasing 8 N content and N uptake in plants which reveals the fact that balanced application of both organic and inorganic sources of nutrients in various plant available forms is unavoidable in yield improvement of crops.