Effect of Azolla compost on qualitative and quantitative parameters of rice under PGPRs inoculated

In order to evaluate the effect of Azolla compost on qualitative and quantitative parameters of the rice under PGPRs inoculated, a factorial experiment in a randomized complete block design with three replications was conducted in Guilan province. Experimental Factors including Azolla compost (0, 5 and 10 ton.ha-1) and plant growth promoting bacteria (non-inoculated, Herbaspirillum, Azospirillum). The results showed that the bacterial effect on acidic and alkaline phosphatase was significant so that the Azospirillum was superiority compared to non-inoculated treatment and Herbaspirillum. The use of 10 ton.ha-1 of Azolla compost significantly increased in activity of acid phosphatase. Interaction of Azolla compost and PGPRs on tiller numbers, plant height, grains number.panicle-1, biomass and grain yield were significant. The maximum grain yield was obtained from 10 ton.ha-1 of Azolla compost Azospirillum with 7946 kg.ha-1 that compared to the control and 10 ton.ha-1 of Azolla compost had increased 31.28 and 27.47 percent, respectively. The bacterial inoculation, increased significantly phosphorous compared with non-inoculated treatment. While the maximum amount of phosphorus and potassium was observed. 10 and 5 ton.ha-1 of Azolla compost, respectively. Thus, according to the results obtained for the maximum seed yield 10 ton.ha-1 of Azolla compost as well as Azospirillum inoculation is recommended.