Studies on the establishment and nitrogenase activity of inoculated cyanobacteria in the field and their effect on yield of rice

摘要

Selected species of cyanobacteria isolated from the rice fields of Orissa state were cultivated in galvanized iron trays and polybags under outdoor conditions for producing inoculum for field application. Nitrogenase activity of the soils inoculatedwith cyanobacteria was higher than the control and nitrogenous fertilizer supplemented plots. Most of the inoculated species competed successfully with the indigenous flora and established in the fields contributing higher amount of fixed N to the soils.Increase in grain yield by over 25 percent than control was obtained in plots inoculated with fresh cyanobacterial inoculum containing regional isolates. This was much higher than the yield obtained with the soil based culture.