Abstract
ABSTRACT Rice fields were inoculated with four isolates of Azolla pinnata R. Br. from Thailand, Bangladesh, Vietnam, and India as well as with fresh or dry blue-green algae (BGA). Increments in biomass and N yield of Azolla and BGA were compared, and their effects on rice yields and yield components were studied. Inoculation of Azolla (500 kg fresh weight/ha) 10 days after rice transplanting (DAT) and of BGA (10 kg/ha dry and 100 kg/ha fresh) 3 DAT yielded maximum biofertilizer biomass at 30 and 80 DAT, respectively. The establishment of BGA in the rice field was faster and the biomass and N yield were initially higher in the case of the fresh than in that of the dry inoculum. At the flowering stage (80 DAT), however, these parameters were similar with both inocula. Azolla isolates grew more rapidly than BGA and produced a mat on the water surface 30 DAT. The relative growth rates of the Thailand and Vietnam Azolla isolates were higher than those of the Bangladesh and Indian isolates. Significant increase...
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