Protection of rice against 'rosette long-day' disorder by inoculation with Aulosira fertilissima vs treatment with gibberellic acid.

'Rosette long-day' disorder in the late transplanted Indica rice, Giza 175, was actively controlled by inoculation with Aulosira fertilissima applied as a soil-based inoculum. Effect of the cyanobacterium was comparable to dual foliar application of 10 ppm gibberellic acid, 1 and 2 months after transplanting. Enhancement of rice performance by the cyanobacterium was more efficient with urea applied at 48 or 96 rather than 144 kg N/ha.