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The paddy field ecosystem provides an environment favorable for the growth of BGA (blue-green algae) with respect to their requirement for light, water, high temperature and nutrient availability that frequently produce luxuriant growths in rice field. This may account for the maximum abundance of BGA in paddy soils under as widely different climatic conditions, as found in India (Mitra, 1951) and the Ukraine (Prikthod’kova, 1971). Nutrients fixed by the algae are released either through exudation or through microbial decomposition after the cells die. Laboratory experiments have frequently shown that the BGA liberate large portions of their assimilated nitrogen (Roger et al., 1987) but no information is available on the exudation of fixed nitrogen by BGA under field condition but it is clear that only part of it is available to rice. Obviously the quantity of nutrients release to the growing crop will vary with different seasons of the year under various moisture and temperature condition.

Study on Percent Recovery of Nitrogen in Incubation with Five BGA (Blue-green algae) Species at Four Temperature and Three Moisture Conditions