Effect of urea on decomposition of azolla
1987
Subramani, S. | Kannaiyan, S. (Tamil Nadu Agricultural Univ., Coimbatore, Tamil Nadu (India). Agricultural Microbiology Dept.)
Urea as a foliar spray over the azolla mat was applied in a pot culture experiment to study azolla decomposition. One liter soil extract medium was kept in plastic tubs and 30 g Azolla pinnata, A. microphylla, and A. filiculoides inoculated and maintained. Urea was added directly to the soil extract solution at 50, 100, 250, 500, 1,000, and 2,000 ppm or sprayed at 3 d after inoculation. At 5 d after urea treatment, the decayed biomass was filtered in muslin and the moisture content removed by placing the mass on tissue paper. With increased urea concentration, azolla decomposition increased. Urea at 2,000 ppm caused considerable weight reduction in all the three species of azolla. Weight reduction was highest in A. microphylla. Urea incorporated into the soil extract significantly activated decomposition.
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