Research Article 
Use of Azolla as Biofertilizer for Cultivation of BR 26 Rice in Aus Season
M. B. Hossain, M. H. Mian, M. A. Hashem, M. Z. Islam and A. T. M. Shamsuddoha
Journal of Biological Sciences, 2001, 1(12), 1120-1123.
Abstract
An experiment was conducted in silt loam soil (pH 6.52) to compare the effect of the recommended dose of N (80 kg N ha-1) with that of incorporated two layers of Azolla plus 40 kg N ha-1 or Azolla left floating (no incorporation) plus 40 kg N ha-1 on the yield and NPS uptake by BR 26 rice. The highest grain yield of 3.95 t ha-1 with the highest total (grain + straw) uptake of 75.4 kg N ha-1, 32.7 kg P ha-1 and 8.5 kg S ha-1 were recorded for incorporations of two layers of Azolla (grown from 0.2 kg m-2 inoculum) at 25 and 40 DAT plus application of 40 kg N ha-1 at 15 and 60 DAT- all of which remained statistically at par with their counterparts of another similar treatment but using 0.1 kg m-2 inoculum instead. All these data differed significantly with those that were recorded against the recommended dose of N as urea. Azolla left growing after inoculation was found significantly beneficial for rice growth. Azolla contributed to the increased uptake of N, P and S. Incorporation of two layers of Azolla biomass showed slight increases in soil organic matter status (from 1.85% initial to 1.88% after crop harvest).
ASCI-ID: 38-431
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