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Use of Azolla as Biofertilizer for Cultivation of BR 26 Rice in Aus Season

Author(s): M. B. Hossain | M. H. Mian | M. A. Hashem | M. Z. Islam | A. T. M. Shamsuddoha

Journal: Journal of Biological Sciences
ISSN 1727-3048

Volume: 1;
Issue: 12;
Start page: 1120;
Date: 2001;
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Keywords: Azolla | Rice | NPS uptake | organic matter

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).

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