Use of Azolla as biofertilizer for cultivation of BR 26 rice in Aus season
2001
Hossain, M.B. (Bangladesh Inst. of Nuclear Agriculture, Mymensingh (Bangladesh). Soil Microbiology Lab.) | Mian, M.H. | Hashem, M.A. | Islam, M.Z. | Shamsuddoha, A.T.M.
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 1.8 % after crop harvest).
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