INFLUENCE OF AZOLLA WITH DIFFERENT LEVELS OF UREA IN RICE PRODUCTION IN SOUTH WEST BANGLADESH

Monowara  Khatun; Md. Sadiqul  Amin; S.M. Hafizur  Rahman

doi:10.53808/KUS.2013.11and12.1212-SC

Authors

Monowara Khatun Soil Science Discipline, Khulna University, Khulna 9208, Bangladesh
Md. Sadiqul Amin Soil Science Discipline, Khulna University, Khulna 9208, Bangladesh
S.M. Hafizur Rahman Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, Bangladesh

DOI:

https://doi.org/10.53808/KUS.2013.11and12.1212-SC

Keywords:

Satla soil series, Azolla, rice, biofertilizer, nitrogen, urea

Abstract

A pot experiment was conducted on Satla soil series in Terokhada Upazilla, Khulna during the boro season (February to June) to see whether Azolla (biofertilizer) could be grown together with BRRI dhan 28 and to compare the effect of the recommended dose of N (100 kg N ha^-1) with that of different combinations of urea and Azolla (all treatments having the recommended doses of P, K, S and Zn). The experiment was laid out in a completely randomized design with 5 treatments and 4 replications. Azolla pinnata applied 0.2 kg m^-2grew well with BRRI dhan 28. The highest amount of grain yield of 2.35 t ha^-1 was produced by the application of 75 Kg N ha^-1 with Azolla. One layer of Azolla with 50 kg ha^-1 urea-N produced almost same amounts of grain. Thus the rate of 0.2Kg m^-2 Azolla inoculums as N source along with 50-75% Urea-N ha^-1 appeared to be a good practice in reducing the use of costly urea (chemical N source) fertilizer by about 25-50%.

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