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Combination of Azolla and Urea Nitrogen for Satisfactory Production of Irrigated Boro Rice (BRRI Dhan 29)

Author(s): Shamima Akhter | M.H. Mian | M.A. Kader | S.A. Begum

Journal: Journal of Agronomy
ISSN 1812-5379

Volume: 1;
Issue: 3;
Start page: 127;
Date: 2002;
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Keywords: Azolla | Rice | urea | biomass | N P and S uptake

A suitable combination of Azolla and urea-N was investigated for cultivation of rice (cv. BRRI Dhan 29). For this purpose an attempt was made to apply 30, 40, 50, 60 and 70% of the recommended doses of urea in 2 or 3 splits along with incorporation of one layer of Azolla grown from 0.2 kg m-2 inoculum. Two separate treatments of applying 100% of the recommended dose of urea in 3-splits (without Azolla) and no application of N at all from either urea or Azolla were included. Azolla covered the surface area in 13 days after inoculation at 7 DAT and reached the maximum growth in 19 days producing 14.0 to 18.3 t ha-1 fresh biomass containing 20.7 to 26.4 kg N ha-1. Incorporation of one layer of Azolla at 30 DAT plus application of 50, 60 and 70 kg N ha-1 in 3 splits constituted the application of 72.7, 81.6 and 91.1 kg N ha-1 that produced 5.58, 6.00 and 6.02 t ha-1 grain yields which were statistically similar to each other but the latter two were statistically superior to the grain yield of 5.40 t ha-1 produced by conventional recommended practice. Total uptake of N, P and S by the rice plants (grain+straw) were increased significantly due to incorporation of Azolla. Incorporation of one layer of Azolla plus application of 60% of urea-N appeared as the best combination in this study.

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