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Agnes MS Nyomora
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Journal of Environment and Waste Management

Effect of treated domestic wastewater as source of irrigation water and nutrients on rice performance in Morogoro, Tanzania

Agnes MS Nyomora

Department of Botany, University of Daressalaam, P.O. Box 35060, Tanzania.

Accepted 19 January, 2015. 

Citation: Nyomora AMS (2015). Effect of treated domestic wastewater as source of irrigation water and nutrients on rice performance in Morogoro, Tanzania. Journal of Environment and Waste Management 2(2): 047-055.

Copyright: © 2014 Nyomora AMS. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


A study was conducted in Morogoro, Tanzania to assess the effect of treated wastewater as an alternative source of irrigation water and nutrients for rice. Wastewater was sourced from a local wastewater Stabilization Ponds and cleaned through a Constructed Wetland. Four treatments namely, (i) Waste water (WW) only (ii) WW + NPK (iii) Tap water only (iv) Tap water + NPK were tested in a Randomized Complete Block Design (RCBD) with 4 replicates. Rice, variety Saro 5 was planted in August 2013.Data was collected on physical-chemical and biological qualities of the WW, and soils, yield and yield components. Analysis of variance and Least Significant Difference (LSD) on yield were conducted (p≤0.05) using INSTAT software. WW had alkaline pH of 8.2 and acceptable levels of physical-chemical-biological components. WW only treated rice resulted in higher yields over non-treated rice. The combination of WW and NPK was not as effective especially for flowering, grain size and total yield indicative of nutrients overloading.  Tap water only treated rice yielded 1.3 tons/ha while WW treated rice yielded 5.44 ton/ha mostly through promotion of higher number of fertile tillers while a combination of WW and NPK depressed yield potential to only 1.7 ton/ha. Effectiveness of WW for irrigation is acknowledged.

Keywords: Constructed wetlands, saro 5 rice, irrigated rice, organic fertilizer, alternative irrigation, wastewater