Fahad Kimera¹, Hani Sewilam^1,2*, Emad Imam³

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¹ Center for Sustainable Development, The American University in Cairo, Cairo, Egypt.
² Department of Engineering Hydrology, The RWTH Aachen University, Aachen, Germany.
³ Department of Irrigation, Cairo University, Cairo, Egypt.
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Abstract: Rainfall variability and the recurrent droughts in the semi-arid regions of Sub-Saharan Africa have far reaching consequences. They have major effects on the socio-economic and environmental sustainability of rural communities. This study investigates the technical, economic, and financial feasibility of small-scale rain water harvesting, and supplemental irrigation (RWHSI) system to mitigate the negative impact of long droughts on crop production. The proposed system consists of limited farm grading to direct the harvested rain water to a lined earth-pond where several alternatives for pumping are proposed for supplemental irrigation schemes. The proposed scheme is mainly activated during the short period when the soil moisture is most critical for the crop yield. To reach an optimum size of the pond, the soil moisture during the critical growth period is simulated using FAO’s water productivity model (AquaCrop). The pond size is optimized by applying AquaCrop for several years with the actual rainfall pattern and the possible supplemental irrigation applications. For each year with its possible drought periods, crop yield for each pond size is predicted, then used for the economic feasibility of the pond sizes. The optimum pond size is the one maximizing its benefit over its cost. The feasibility of the proposed RWHSI is investigated on maize production for the Soroti area in Uganda. For the rainfall pattern, soil conditions, and maize growth characteristics of Soroti, the proposed RWHSI is proved by simulations to be technically, and economically feasible. For a typical farm holding with a catchment area of one hectare, an 800 cubic-meters lined earth-pond can give up to 50% increase in the maize yield. After considering the construction and running costs of the supplemental irrigation system, the pay-back period is 6 years. The required investment cost for this RWHSI is low, and likely to be within the financial capacity of many farmers, while their selection of the pumping system will depend on their manpower and financial ability.

Keywords: Runoff Harvesting, Rain-Fed Irrigation, Rainwater Harvesting, Sub-Saharan Africa, Drought Mitigation

Cite this paper: Kimera, F. , Sewilam, H. and Imam, E. (2018) Economic Benefits of Supplemental Irrigation in Uganda. Agricultural Sciences, 9, 1401-1418. doi: 10.4236/as.2018.911097.

References

[1]   World Bank (2017) Water in Agriculture. Understanding Poverty.
http://www.worldbank.org/en/topic/water-in-agriculture

[2]   Frone, D.-F. and Frone, S. (2015) The Importance of Water Security for Sustainable Development in the Romanian Agri-Food Sector. Agriculture and Agricultural Science Procedia, 6, 674-681.
https://doi.org/10.1016/j.aaspro.2015.08.120

[3]   Katko, T.S. and Hukka, J.J. (2015) Social and Economic Importance of Water Services in the Built Environment: Need for More Structured Thinking. Procedia Economics and Finance, 21, 217-223.
https://doi.org/10.1016/S2212-5671(15)00170-7

[4]   FAO (2009) The Challenge. In: How to Feed the World 2050, 4.

[5]   Pandey, P.K., van der Zaag, P., Soupir, M.L. and Singh, V.P. (2013) A New Model for Simulating Supplemental Irrigation and the Hydro-Economic Potential of a Rainwater Harvesting System in Humid Subtropical Climates. Water Resources Management, 27, 3145-3164.
https://doi.org/10.1007/s11269-013-0340-1

[6]   Rockström, J., et al. (2010) Managing Water in Rainfed Agriculture—The Need for a Paradigm Shift. Agricultural Water Management, 97, 543-550.
https://doi.org/10.1016/j.agwat.2009.09.009

[7]   Falkenmark, M., Fox, P., Persson, G. and Rockström, J. (2001) Water Harvesting for Upgrading of Rainfed Agriculture Problem Analysis and Research Needs. Stockholm.

[8]   Conway, D. (2005) From Headwater Tributaries to International River: Observing and Adapting to Climate Variability and Change in the Nile Basin. Global Environmental Change.

[9]   Ngigi, S.N. (2003) What Is the Limit of Up-Scaling Rainwater Harvesting in a River Basin? Physics and Chemistry of the Earth, 28, 943-956.
https://doi.org/10.1016/j.pce.2003.08.015

[10]   Freitas, A. (2013) (Rep.). European Union Institute for Security Studies (EUISS).
http://www.jstor.org/stable/resrep06915

[11]   Frenken, K. (2005) Irrigation in Africa in Figures: AQUASTAT Survey, 2005. Food and Agriculture Organization of the United Nations.

[12]   Helena, S., Lucia, S., Town, G. and Asia, S. (2014) Urban and Rural Areas 2014. Population Division, Department of Economic and Social Affairs, United Nations.

[13]   Yohannes, O. and Yohannes, K. (2013) Turmoil in the Nile River Basin: Back to the Future? Journal of Asian and African Studies.
https://doi.org/10.1177/0021909612447175

[14]   GoU (2010) National Development Plan (2010/11-2014/15). Development, April 2010, 417.

[15]   MAAIF (2010) Agriculture for Food and Income Security. Kampala.

[16]   Mugasha, C. (2014) Uganda: Farmers Want to Turn to Irrigation as Drought Drags on.
http://nepadwatercoe.org/uganda-farmers-want-to-turn-to-irrigation-as-drought-drags-on/

[17]   McCartney, M. and Smakhtin, V. (2010) Water Storage in an Era of Climate Change: Addressing the Challenge of Increasing Rainfall Variability. Blue Paper.
https://doi.org/10.5337/2010.012

[18]   Fischer, G., et al. (2012) Global Agro-Ecological Zones (GAEZ): Model Documentation. 1-179.

[19]   Kannan, N., Senthivel, T., Rayar, A.J. and Frank, M. (2010) Investigating Water Availability for Introducing an Additional Crop Yield in Dry Season on Hill Land at Rubirizi, Rwanda. Agricultural Water Management, 97, 623-634.

[20]   Nangia, V. and Oweis, T. (2016) Supplemental Irrigation: A Promising Climate-Resilience Practice for Sustainable Dryland Agriculture. In: Farooq, M. and Siddique, K., Eds., Innovations in Dryland Agriculture, Springer, Cham, 549-564.

[21]   Oweis, T. and Hachum, A. (2012) Supplemental Irrigation—A Highly Efficient Water-Use Practice. Aleppo.

[22]   Pandey, P.K., Panda, S.N. and Panigrahi, B. (2006) Sizing On-Farm Reservoirs for Crop-Fish Integration in Rainfed Farming Systems in Eastern India. Biosystems Engineering, 93, 475-489.
https://doi.org/10.1016/j.biosystemseng.2006.01.009

[23]   McSweeney, C., New, M. and Lizcano, G. (2006) UNDP Climate Change Country Profiles.

[24]   Kansiime, M.K., Wambugu, S.K. and Shisanya, C.A. (2013) Perceived and Actual Rainfall Trends and Variability in Eastern Uganda: Implications for Community Preparedness and Response. Journal of Natural Sciences Research, 3, 2225-2921.

[25]   Geerts, S. and Raes, D. (2009) Deficit Irrigation as an On-Farm Strategy to Maximize Crop Water Productivity in Dry Areas. Agricultural Water Management, 96, 1275-1284.
https://doi.org/10.1016/j.agwat.2009.04.009

[26]   Mango, N., Makate, C., Tamene, L., Powell, M. and Ndengu, G. (2018) Adoption of Small-Scale Irrigation Farming as a Climate-Smart Agriculture Practice and Its Influence on Household Income in the Chinyanja Triangle, Southern Africa. 1-32.

[27]   Vohland, K. and Barry, B. (2009) A Review of in Situ Rainwater Harvesting (RWH) Practices Modifying Landscape Functions in African Drylands. Agriculture, Ecosystems and Environment, 131, 119-127.
https://doi.org/10.1016/j.agee.2009.01.010

[28]   GoU and UNFPA (2009) The State of Uganda Population Report 2009: Addressing the Effects of Climate Change on Migration. Development, 1-78.

[29]   Ocowunb, C. (2009) Uganda: Long Droughts, Food Shortage Hit Country as Victims Cry out for Help.
http://allafrica.com/stories/200907090729.html

[30]   Majaliwa, J.G.M., et al. (2015) Characterization of Historical Seasonal and Annual Rainfall and Temperature Trends in Selected Climatological Homogenous Rainfall Zones of Uganda. Global Journal of Science Frontier Research, 15.

[31]   NEMA (2007) State of the Environment Report for Uganda. Kampala.

[32]   Stark, J. (2011) Climate Change and Conflict in Uganda: The Cattle Corridor and Karamoja. Karamoja.

[33]   Mubiru, D.N., Komutunga, E., Agona, A., Apok, A., Ngara, T. and Mubiru, D. (2012) Characterising Agrometeorological Climate Risks and Uncertainties: Crop Production in Uganda. South African Journal of Science, 108, 108-118.

[34]   Atta-Krah, K., Sanginga, N., Tripathi, B.R. and Psychas, P.J. (1992) The Afneta Alley Farming Training Manual. Alley Farming Network for Tropical Africa.

[35]   Chenery, E.M. (1960) An Introduction to the Soils of the Uganda Protectorate. Kawanda Research Station, Kampala.

[36]   Kaaya, A.K., Msanya, B.M. and Mrervla, J.P. (1994) Soils and Land Evaluation of Part of the Sokoine University of Agriculture Farm (Tanzania) for Some Crops under Rainfed Conditions. African Study Monographs, 15, 97-117.

[37]   Driessen, P. (2001) Lecture Notes on the Major Soils of the World. FAO, Rome.

[38]   Okalebo, J., Gathua, K. and Woomer, P. (2002) Laboratory Methods of Soil and Plant Analysis: A Working Manual. 2nd Edition, Sacred African Publishers, Nairobi.

[39]   Subedi, P. and Shrestha, J. (2015) Improving Soil Fertility through Azolla Application in Low Land Rice: A Review. Azarian Journal of Agriculture, 2, 35-39.

[40]   Van Hove, C., Baillonville, T.D.W., Diara, H.F., Godard, P., Kodomi, Y.M. and Sanginga, N. (1987) Azolla Collection and Selection.

[41]   Imbahale, S.S., Mweresa, C.K., Takken, W. and Mukabana, W.R. (2011) Development of Environmental Tools for Anopheline Larval Control. Parasites and Vectors, 4, 1-10.
https://doi.org/10.1186/1756-3305-4-130

[42]   Mahapatra, B.S. and Sharma, G.L. (1989) Integrated Management of Sesbania, Azolla and Urea Nitrogen in Lowland Rice under a Rice-Wheat Cropping System. The Journal of Agricultural Science, 113, 203.
https://doi.org/10.1017/S0021859600086779

[43]   Ashraf, H., Matto, F.A., Ganai, A.M., Reshi, I.M. and Sheikh, F.A. (2015) Effect of Replacement of Mustard Oil Cake with Azolla (Azolla pinnata) Meal on Growth Performance of Broilers and Economics of Feeding under Temperate Conditions. Indian Journal of Animal Nutrition, 32, 325-328.

[44]   Singh, B., Meena, G., Meena, K., Meena, R., Singh, B. and Indoria Krishi Vigyan Kendra, D. (2017) Effect of a Wonder Herb Azolla on Buffaloes Milk Yield. International Journal of Current Microbiology and Applied Sciences, 6, 1059-1066.
https://doi.org/10.20546/ijcmas.2017.611.124

[45]   Pandey, P.K., Soupir, M.L., Singh, V.P., Panda, S.N. and Pandey, V. (2011) Modeling Rainwater Storage in Distributed Reservoir Systems in Humid Subtropical and Tropical Savannah Regions. Water Resources Management, 25, 3091-3111.
https://doi.org/10.1007/s11269-011-9847-5

[46]   FAO (2017) Final Evaluation of the Global Climate Change Alliance (GCCA). Agricultural Adaptation to Climate Change Project.

[47]   Brouwer, C. and Heibloem, M. (1986) Chapter 2: Crop Water Needs.
http://www.fao.org/docrep/s2022e/s2022e02.htm

[48]   MEV (2007) Climate Change: Uganda National Adaptation Programmes of Action (NAPA). Ministry of Water and Environment (MEV), Kampala, 73.

[49]   Rockström, J. and Barron, J. (2007) Water Productivity in Rainfed Systems: Overview of Challenges and Analysis of Opportunities in Water Scarcity Prone Savannahs. Irrigation Science, 25, 299-311.
https://doi.org/10.1007/s00271-007-0062-3

[50]   Barron, J., Rockström, J., Gichuki, F. and Hatibu, N. (2003) Dry Spell Analysis and Maize Yields for Two Semi-Arid Locations in East Africa. Agricultural and Forest Meteorology, 117, 23-37.
https://doi.org/10.1016/S0168-1923(03)00037-6

[51]   Trading Economics (2017) Uganda Inflation Rate—Forecast.
https://tradingeconomics.com/uganda/inflation-cpi/forecast