Effect of Irrigation with Waste Water on Soil Characteristics and Bean Yield: A Case Study of University of Eldoret Farm
DOI:
https://doi.org/10.2200/aerj.v3i2.162Keywords:
CROPWAT, Decision Making Tool, RCBD, Wastewater, Water Recycling and Irrigation SchedulingAbstract
Experimental field treatments were set up at the University of Eldoret farm that is next to the wastewater treatment plant. The farm is located in Uasin Gishu County, Kenyan North Rift part. The field experiments were carried out between June and October 2018. The irrigation was supplemental to the reducing rainfall amounts. The key objective of the study was to evaluate the effect of wastewater irrigation on soil physical and chemical characteristics, and bean crop yield. The approach took a randomised complete block design (RCBD) where the treatments were replicated twice. For the treatments, wastewater with four levels of NPK% (0%, 25%, 50%, and 75%) and freshwater with five levels of NPK % (0%, 25%, 50%, 75%, and 100%) were applied to the plots. The freshwater at 100% NPK was considered as the control experiment. For all the plots, supplemental irrigation was carried out where equal amounts of water were applied based on crop water requirement and growth stages for the crop. CROPWAT and CLIMWAT were used as the models to simulate the correct crop water requirement and develop an irrigation schedule. Wastewater samples were collected from the tertiary pond and tested in the chemistry laboratory. Also, soil samples were collected before and after the planting period and tested in the soil science laboratory. Results showed that plots under 25% NPK and 50% NPK WW yielded more beans compared to fresh water. The soil physical structure improved while components like Nitrogen, Potassium, and Phosphorous increased with significant amounts. The use of wastewater for irrigation around the Eldoret area calls for these optimum conditions to guarantee the food sufficiency in the region and Kenya at large. The irrigation schedule can be used as a decision-making tool for the local farmers to achieve an optimum irrigation efficiency. More research and awareness is required for the cultural aspect that surrounds use of waste water irrigation in the local communities.
References
Drewa, P. B., Platt, W. J. & Moser, E. B. (1993). Fire effects on resprouting of shrubs in headwaters of southeastern longleaf pine savannas. Ecology, 83(3), 755-767.
Kimenyi, M. S. (2002). Agriculture, Economic Growth and Poverty Reduction. KIPPRA Occasional Paper No. 3. Nairobi: Kenya Institute for Public Policy Research and Analysis.
Loucks, D. P. & Van Beek, E. (2017). Water resource systems planning and management: An introduction to methods, models, and applications. Springer.
Lawston, P. M., Santanello Jr, J. A., Zaitchik, B. F. & Rodell, M. (2015). Impact of irrigation methods on land surface model spinup and initialization of WRF forecasts. Journal of Hydrometeorology, 16(3), 1135-1154.
Wakhungu, M. J. (2016). A cost benefit analysis of water recycling in manufacturing industries: A Case study of the east African breweries limited, Kenya. Unpublished MA Thesis, The University of Nairobi.
Marshall, S. (2011). The water crisis in Kenya: Causes, effects and solutions. Global Majority E-Journal, 2(1), 31-45.
Martín, M. Á., Pachepsky, Y. A., García-Gutiérrez, C. & Reyes, M. (2018). On soil textural classifications and soil-texture-based estimations. Solid Earth, 9(1), 159-165.
JICA. (1998). Case Study of the National Water Master Plan 1998.
Kim, H. Y. (2014). Analysis of variance (ANOVA) comparing the means of more than two groups. Restorative dentistry & endodontics, 39(1), 74-77.
Kiziloglu, F. M., Turan, M., Sahin, U., Kuslu, Y. & Dursun, A. (2008). Effects of untreated and treated wastewater irrigation on some chemical properties of cauliflower (Brassica olerecea L. var. botrytis) and red cabbage (Brassica olerecea L. var. rubra) grown on calcareous soil in Turkey. Agricultural water management, 95(6), 716-724.
