The Effects of Malasses Wastewater on Common Bean Yields in Acid Soils of Kenya


  • E. K. Bore Chepkoilel University College P.O.BOX 1125 Eldoret, Kenya
  • P. K. Ndalut Chepkoilel University College, School of Science, P.O Box 1125, Eldoret, Kenya
  • M. K. Arusei Chepkoilel University College, School of Science, P.O Box 1125, Eldoret, Kenya


soil acidity, wastewater, lime, biogas effluent, common bean crop


Muhoroni Agro-Chemicals and Food Company produces approximately 1.2 million litres of wastewater per day that empties into River Nyando. The wastewater discharged is not environmentally friendly and calls for proper treatment and disposal modalities. The study  explored disposal of the wastewater by formulation of organic fertilizer  and using it  to reverse  soil acidity. The fertilizer was used to grow common bean crop. Both field and greenhouse experiments were conducted for two seasons at Chepkoilel Campus, Moi University, Eldoret. Soil samples taken during cropping seasons were used to determine changes in  soil  chemical properties. After harvesting, the grain yields and economic analysis of treatments were done. Important results of the study were that combination of wastewater, biogas  effluent,  lime  produced the highest increase in soil pH of over 1.2 units in both seasons. It also registered the highest increase in overall grain yields by over 250% in both seasons over the control and posted highest net profit of over US$ 416. The soil organic carbon and calcium increased by over 0.3 Cmol/kg while Olsen phosphorus increased by over 10  ppm in treatments with lime. Therefore,  the organic fertilizer formulated is suitable in acidic soils.


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This work is patented. The Patent number is KE/P/2009/000971.




How to Cite

Bore, E. K., Ndalut, P. K., & Arusei, M. K. (2012). The Effects of Malasses Wastewater on Common Bean Yields in Acid Soils of Kenya. East African Journal of Pure and Applied Sciences, 2(1), Pg 104–123. Retrieved from