Dembele Y.,Institute for Environment and Agricultural Research INERA |
Yacouba H.,International Institute for Water and Environmental Engineering |
Keita A.,International Institute for Water and Environmental Engineering |
Sally H.,International Water Management Institute IWMI
Irrigation and Drainage | Year: 2012
A methodology for assessing irrigation system performance was developed by the then International Irrigation Management Institute (IIMI, now IWMI) in the 1990s in Burkina Faso. It was applied successfully to small-scale reservoir-based irrigation schemes (50-150ha). The current study was carried out on two larger river-diversion irrigation systems in the south-west of the country, namely Vallée du Kou (1200ha) and Karfiguéla (350ha), in order to analyse and verify: the applicability of the methodology to large-scale river-diversion schemes with more complex hydraulic networks and greater economic activities; the relevance of the performance indicators used and the constraints pertaining to the acquisition of the basic data required for their determination; the scope for adoption and application of the methodology by farmers' organizations for routine performance monitoring. The methodology seems well suited for large-scale irrigation systems, but its adoption by farmers' organizations has to be facilitated and accompanied by adequate training and the close involvement of the system managers. The indicators requiring the manipulation of a few physical elements can be determined relatively easily. Those involving water measurements are more difficult to calculate. The study makes a critical analysis of some indicators and demonstrates the evidence of the necessity to select among the indicators with regard to the irrigation system context. © 2011 John Wiley & Sons, Ltd.
Zougmore R.,Institute for Environment and Agricultural Research INERA |
Mando A.,British Petroleum |
Stroosnijder L.,Wageningen University
Nutrient Cycling in Agroecosystems | Year: 2010
The synergistic effect of soil and water conservation (SWC) measures (stone rows or grass strips) and nutrient inputs (organic or mineral nutrient sources) was studied at Saria station, Burkina Faso. The reduction in runoff was 59% in plots with barriers alone, but reached 67% in plots with barriers + mineral N and 84% in plots with barriers + organic N, as compared with the control plots. Plots with no SWC measure lost huge amounts of soil (3 t ha-1) and nutrients. Annual losses from eroded sediments and runoff reached 84 kg OC ha-1, 16.5 kg N ha-1, 2 kg P ha-1, and 1.5 kg K ha-1 in the control plots. The application of compost led to the reduction of total soil loss by 52% in plots without barriers and 79% in plots with stone rows as compared to the losses in control plots. SWC measures without N input did not significantly increase sorghum yield. Application of compost or manure in combination with SWC measures increased sorghum grain yield by about 142% compared to a 65% increase due to mineral fertilizers. Yields increase did not cover annual costs of single SWC measures while application of single compost or urea was cost effective. The combination of SWC measures with application of compost resulted in financial gains of 145,000 to 180,000 FCFA ha-1 year-1 under adequate rainfall condition. Without nutrient inputs, SWC measures hardly affected sorghum yields, and without SWC, fertilizer inputs also had little effect. However, combining SWC and nutrient management caused an increase in sorghum yield. © 2008 Springer Science+Business Media B.V.