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International Journal of Agronomy
Volume 2011, Article ID 974040, 8 pages
Research Article

Mapping Irrigated Area Fragments for Crop Water Use Assessment Using Handheld Spectroradiometer

Environmental Protection Agency, Field Operations, Volta Region, P.O. Box HP 513, Ho, Ghana

Received 27 September 2010; Revised 8 March 2011; Accepted 10 August 2011

Academic Editor: Bernd Lennartz

Copyright © 2011 S. Sovoe. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


As climatic change and land use are altering the hydrographic regime, most catchments are progressively becoming drier and farmers are shifting from rainfed agriculture to irrigation practices to enable them to carry out income-generating activities throughout the year. The Ghanaian government has recently been promoting irrigation agricultural practices as the population keeps increasing and the demand for food keeps soaring. In order to keep pace with high demand for food coupled with increasing aridity of the subregion, some farmers resort to informal irrigation practices. In this study, hyperspectral reflectance data of the irrigated crops under informal practices were collected to assess their efficiency of water use. Photochemical reflectance index (), soil-specific nitrogen index (), and water band index () were computed. The and were significantly correlated, while there was no significant correlation between and . The map showing the probability of water stress indicated that informal irrigation practices are not an efficient water management approaches.