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GROUNDWATER CONTRIBUTION TO CORN WATER USE IN INLAND VALLEY OF BADEGGI, NIGERIA
Abstract:
In order to quantify the groundwater contribution to total corn water use, two sets of experiments were conducted. One was in a greenhouse were corn was grown in a cylindrical containers in which the water table depths were maintained at 100, 200, 300, 450, and 600 mm. The second was in an open field along an inland valley where water table depths range of 200 to 500 mm and 600 to 800 mm were used. The sources of water for meeting the water requirement of corn in a greenhouse during the crop growing seasons of 1997 to 1999 were the water table and surface water application. The corn on the field was rainfed in the month of September and partly in October and thereafter, left to obtain water from the groundwater table during the remaining dry period of October to December of each year during the study period. The maximum yield was 1.3 t/ha at the 450 mm water depth in the greenhouse, which is therefore taken as a suitable water regime for corn grown under the greenhouse culture. The grain yield of 2.9 t/ha in the field plots situated naturally within the water table depth range of 200 to 500 mm along the valley toposequence was higher when compared to the yield of 0.8 t/ha from plots on water table depth range of 600 to 800 mm. It is found that as much as 37% of the total corn evapotranspiration demand was derived from the groundwater. The water table fluctuations along the inland valley during the period of study can be represented by an exponential function of time during the wet season. However, Fourier series curves at weekly time steps gave a better representation of the water table fluctuation for both the wet and dry seasons.
GROUNDWATER CONTRIBUTION TO CORN WATER USE IN INLAND VALLEY OF BADEGGI, NIGERIA
