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Title

PATH ANALYSIS OF CUMULATIVE INFILTRATION IN FURROWS

Pages

 Start Page 137 | End Page 152

Abstract

 Soil infiltration characteristics affect the design, evaluation and management of furrow irrigation over a field. On the other hand, different variables influence furrow infiltration, making infiltration modeling for a field a complex process. This study was conducted to investigate the direct and indirect effects of all variables affecting furrow infiltration. The blocked furrow method was used to measure furrow infiltration for a field with soil of sandy loam. Results showed that infiltration time was the most effective variable affecting CUMULATIVE INFILTRATION by directly and significantly affecting furrow infiltration. The relative contribution of the filtration time to the furrow infiltration was seven times more than the contribution of the wetted perimeter and 2.5 times that of the flow section area. An additive and nonlinear model was proposed to describe field-wide CUMULATIVE INFILTRATION using the observed data. The proposed model described approximately 89% of the variation in field-wide CUMULATIVE INFILTRATION.

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