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FIELD EVALUATION OF WATER INFILTRATION PROFILE IN OPENED AND BLOCKED FURROW IRRIGATION WITH CONTINUOUS FLOW

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032244,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13814) @2003
Authors:   Roberto Vieira Pordeus, Carlos Alberto Vieira de Azevedo, Vera Lúcia Antunes de Lima, José Dantas Neto, Márcia Rejane de Queiroz Almeida Azevedo,
Keywords:   furrow irrigation, performance, infiltrated water depth, blocked furrow

A better water application unifomity along the field would satisfy the crop water needs and stil improve the performance of furrow irrigation systems. The variations on water advance time along the furrow irrigation are mostly responsible for variations on infiltration opportunity time, which result on non-uniform water infiltration profile. The purpose of this research was to observe the behavior of the water infiltration profile in opened and blocked furrow irrigation with continuous flow. Employing a site-specific water application time for both furrow conditions (opened and blocked), field evaluation meassurements were performed in eight furrow irrigation systems from the So Gonalo irrigation district, Brazil. The results showed that in opened furrows the differences between the water depths infiltrated at the beginning and at the end of the field were much larger than in blocked furrows. Actually, the infiltrated water depths at the end of the field in blocked furrows were from 12.14 to 96.41% larger than in opened furrows. In blocked furrows, for some cases where the infiltration rate was lower, the infiltrated water depths at the end of the field were larger than at the beginning of the field, allowing a more adequate management strategy with a smaller water application time; consequently, the water uniformity distribution in blocked furrows increased from 4.95 to 23.2%.

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