Abstract
ABSTRACT THE water use efficiency, yields of beans and economic feasibility of furrow and subsurface irrigation systems were compared in field experi-ments. Subsurface irrigation required 55 percent less water to produce a yield of beans comparable to that obtained with furrow irrigation. Water use efficiencies of 81.9 and 37.5 kg of beans per cm of water were obtained for the treatments irrigated with subsurface and furrow irrigation systems, respectively. Spacing for subsurface irrigation laterals was obtained from a laboratory experiment and was 84 percent of the theoretical spacing. If the useable life of the porous pipe can be extended to 3 yr, the price of the subsurface system could be compar-able to that of the furrow irrigation system when water cost is $1.35 x 10-Vm3.
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