Abstract
ABSTRACTPartial root drying (PRD) has been shown to be an efficient technique that allows water savings in areas where water availability is a major concern for agricultural production. A study was designed to compare the performance of different degrees of conventional deficit irrigation and PRD techniques on soybean production. This study was conducted at the research field of the University of Tehran in Karaj, Iran, in 2008. The study consisted of four furrow irrigation treatments of full irrigation (FI) (100% soil moisture deficit compensation), conventional deficit irrigation at 50% (DI50%), 75% (DI75%) and partial root drying at 50% (PRD50%) soil moisture deficit compensation, with three replications. The results showed that water productivity (WP) in the PRD50% treatment was 70.1, 61.9 and 48.3% higher than the FI, DI75% and DI50% treatments, respectively. Based on the economic analysis, the results showed that under limited land conditions (when arable land availability and not water is the limiting factor), the DI75% treatment is recommended as a preferred management scheme, whereas, under unlimited land conditions, PRD50% was more efficient. Copyright © 2011 John Wiley & Sons, Ltd.
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