effects of supplemental irrigation on yield and growth indices of three

in order to investigate the effects of different irrigation regimes on yield and growth indices of three chickpea cultivars, an experiment was conducted during the 2007 growing season at mashhad (iran). six irrigation regimes including i1; full irrigation, i2; irrigation at branching, i3; irrigation at flowering, i4; irrigation at pod formation, i5; irrigation at seed filling stage and i6; dry farming without irrigation (main factors). three kabuli chickpea cultivars ilc482, jam, karaj 12-60-31 (sub factors) in a spilt block experiment based on randomized block design with three replications. there were significant differences between supplemental irrigation levels on grain yield. the results showed that grain yield in supplemental irrigation at flowering stage was more than to supplemental irrigation at branching, podding and seed filling stages (respectively 3.3, 3.1 and 23%). within the three cultivars, grain yield, biological yield and harvest index were highest and lowest in ilc482 and karaj 12-60-31 cultivars respectively. the results showed that supplemental irrigation at flowering stage increased dry matter, leaf area index, crop growth rate, relative growth rate and net assimilation rate. the results showed that flowering stage in chickpea cultivars was sensitive to drought stress so, ilc482 cultivar also showed more tolerance to water stress condition.