| Abstract:
In order to study the effect of super absorbent polymer on some agronomic characters (yield, seed 100 weight and Harvest index) and phyisiological characters (EC, RWC) in red bean (phaseolus vulgaris) varieties under drought stress, various tests conducted in laboratory and greenhouse experiments in research station of the Islamic Azad University, Karaj Branch in 2005. In greenhouse experiment factorial design under randomized complete block design (RCBD) with four replications were used, varieties were factor A (Derakhshan, D81083, Naz) and time of irrigation was factor B and C with superabsorbent concentration (0, %5, %7). Irrigation treatment was on main plot, and factor B, C were on sub plot. The results showed significant difference between irrigation treatments, varieties and polymers concentration for measured characteristics. Drought stress caused significant effects on increasing EC and reduced seed yield, seed 100 weight and Harvest index. super absorbent polymer (7%) increased the agronomic characteristics. Naz and Derakhshan varieties were drought tolerant and sensitive varieties respectively. The results showed that super absorbent, absorb and keep the water around the roots and it can reduce death of plants from water shortage. These compounds can increase agronomic characteristics, so with attention to increasing yield and yield components and reducing the use of water, application of superabsorbent was proposed specially in water deficit condition.
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