Effect of Different Levels of Zeolite on Yield of Red Bean (Phasaeolus vulgaris L.) Under Drought Stress in Kermanshah Climate Condition

In order to investigate the effect of zeolite on yield and yield components of red beans under drought stress in the field, an experiment was conducted in 2014 in the Takhte Shirin Plantation Company located in the Sahneh, Kermanshah through split plot based on a randomized complete block design with 3 replications. In this experiment, water stress was the main factor with 3 levels, (normal irrigation based on 60 mm evaporation from evaporation basin, mild drought stress after the four-leaf stage based on 90 mm evaporation from evaporation basin and severe drought stress after the four-leaf stage based on the 120 mm evaporation from evaporation basin) considered in the main plot, and zeolite with 4 levels (0, 5, 10 and 15 t/ha) was placed in the sub plots. The results showed that different levels of drought stress caused a significant reduction (P