Effect of Irrigation Management and Different Levels of Straw Mulch on Yield and Yield Components of Bean (phaseolus Vulgaris)

In order to investigate the effect of irrigation and straw mulch on yield and yield components of bean، a split-plots experiment with randomized complete block design in three replications was conducted in Astaneh Ashrafiyeh city during 2012. In this study، irrigation management treatments including no irrigation، irrigation frequencies of 6، 12، and18 days، and different amounts of straw mulch as 0، 1، 2، and 3 cm thickness were examined. The results of the analysis of variance revealed that irrigation management and different levels of mulch had significant effects on seed yield. But، their interaction was not significant on seed yield. The trend of variations indicated that the highest seed yield with 2431. 3 kg ha-1 was associated with irrigation frequency of 6 days. [n response to the main effects of mulch levels، the highest average seed yield (1585. 6 and 1518. 4 kg ha-1) was obtained in the 2 and 1 cm treatments، respectively. Also، using straw mulch in irrigation conditions prevented severe seed loss in comparison with no mulch condition. The highest water use efficiency was in irrigation frequency of 18 days with an average of 0. 58 kg m-3. Water use efficiency at straw mulch levels of 1 and 2 cm was observed as 0. 63 and 0. 6 kg m-3، respectively.