study on effects of different crop rotations based on wheat on soil physicochemical properties and economical performance in dryland condition of kermanshah

this study was conducted to investigate economic aspect and some soil properties in different crop rotations of wheat in dryland conditions in sararood - kermanshah during six years 2006-2012. the experiment carried out based on randomized complete block design (rcbd) with four replications in two neighbor sites. treatments were wheat-wheat, fallow - wheat, chickpea-wheat, vetch-wheat and safflower-wheat. soil organic carbon percentage in vetch - wheat treatment increased (0.18%) in the end of rotation period in compare to the first of period. mean comparison of soil compaction in 20-30 cm depth of soil showed fallow - wheat treatment had highest and safflower - wheat the lowest soil compaction. soil permeability results in the end of experiment period showed effect of crop rotation was significant and safflower- wheat and fallow-wheat had the highest and the lowest permeability, respectively. results of economical analysis showed the most economical treatment was chickpea-wheat and after that safflower-wheat was economical. therefore, in kermanshah province continuous wheat couldn’t be recommend but to increase and reserve soil productivity and to access higher income biannual rotation of wheat with vetch, chickpea or safflower crops can be proposed.