Study of conventional and ecological agronomic managements in common bean (phaseolus vulgaris) and their energy efficiency in Khomein region

To evaluate the energy efficiency of conventional and ecological agricultural managements in common bean ,an experiment was conducted in split plot , arrangement of treatments in randomized complete block design with three replications, in three years . Crop management factor with five levels , including high input conventional crop management , medium input conventional crop management , low input conventional crop management ,medium input integrated crop management, and organic crop management were conducted in the main plots and bean varieties with three levels , including Khomein local Pinto ,Dorsa white bean and Goli red bean were conducted in the subplots . During the growing season the crop was taken care. at the end of the season, addition to evaluate the yield and its components , total energy consumption in each management including the machinery, fertilizer types , herbicides , pesticides and water used for irrigation, as the input energy were calculated and After harvesting, the output energy from each treatment were calculated from the straw and seed energy of bean and comparative advantageous of all managements to gether by comparing their energy efficiency. The results showed that the difference between the yield of crop management and energy efficiency respectively 5 and 1% significance levels , respectively. The highest average grain yield of 3785 kg per hectare was obtain from the high input conventional crop management , but the difference was not significant with medium input integrated crop management. The most energy efficient with average of 2.11 was obtain from medium input integrated crop management that was higher than high input , medium input , low input and organic crop managements of 10.5 % , 42.6 % , 127 % , and 18.5% respectively. According to energy balance in this managements can says that the integrated management in common bean addition to maintaining the bean yield in optimum level , this also Cause significant savings in energy consumption and reduce inputs in the production and consequently increase the efficiency of energy use in this crop management. Keywords: energy efficiency , crop management , common bean .