The purpose of this study is to investigate comparative advantages of corn in comparison with other competitor crops. To do so, Linear Programming, to 2004-2005 data related to classic index (DRC) in Kermanshah province was applied. Results showed that corn has comparative advantages in all regions of Kermanshah province while in optimal cultivation pattern of 37.5 percentages of regions in exi...

In agricultural capacitated field operations, i.e. operations where material is transported into the field (e.g. seeding, spraying and fertilizing) or out of the field (harvest), a number of routes are needed for a primary unit to cover the entire field due to its capacity constraint. Hence, the operation of a primary unit must be carefully planned to improve the field operation efficiency. In ...

although the physiological and morphological differences between intercropped species caused a higher wue possibly, most researches on multiple cropping systems have focused on yields and the resources use efficiency (water, light and nutrients) has been less investigated. in addition, optimal use of nitrogen is important to attain sustainable agriculture due to its role in wue improvement. the...

Abstract Balancing the benefits and environmental degradations of reservoirs is a challenging issue in reservoir management. The present study proposes evaluates an integrated framework to optimize operation which hydropower loss economic irrigation supply are minimized while ecological at downstream river alleviated. ecohydraulic simulation was utilized structure optimization. Reservoir losses...