تحليل اقتصادي مزيت نسبي توليد در مراتع طبيعي مراتع دست كاشت و كشت گندم و جو ديم در اراضي شمال خراسان مطالعه مورد شهرستان بجنورد

The arid and semiarid regions of the world was stimatedʹ44.7 million square kilometers, and approximately 39 percent of this area is semiarid. Majority of this semiarid lands are not suitable to crop production but can be used as grazing lands. The lands of north Khorasan are similar to condition of semiarid regions. Farmers prefere dryland farming and these continuous practices, will increased soil erosion, in the long time.In this line, determination of landuse,including preferance, pasture [(Medicago sativa), (Agropyron desertorum) seeding], dryland farming and range forage production are important. Collected data by Research Station of Natural Resources in North Khorasan, during 1993-1998 were used For determination of economical production of comparative advantage. Investigation on forage yeild of pasture and dryland farming were done yearly and each two years respectively in randomized complete block design with three replication. The results indicated that the econonomical production of pasture had the most preferable among other land uses. In addition, dryland farming production had more preferable than rangeland. In this area and similar regions, for the sustainable development of agriculture and natural resources, establishment of pasture and dryfarming in alternate strips, for 6 years rotation, are proposed.