استفاده از تابع هزينه ترانسلوگ چندمحصولي در تخمين همزمان توابع هزينه و تقاضاي نهاده هاي كشاورزي (مطالعه موردي زاينده رود اصفهان )

Application of translog cost function and multiproduct cost function for estimating cost and inputs functions in agriculture: Case study of Zayanderoud,s Esfahan

The main purpose of the present study is to investigate the effects of inputs in production of irrigated wheat and barley. To do this the Shephardʹs Lemma, translog cost function and translog multiproduct cost function along with seemingly unrelated rergession iterative are used in order to estimate the demand function for water, chemical fertilizer, labor and agricultural machinery. Data were obtained from 210 questionnaires, filled by farmers producing wheat and barley in Zayanderoud watershed during 2000-2001. The results showed that the translog cost function efficiently modeled the data. Moreover, the water as an major input can be considered as a complement for labor and substitution input for machinery. The value of elastcity of demand water is more than uint, therefore, it indicates demand water is elastic.