The present study was conducted in the Saqqez city of Kurdistan province, Iran, in order to study technical efficiency of Barely farmers. The data were collected from both rainfed and irrigated farms in three different areas (mountain, semi-plain and plain), based on two stage cluster random sampling, for agricultural year 2003-2004. In total 210 farmers were interviewed. With respect to the coefficient of multiple determinations (R2) of estimated transcendental production function for rainfed farms, the variables included in this model are able to explain 99.7% of variation in the average production of rainfed Barely per hectare. The variables such as Farmyard Manure, negatively, machinery and Phosphate, positively, were significant. The estimated transcendental production function model for irrigated farms showed that the variables included in this model were able to explain 80.6of variation in the average production of irrigated barely per hectare. The significant variables in the estimated model were Phosphate, nitrogen, seed, human labor and Machinery. The average of technical efficiency for rainfed farms in the mountain, semi-plain and plain areas was 0.758, 0.790 and 0.787 respectively. The average technical efficiency for the entire rainfed farms area was 0.782. In irrigated farms, the average of technical efficiency in mountain, semi-plain and plain areas was 0.772, 0.740 and 0.754 respectively, and for the entire area was 0.758. This showed that rainfed and irrigated barely farmers were almost technically less efficient.
