In this study effects of agricultural advisory services on input and output of sugar beet are examined by means compare and estimating the transcendental engineering production function. The empirical results based on the farm level data from 453 sugar beet producers of the main region of sugar beet production (Razavi Khorasan province) in 2008 suggested that agricultural advisory services has a positive and significant effect on sugar beet yield and negative effect on N,P,K fertilizer and pesticide inputs. Sugar beet output in group with advisory services was 0.0673 higher of alternative group. The results also implied that advisory of agricultural engineering had a positive and significant impact on utilization of herbicide, cultivated area, labour, number of irrigation and agricultural machinery rather than alternative group. These results call for more investment in agricultural advisory services through agricultural engineering in rural area and to organize the agricultural graduate students in this context for accelerating the agricultural growth.

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