Sudan'. irrigated subsector is the largen in lub-Saharan Atria. Firming is practised under scheme?mandated rotation with highly centralized decision making. Under this system. labour is the major input for which the lenant has allocation flexibility both doring the season and cross the three crops grown, sorghum, cottom and groundnuts. This paper analyzes the risk attributes of the production technology and measures farmer's attitudes towards risk in the irrigation schemes of Sudan. Stochastic production functions are specified where risk increasing and risk reducing input effects are allowed. Single-equation and systems procedures are employed to estimate the parameters of the firs two moments of the distribution of crop yields. The analysis supports the existence of aggregate indices for weeding and harvesting labour for cotton and sorghum while the hypothesis of separability in hired and family labour is rejected. The form of labour contract for hired labour is found to have significant implications on its production risk effects. When hired labour is paid in cash, production risks increase, as is the case with cotton and sorghum. When sharecropping takes place, as in groundnuts, production risks decrease with increased labour use. Supply behaviour of the tenant farmers under production uncertainty is simulated using a farm programming model.

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