'N Ontleding Van Die Risikodoeltreffendheid Van Besproeiingskeduleringstrategiee Vir Koring In Die Benede P.K. Le Rouxdamgebied Met Behulp Van Veralgemeende Stogastiese Dominansie

The purpose of this article is to use generalised dominance as criterion to evaluate the risk-efficiency of irrigation scheduling strategies for wheat in the area below the P.K le Roux Dam. Wheat yields for five irrigation scheduling strategics, differing in respect of sophistication, were simulated for eleven years by means of the PUTU9-87 model on soils with profile available water capacities of 45,100 and 160 mm. The annual fixed and variable irrigation costs of a 60-hectare centre pivot with a gross application capacity of 12 mm per day and a static pumping height of 10 metres on sandy and clay soils were estimated by means of a computer programme. Generalised stochastic dominance was used as criterion to select risk-efficient irrigation scheduling strategies for wheat. Robinson's computer programme was used for the analyses. On an enterprise level it was found that decision-makers who fall into different categories of risk sensitivity differ in respect of the choice of irrigation scheduling strategy which maximises their particular preferences. In general, a riskaversive farmer prefers a scheduling strategy that applies more water more quickly, in contrast to a risk-seeking farmer.