Abstract

A method for the evaluation of adequacy, distribution and application efficiencies of border irrigation is proposed. A mathematical model for the simulation of surface runoff and infiltration is applied in order to analyse the waterings carried out according to traditional practice in the lower Po valley and according to systematic, full and deficit irrigation, on plots cropped with clover ley and spring maize. In the application of the model, it is assumed that the water stored in the root zone may be identified with the readily available water. The computations make it possible to analyse the traditional parameters and to find their optimal values for a selected adequacy, i.e. for a selected percentage of the length-of-run adequately irrigated. The model shows that the traditional practice causes an over-irrigation and that significant water savings of nearly 11% may be made in comparison with the experimental values.

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