Coeficientes de uniformidade em sistema de irrigação por gotejamento

Abstract

The distribution uniformity is critical in assessing the performance of irrigation systems, and the use of correct method becomes deciding factor. The objective of this study demonstrate the discrimination of uniformity of water application for different methods in surface drip system and subsurface. The experiment was conducted in a bench trial in a greenhouse installed in the experimental area of the Federal Institute of Education, Science and Technology Goiano Campus Rio Verde. The experimental design was completely randomized analysis in scheme of split plot 6 x 20 with 10 repetitions, composed six plots distributions of solid particles and subplots 20 trials. The experimental unit consisted of PVC containers with dimensions of 0.1 m x 0.6 m (D x C), each container containing a dripper. Were made the Calculations of flow and uniformity of water application using the coefficients Christiansen (CUC), statistical (CUE), distribution (CUD), absolute (CUA), Hart (CUH) and standard efficiency of HSPA (UDH). The CUA was most discriminating in surface condition while CUC had greater discrimination in subsurface condition. The coefficients compared to each other, in descending order, presented the following classification of the percentage of discrimination superficially: CUA, CUC, CUE, CUH, UDH and CUD, already subsurface CUC, CUA, CUH, CUE, UDH and CUD.