Variação de pressão na uniformidade da microirrigação: uma avaliação multivariada

Abstract

In irrigation, it is paramount to observe the uniformity of water application. A high uniformity tends to provide a more homogeneous production. Thus, the objective of this work was to use clustering to evaluate the response to uniformity of micro-irrigation subjected to different pressures. The experiment was carried out in two tests, the first with self-compensating KATIF (Plastro Brasil) and IDROP (Irritec) drippers arranged in a lateral line, which in turn was subjected to different levels: 6% upward, 6% downward and at level. Different pressures were applied at the beginning of the row: 0.8; 1.0; 1.5; 2.0; 2.5 bar. The second test was carried out on a bench with Amanco MF2 micro-sprinklers, which were light green, beige and orange with flow rates of 44 L h -1, 51 L h-1 and 112 L h-1, respectively, exposed to the pressures at the beginning of the line of 1.5; 2.0; 2.5 and 3.0 bar. Satisfactory uniformity was observed in both tests, the variables of irrigation uniformity, average flow, pressure at the beginning and at the end of the row were submitted to Cluster analysis using the hierarchical method through the RStudio software. The results showed that in the test with drippers, three groups were formed, in which it could be infered that the IDROP dripper, regardless of the difference in level, had a similar behavior when exposed to low pressures of 0.8 and 1.0 bar. Nevertheless, the KATIF dripper, on upward slope and exposed to low and high pressures of 0.8, 1.0 and 2.5 bar, respectively, showed different behavior. Regarding the test with micro sprinklers, three groups were formed, where it was observed that the light green and beige emitters exposed to a pressure of 1 bar showed similar behavior, while the orange emitter showed a different behavior from the others.