COMPARAÇÃO DE EQUAÇÕES PARA CÁLCULO DA UNIFORMIDADE DE APLICAÇÃO DE ÁGUA PARA DIFERENTES SISTEMAS DE IRRIGAÇÃO

Abstract

It was aimed, in the present work, to compare the equations of calculation of the application uniformity of water and that they are related to the concept of area being adequately irrigated (ABAI), for several irrigation systems. The systems of conventional sprinkler, central pivot with originators type lepa, central pivot with conventional originators, microsprinkler and drip irrigation. It was evaluated 20 equipments by means of the test of uniformity of water distribution. The used equations were: coefficient of uniformity of Christiansen (CU), of distribution (DU), absolute (UA), statistical (UE), of Hart (UH), of Benami and Hore (UBH) and standard of HSPA efficiency (DH). In each evaluation, ABAI was obtained to generate the coefficient of regression of the straight line. For statistical analysis, it considered CU and DU the equations pattern for sprinkler and trickle irrigation, respectively. The comparison was with aid of the test “t”. Except for CUBH, all the other equations presented relationship with the concept of ABAI. For the sprinkler irrigation, the uniformity values calculated by CU didn’t differ of the values calculated by UBH and they went larger to the calculated by the other studied equations. For the trickle irrigation, DU didn’t differ of the values found by UH and DH, and they presented larger values the other appraised equations.