Resumo

JIMENEZ ESPINOSA, Esequiel Rolando et al. Study irrigation uniformity, in center pivot machine . Rev Cie Téc Agr [online]. 2010, vol.19, n.1, pp. 95-97. ISSN 2071-0054.

The work was carried out in the Unit of Scientific and Technician Development in Pulido, Alquìzar in a central pivot machine of the Otech-Irrimec⁴ enterprise. For the study four tests were developed with different variants for emitters of the type: Spray Nelson D3000K and Spray IIRD. The methodology for the evaluation was Cuban standard NC ISO 11545:2005. The parameters Coefficient by uniformity of Heermann and Hein (CU_h), Coefficient of uniformity of variation by Bremond and Molle (CU_V) and distribution Uniformity (UD_25%) were determined and its graphic relationship with the Area Irrigated Appropriately (ARA). The results threw that the best variant was: "spray IIRD at 1m of height, without regulator of pressure and with counterbalances" where the biggest values CU_h, CU_V, UD_25% and ARA with 82,33%, 77,51%, 68,08% and 56% respectively were obtained. The classification of the irrigation quality also settled down using the percentage of Area Irrigated Appropriately, starting from the obtaining of the CU_h and of the approaches of Tarjuelo.

Palavras-chave : Coefficient of uniformity; distribution uniformity; pivot; spray.