Uniformidade Da Umidade Do Solo Para Diferentes Espaçamentos Em Um Sistema De Irrigação Por Aspersão Convencional

Abstract

Usually the sprinkler irrigation systems are dimensioned based on parameters measured on the soil surface, but as the plant consumes the water stored in the soil, the dimensioning should be based in evaluations of the soil profile water distribution. Based on the above, this work aimed evaluate the uniformity and efficiency of a conventional sprinkler irrigation system under field conditions, comparing the results above and below of the soil surface, with prospects for system design. Thus, it was realized the uniformity standard test using an isolated sprinkler, installed in the center of a grid of collectors, based in standard procedures.In addition to the precipitated depth information, it was determined the infiltrated depth by the difference between the moisture after and before the irrigation, that was a result from the spatialization (kriging) of the information sampled from certain points from the mesh collectors, using the Surfer 9.0 software. In addition to determining the soil moisture before and after the irrigation, it was determined the soil moisture four and eight hours after the test, aiming to evaluate the water redistribution process in the soil assessing the data uniformity without overlap. It was observed that the methodology was efficient on the conventional sprinkler irrigation system, in which the use of infiltrated depth information resulted in a analysis more trusted, showing the better layout of the equipment in field, reflecting in the economic parameters of the project.

Uniformity of Precipitation and Radial Profile of the Super 10 Sprinkler at Different Operating Pressures

“…The values of UC and UD were evaluated as proposed by Mantovani [12] and according to Tables 6-8, it can be seen that for the vast majority of data UC and UD values decreased with increasing spacing sprinklers for all pressures and for three different nozzles reviews, which corroborates similar findings by Faria et al [16], Martins et al [1] and Ribeiro et al [17]. Table 3.…”

“…As to the recommendations of spacings, it can be seen in Table 7 and Table 8 that for the yellow and blue nozzles, the best UC and UD results were obtained for the spacing 10 × 10 m, at pressures of 30, 35 and 40 mH 2 O. The pressure of 25 H 2 O presented results classified as "good" as proposed by Mantovani [12], however it is worth emphasizing, as Ribeiro et al [17], Rocha et al [18] and Rezende et al [19], that the water redistributes in the soil over time because of its tendency to move from wetter regions to the lower humidity, increasing the uniformity and thus the UC and UD indexes.…”

“…According to Ribeiro et al [17], greater spacing will result in fewer emitters in the lateral line reducing flow and pipe diameter and, consequently, the energy consumption of the pumping system; as for the green nozzle (Table 6), high distribution uniformity was obtained in 12 × 12 m spacing. Corroborate the results found by Yacoubi et al [20] and Martins et al [1], who have reported the influence of the pressure on the uniformity of irrigation systems.…”