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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  022197,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.9606) @2002
Authors:   Wagner Walker de Albuquerque Alves, José de Arimatéa de Matos, Carlos Alberto Vieira de Azevedo, José Dantas Neto, Hugo Orlando de Carvallo Guerra
Keywords:   Fecal coliform, watershed, streamflow, variability

Seeking improvement in the irrigation management in the irrigated perimeters of the Northeast region of Brazil, it was performed a surface and subsurface evaluation in a field irrigated by microsplinkler and cultivated with Annona muricata L. The data were collected in 28 emission points spaced 10m x 18m. In the subsurface evaluation the soil water availability were measured after the irrigations by using a neutron probe. The evaluation results presented a uniformity irrigation coefficient of 84.69%, an application efficiency of 76.22% and a statistical uniformity irrigation coefficient of 88.82%. In the spatial statistics, the adjusted mathematical models for the semivariance were spherical and exponential, respectively, for discharge and pressure. The nugget effect (Co), sill (Co+C) and range (a) were l L h-1, 33 L. h-1, 45 m and 0.37 kPa, 1.2 kPa, 218 m, respectively, for discharge and pressure, and spacial dependence (Co/(Co+C)x100) was strong. In the layers of 0-20, 20-40 and 40-60 cm, after the irrigations were found an average for the water depth equal to 40, 42.2 and 46.1 mm, respectively. According to the geostatistics analysis, the best mathematical model for fitting the semivariance of each soil layer was linear, except for the layer of 20-40 cm that was exponential. The values of nugget effect, sill and range for the water depths after the irrigation, in the layers of 0-20, 20-40 and 40-60 cm, were, respectively, 37.1 mm, 89.2 mm, 98.9m, 66 mm, 170 mm, 199 m, 114 mm, 135.5 mm, 98.9m, and the spacial dependence in the layers of 0-20 and 20-40 cm were moderated and for the layer of 40-60 cm weak.

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