ANÁLISE GEOESTATÍSTICA DA DISTRIBUIÇÃO DE ÁGUA NO SOLO, APLICADA POR SISTEMA DE IRRIGAÇÃO POR MICROASPERSÃO

Abstract

This research performed an evaluation of the water distribution on the soil surface and in its profile in a subunit irrigated by microsprinkle cultivated with Annona muricata L., with the purpose of verifying the spatial distribution and quantification of the water availability in the soil profile. The data were collected in 28 spaced emission points of 10 x 24 m, forming a mesh for application of the geostatistics. In the surface evaluation it was determined the coefficient of emission uniformity and the irrigation efficiency, while in the subsurface evaluation the water availability was esteemed in three layers of the soil profile, 0-20, 20-40 and 40-60 cm, one and twenty-four hours after the irrigation, using a neutrons probe. The coefficient of irrigation uniformity found was of 84.69% with an irrigation efficiency of 76.22%. It was verified that, twenty-four hours after irrigation, the water content in the most superficial layers of the soil profile is below the correspondent to the wilting point, while in the deepest layers the water content overcomes the maximum capacity of soil water retention, in other words, humidity superior to field capacity.