Comportamento do sistema radicular da mangueira em Podzólico Bruno vermelho-amarelo distrófico sob irrigação por sulcos na região do submédio São Francisco.

Abstract

This study was carried out at Frutivale Farm, Juazeiro-BA, Brazil, in a mango yard, cv. Tommy Aktins, with four years of age and plants with 4.70m of heith. Ditches were open in one of the quadrants explored by the plant, using the monolite methods described by Kolesnicov (1971). Regarding the horizontal distribution of the roots in the 0-30cm layer, it was found that 91.34% of the roots for water and nutrient absorbing and 100% of supporting roots were concentrated from 0 to 150cm away from the plant, when the row spacing is taken into consideration and 88.43% and 100% of those roots, respectively, were situated at the distance from 0 to 200cm in relation to plant spacing. In the layer from 31 to 120cm of depth, the distribution of water and nutrient absorting roots showed the same pattern as in the superficial layer; in the layers from 61cm down, there were not found supporting roots. Regarding the vertical distribution of the roots, it was found that the concentrattions of water and nutrient absorbing roots decrease as the soil depth increases, being that 84.37% were concentrated in