Efeitos do sistema de irrigação por microaspersão em propiedades físicas e químicas de solos sob cultivo de macadâmia (Macadamia integrifolia Maiden et Betche)

Abstract

This study was realized in three cultivated áreas with (Macadamia integrifolia Maiden et Betche), respectively 1, 4, and 7 years old. The objective was to verify the effect of two forms of water addition to the soil, both through the use of microsprinklers, in the chemical and physical properties of the soil. The mechanisms of watering were: a) by surface, with low impact (upstream from the microsprinkler), and b) by lateral percolation (downstream from microsprinkler). In 240 soil samples were colected within intervals of 10 cm, in two minitrenchs of 40 cm depth, for each one of 30 trees. In general, there were no differences (t test 5%) between the treatments. However, there were tendencies of reduction of clay and organic matter contents for upstream position, as well as a reduction on the concentration of bases and value T, and an increase of the bulk density of the soil.