Distribuição do sistema radicular do pequizeiro com e sem restrição hídrica

Abstract

The objective of this study was to evaluate the distribution of the root system of pequizeiro (Caryocar brasiliense Camb.) Cultivated with and without water restriction.Four plants were selected: two cultivated under irrigation and two in dryland, at 7.1 years of age, cultivated in spacing 5.0 x 5.0 m, in a dystrophic red latosol in Goiânia-GO. The irrigation system used was micro sprinkler with a microsprinkler per plant (service pressure (PS): 10 mca, flow rate q = 48 L h -1, wet radius r = 2 m). Soil and root samples were harvested with the aid of a horizontal direction to the pequi tree stem at distances of 0.40; 0.80; 1.20; 1.60 and 2.00 m, and vertically at 0.00-0.20, 0.20-0.40, 0.40-0.60, 0.60-0.80, 0.80-1, 00, 1.00-1.20, 1.20-1.40, 1.40-1.60, 1.60-1.80 and 1.80-2.00 m. These were air dried, sieved and quantified in terms of length, diameter and density. When cultivated without water restriction the pequi tree presents roots distributed (80%) horizontally and vertically up to 2.00 m, being classified mainly (66%) as very fine and fine. While with water restriction, the roots are up to 1.60 m from the stem, horizontally, and up to 2.00 m vertically, being observed the presence of more developed roots classified (45%) between small and very large.