Sistema radicular do porta-enxerto IAC 572 ‘Jales’ sob niágara rosada nas condições do cerrado goiano

Abstract

The knowledge of roots distribution in soil is fundamental for agricultural production, since it allows performing the most appropriate management in each stage of development. The objective of this work was to evaluate the roots distribution of rootstock of vine plants IAC572 'Jales' under Niagara rosada cultivar in cerrado of Goiás at two plant ages. The evaluated plants were located in areas of dystrophic Red Latosol, arranged in spacing 2.5mx2.5m. Root thickness and density were determined from soil samples collected at five distances of the stem (0.25, 0.50, 0.75, 1.0, and 1.25m) and five depths (0.0-0.20m, 0.20-0.40m, 0.40-0.60m, 0.60-0.80m, and 0.80-1.0m). A completely randomized design was used, in a triple factorial scheme 2x5x5 (ages x distances of the stem x depths), with three replications. The age of the plants did not influence the roots density. The finer roots with a diameter of less than 2mm are concentrated in 0.0-0.20m layer. Thick roots with a diameter above2mm are concentrated up to 0.50m away from the trunk and at a depth of 0.20-0.40m. The effective depth and distance of the root system (80% of roots concentrated) were found at 0.60m and up to 1.00m, respectively, already from the second year old.