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ORANGE ROOT SYSTEM DISTRIBUTION UNDER CONTROLLED DEFICIT IRRIGATION

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131620475,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131620475) @2013
Authors:   Regina Célia de Matos Pires, Marcos Antonio Frateschi Lima, Andre Luiz Barros de Oliveira Silva, Augusto Yukitaka Pessinatti Ohashi, Jose Antonio Quaggio
Keywords:   Root system; trickle irrigation; citrus.

Abstract. The aim of this work was to evaluate the root system of “Natal” orange grafted onto Citrumelo-Swingle, at 6 years of age, submitted to a controlled water stress applied by drip irrigation system. The field experiment was installed in a randomized block with 3 treatments with 4 replications each, totalling 12 plots. The irrigation was applied by drip irrigation system daily and suspended on rainy days. The treatments consisted of different irrigation regimes: T1: optimal irrigation dose (100% of crop evapotranspiration - ETc), T2: 60% of ETc, T3: 20% of ETc. The methodology adopted consisted of counting the intersections of roots on a 0.05 x 0.05 m square frame on a pit which is 0.80 m deep and 1.0 m long perpendicular to the plant line. The roots in the soil profile were painted before the counting. Afterwards, Tennant (1975) methodology was used to estimate the root length. According to the results and conditions of the present experiment, the effective depth of the root system of Natal Orange grafted onto Swingle citrumelo was observed up to a depth of 0.6 m. It is important to highlight the high concentration of the roots observed between 0.10 and 0.20 m away from the dripper.

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