| Summary: | En casas de malla (31°C, 58% HR) se evaluaron tres metodologías no destructivas (capacitancia eléctrica, amperaje, resistencia eléctrica) para estimar la masa radical en caña de azúcar variedad CC 8592. El material vegetal se sometió a diferentes niveles de humedad en el sustrato. Se utilizó un diseño completamente al azar, con 13 repeticiones; las plantas se sembraron en materos plásticos (3 kg) con cachaza - carbonilla (3:1); 24 horas antes de las mediciones se saturó el sustrato con agua. Mediante regresión lineal se obtuvieron las siguientes ecuaciones que relacionaron capacitancia (X) con masa radical fresca (Y): Y = 6.841X - 49.623 (R2 = 0.829, P < 0.001), y con la masa radical seca: Y = 0.9546X - 7.4649 (R2 = 0.545, P < 0.001). La relación del amperaje con la masa radical fresca fue: Y = 0.4138X - 48.194 (R2 = 0.850, P <0.001) y con la masa radical seca: Y = 0.0577X - 7.2575 (R2 = 0.559, P <0.001); este método presentó mayor confiabilidad que el del capacitómetro. El método de la resistencia eléctrica no presentó resultados confiables. ABSTRACT Indirect methods to estimate the root biomass in sugar cane, cultivar CC 8592. In greenhouses (31°C, 58% RH) three nondestructive methods were evaluated (electrical capacitance, amperage electrical resistance) to estimate the root biomass. There was used a completely randomized design, with 4 treatments and 13 replications, the plants were seeded in plastic pots (3 kg) using a mix of cachaza and fine coal (3:1); 24 hours before the measurements the substrate was saturated with water. By means of linear regression were obtained the following equations that relate fresh root (Y) and capacitance (X): Y = 6.841X - 49.623 (R2 = 0.829, P < 0.001); and dry root biomass to capacitance: Y = 0.9546X - 7.4649 (R2 = 0.545, P < 0.001). The relation of fresh root biomass and amperage was Y = 0.4138X - 48.194 (R2 = 0.850, P < 0.001) and dry root biomass with amperage, Y = 0.0577X - 7.2575 (R2 = 0.559, P < 0,001), this method presented greater reliable than the method that uses the capacitance meter. The method that uses electrical resistance did not present reliable results. Key words: Sacharum sp estimation of radical biomass, capacitance meter, amperage, electrical resistance.
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