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Losing herbicide selectivity is a permanent risk in high-value crops, which is why it is important to have alternatives that mitigate the effect on the physiology of stressed crops. A greenhouse and a field experiment were performed to evaluate the behavior of hidroxy-carboxylic acids (HCA) as an organic bio-regulator in tomato plants that were treated with Metsulfuron-Metil and Metribuzine at regular and excessive doses. In the greenhouse experiment, the quantum efficiency (Fv/Fm), chlorophyll content, stomatal conductance and CO2 exchange were evaluated; in the field experiment, we evaluated the foliar area, root growth, net assimilation rate (NAR), relative growth rate (RGR) and yield. Statistically, the Metsulfuron-metil (regular and excessive rates) did not affect the chlorophyll content, but it decreased the quantum efficiency and CO2 exchange in 80% and 100% of the plants, which was alleviated by the bio-regulator application. During the first month after the application, the hidroxy-carboxylic acids did not have the decreased root growth that was seen after the Metsulfuron application, and aided in the recovery of the NAR and RGR, resulting in a better fruit set. The Metribuzine affected the CO2 exchange significantly during 15 days after the application (daa) of treatments whereas the excessive dose application impacted the quantum efficiency for 7 daa and was responsible for leaf fall at 30 daa and 20% less production. All of the excessive Metribuzin dose injuries were mitigated by the bio-regulator application, reaching similar values as the control plants. La FAO clasifica al tomate (Solanum lycopersicum L.) como la hortaliza mas importante en el mundo, ocupando cerca de 4 millones de hectareas al igual que estima para 2013 una produccion anual de 683.538 t en aproximadamente 16.700 ha, convirtiendo a esta hortaliza en el producto mas importante en volumen (Faostat, 2013). La fitoproteccion del cultivo incluye el manejo de artropodos, hongos y plantas no deseadas. La presencia de malezas durante los primeros 45 dias (d) despues de trasplante afecta la calidad y el rendimiento hasta en un 90% (Adigun, 2005) por lo cual es necesario un plan de manejo integrado. Las solanaceas, incluyendo el tomate, son plantas susceptibles a los herbicidas, por lo cual las posibilidades de dano al cultivo son permanentes, debido tanto a la baja selectividad como al manejo y la aplicacion del producto (Ormeno et al., 2002). En Colombia, el manejo de malezas en el sistema de produccion de tomate comprende el uso de practicas culturales como desyerbas, aporques y aplicacion de Metribuzina como la unica molecula selectiva registrada en el pais ante el ICA para el control de especies latifoliadas en postrasplante del cultivo (ICA, 2016) De otro lado, la investigacion para el uso de otros herbicidas ha sido extensa en paises de mayor produccion de tomate. En Chile, buscando alternativas para la rotacion de Metribuzina, se

Efecto de ácidos hidroxicarboxilicos en la biorregulación del estrés causado por herbicidas en el cultivo de tomate