• La gula nunca es buena: Gran parte de la nutrición en piña se hace por vía foliar utilizando soluciones de fertilizantes que pueden comprometer la sanidad del cultivo si no se manejan adecuadamente.
• Estudio de caso: Se logró determinar el umbral crítico de Conductividad Eléctrica (CE) de las soluciones fertilizantes del cultivo de piña para poder establecer rangos seguros de aplicación y evitar daños directos e indirectos sobre las plantas.

The effect of Electric Conductivity (EC) as an indicator of the risk of phytotoxicity in fertilizer solutions applied on a pineapple crop (Ananas comosus VAR MD2) was evaluated. The applied commercial fertilizer cocktails have EC range between 45 and 130 mS/cm field observations have intuited that there are some negative effects of these cocktails due to high salinity and is expressed with foliar wound. The objective was to determinate the critical range in terms of EC of a solution that causes phytotoxicity in pineapple plants. EC known from 0 to 150 mS/cm with a scale of 10, sixteen treatments were established in plots with four repetitions each. These plots received five foliar applications from fifteen weeks old with terrestrial equipment. Evaluation was developed a week after each application with systematic sampling, also we got track of the degree of severity and number of injuries per leaf and plant, obtaining the percentage of incidence of injuries and severity index. The results show treatments applied with  40 mS/cm present phytotoxicity on injury form in the groups of leaves D and E. These burnings or injuries increase the incidence at higher salt concentration reaching a 100% incidence in treatments with 100 mS/cm. In addition, by raising the recurrence of applications increases the incidence of injuries up to 15% and the severity index rate to values ​​of 100 units, therefore it is possible the plasmolytic effect on the leaf is cumulative even with the same salt concentration or EC.