Condutividade elétrica da solução fertilizante na rede hidráulica de um sistema de irrigação por microaspersão num plantio de uva (Vitis vinifera L).

Abstract

The objective was to determine the uniformity of application of water and fertilizer solution through measures of electric conductivity for different times of application and distances the injection point, in hydraulic net of the micro-sprinkler irrigation system in crop grapes. The fertilizer solution was prepared with 10 kg of potassium sulfate diluted in 100 L of irrigation water, what electric conductivity of fertilizer solution of 872,33 mS cm-1. The irrigation system presented coefficient of medium variation of 0,122, and the coefficients of application uniformity were between good and very good (0,89, 0,84 and 0,87); even so the fertilizer solution had coefficient of medium variation of 0,053 and all the other performance indexes were very good (0,96, 0,94 and 0,95). The times at the beginning and end of the application the fertilizer solution and the estrangement to the application point, influence in the electric conductivity and consequently in the concentration of fertilizer in irrigation water.