A system for evaluating the hydric state of a plant, comprising: - at least two electrodes (12A, 12B) separated a certain distance from each other, and adapted for its insertion, to a given depth, into the trunk of a plant to establish a galvanic contact with the plant; - at least one temperature sensor of the electrodes; - an electronic unit, operatively connected to the two electrodes (12A, 12B) and to the temperature sensor of the electrodes; and - a processing unit including a memory and at least one processor, the system being characterized in that: - the electronic unit includes a voltage measurement module configured to: - apply, during a first time interval, an electric voltage, with a given polarity, on the at least two electrodes (12A, 12B); - invert, sequentially, during a second time interval, said given polarity; and - measure voltage values resulting from said application of electric voltage in both polarities carried out during said first and second time intervals; wherein the temperature sensor of the electrodes is configured to, simultaneously with said measurement, measure a temperature of the electrodes (12A, 12B); and wherein the at least one processor is configured to: calculate an electrical conductance value from the applied electrical voltage and the resulting measured voltage values, and infer a value relative to the hydric state of the plant by processing the calculated conductance value and the measured electrode temperature. - at least two electrodes (12A, 12B) separated a certain distance from each other, and adapted for its insertion, to a given depth, into the trunk of a plant to establish a galvanic contact with the plant; - at least one temperature sensor of the electrodes; - an electronic unit, operatively connected to the two electrodes (12A, 12B) and to the temperature sensor of the electrodes; and - a processing unit including a memory and at least one processor, - the electronic unit includes a voltage measurement module configured to: - apply, during a first time interval, an electric voltage, with a given polarity, on the at least two electrodes (12A, 12B); - invert, sequentially, during a second time interval, said given polarity; and - measure voltage values resulting from said application of electric voltage in both polarities carried out during said first and second time intervals; wherein the temperature sensor of the electrodes is configured to, simultaneously with said measurement, measure a temperature of the electrodes (12A, 12B); and wherein the at least one processor is configured to: calculate an electrical conductance value from the applied electrical voltage and the resulting measured voltage values, and infer a value relative to the hydric state of the plant by processing the calculated conductance value and the measured electrode temperature. - apply, during a first time interval, an electric voltage, with a given polarity, on the at least two electrodes (12A, 12B); - invert, sequentially, during a second time interval, said given polarity; and - measure voltage values resulting from said application of electric voltage in both polarities carried out during said first and second time intervals; wherein the temperature sensor of the electrodes is configured to, simultaneously with said measurement, measure a temperature of the electrodes (12A, 12B); and wherein the at least one processor is configured to: calculate an electrical conductance value from the applied electrical voltage and the resulting measured voltage values, and infer a value relative to the hydric state of the plant by processing the calculated conductance value and the measured electrode temperature. wherein the temperature sensor of the electrodes is configured to, simultaneously with said measurement, measure a temperature of the electrodes (12A, 12B); and wherein the at least one processor is configured to: calculate an electrical conductance value from the applied electrical voltage and the resulting measured voltage values, and infer a value relative to the hydric state of the plant by processing the calculated conductance value and the measured electrode temperature. calculate an electrical conductance value from the applied electrical voltage and the resulting measured voltage values, and infer a value relative to the hydric state of the plant by processing the calculated conductance value and the measured electrode temperature.