Evaluation of nutrients bioavailability from fertilizers in in vitro tests

Modern biological fertilizers and biological fertilizers components can release nutrients in bioavailable forms in a controlled manner. Quick evaluation of nutrient bioavailability, essential in the evaluation of quality of fertilizers, is possible to use in vitro extraction tests (conventional, microwave, ultrasonic), described in this article. These tests enable not only total content of nutrients in fertilizer, but also their bioavailability, through simulation of condition occurring in soil solution (e.g. citrate solution).