The dedication with the dry mass of all substrate pots by drying in a ventilated oven at sixty°C (Heraeus, Hanau, Germany) for seven days in the beginning and conclude of lettuce cultivation permitted the calculation from the mineralized organic matter over the experiment. This technique was used in accordance with https://3d-glock-backplate66431.full-design.com/what-does-ventilation-system-mean-75487127