The resolve with the dry mass of all substrate pots by drying in a ventilated oven at 60°C (Heraeus, Hanau, Germany) for seven days at the start and end of lettuce cultivation authorized the calculation on the mineralized natural matter in the experiment. This technique was applied based on the https://mini-variable-frequency-d77542.uzblog.net/5-essential-elements-for-ventilation-system-46862142