The determination of the dry mass of all substrate pots by drying in a ventilated oven at 60°C (Heraeus, Hanau, Germany) for 7 days at the start and close of lettuce cultivation authorized the calculation in the mineralized natural and organic make a difference in the course of the experiment. https://steel-watch-band66541.get-blogging.com/33591991/the-2-minute-rule-for-ventilation-system