Mother nature does not require humans to add fertilizer to our ground to grow food. This is a loaded concept heavy with debate. Find out a cheaper and better way to grow your food by devling into the concept of nutrient cycling.
A flood table and tray system is a very simple and mostly handsoff way of growing foods like microgreens, leafy greens, small herbs. This is a great method for larger setups that require turning over seedlings and microgreens.