Been fighting with this issue for about a year now. Been growing lettuce and radishes mostly radishes. When the radishes would germinate they would burn up and die thought maybe light was too bright so I changed to the lowest light setting but it didn’t make a difference except for leggy plants.
Added potassium with no change.
Iron is between 1ppm and 2 depending on time tested.
ph 7
temp 72
nitrate 5-10ppm
any suggestions?
thanks.