Yellow leaves? Look at WHERE the yellow starts before adding more fertilizer.
Free app that warns you when iron is missing: https://play.google.com/store/apps/details?id=com.hydro.calc&referrer=utm_source%3Ddailymotion%26utm_campaign%3Dyellow_short
Full video: Why Is My Hydroponic Lettuce Turning Yellow? (in this playlist)
#hydroponics #shorts
