OK first time rDWC and i followed the lucas formula which ended up being a big mistake and the ppms were high at week 2 veg, over 1k ppm. I identified it as nute burn and replaced all of the water with fresh RODI water ~70ppm about a week ago, no nutes yet. However, the plants still seem to be displaying burn in newer sections. There is spotting on the more severe leaves and the tips are all discolored on many others. The question is, how long will it take for the correction to be noticed in the plants? Other than that one problem with the nute levels, all other parameters look good. Air temp, res temp, CO2 ppm, humidity... everything is good. Plus, the plants seem to be growing fine despite the burn on lower leaves.
they are gone forever however the new growth will be healthy focus on the new growth and when the time comes cut the old leaves off or they will fall off naturally
Yeah i know the damaged parts wont recover but what im asking is whether i should be seeing different leaves with damage after replacing all of the water?
They could be shocked into a lock out mode. With a dose that high at such a early age I would think at least two weeks before you see any improvement. How long has it been? Is it the newer fans burning or the newest top growth? Hmmm... Burning in the newer sections can happen from too low of a rh along side with high nutes. The light raises the leaf surface temperature and causes those area's to transpire more, thus needing to transport more water to those sections, more water is also carrying more nutes; resulting in a burn in the areas of high transpiration. What is your rh? Are you banging them out with wind? That will cause high transpiration and also isn't good if suffering from a nute overdose.
OK thats what i was hoping to hear. Its prolly about a week now. Its newer fans not the new growth. RH is between 50-60%. Yeah they are getting a decent amount of wind too. I'll put the fans on low now.
It appears that even the newer leaves are showing brown around the very tips. I would have thought the newer leaves wouldnt be responding to the nute burn since they blossomed after i switched to clean no-nutrient water.
I would just let her ride for a bit. Brown tips are from over fed, every time, regardless of a ec value. Ec should not be used to determine a nute overdose. Just because your ppm is below what you think would burn them does not tell you what is built up in the roots and tissue. Any pics? I could probably help more if I had a visual.
You can see in the top of the image that there are some leaves poking into frame that have the very tips burnt like brown. They are newer leaves. Some plants have some leaves that are way worse and are actually slightly crunchy. The roots to every single plant look 100% healthy. I dont see any rotting or brownness at all. They look very white. View attachment 5523 EDIT: finally figured out this whole photo upload process
