A drop in ph like that COULD be a sign of dying, diseased roots.....how are yours looking? I'm not saying it IS......only that it COULD be.
Weedhound Reviewed by Weedhound on . Ph goes down as EC goes up? The details - two Oasis feminised plants growing in a NFT system with a 20 litre reservoir, with about 3 weeks flowering left to go before harvest. Now, a technical question - while my plants are looking fine these days, I've noticed that the ph these past four days or so keeps sliding down to around 4 every morning, and my EC meter keeps reading 2.3 or 2.4 despite the fact that I haven't put any nutes in the res in some time. Now, I've been bringing the ph up to around 5.5-5.8 each day by Rating: 5