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Brown spots on all three plants
oppilFstarted grow question 4 years ago
At first just one plant showed some deficit-symptoms (mottling/brown spots), but now all three are really getting worse!
Ph of feeding is always okay (6.3-6.7) , yet the runoff shows 7.0-7.1.
Ec in is always around 1.3. Runoff shows 1.5.... Today I added a little bit of cal/mg...
like
Wontgiveupanswered grow question 4 years ago
You want the Runoff pH to be as close as possible to the feed pH but it is normal to expect a small rise due to buildup in between feeds.
Just like with EC.
Your runoff pH is a bit high so go with lower pH in your feed solution for the next few feeds and if you are really worried you can lower the nutrient dosages but try not to decrease feed solution EC too much in one day.
A good general rule of thumb is to not exceed a change of +/- 0.2-0.3 EC from feed to feed.
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