Member of the Month: Mar 2019 - Grow Journal of the Month: Jan 2020
unfortunately, your problem looks exactly like what we have been seeing all around the forums, it appears to be a potassium lockout caused by giving way too much MC. You called that a nice deep green... no, that is an alarmingly too deep of green, showing that you are having a Nitrogen overload, and it definitely is not MegaCrop green.i Have been feeding this girl 6g/g at 5.8/6.2 ph in coco loco at the first sign of cal-mag d deficiency I piped up the .5g suggestion that is common the deficiency did not soread and seems contained but now the plants seems to have hit some other form of defficiencies wich looks like nitrogen to me. I am a bit confused as to hats actually going on. The leaves seems a nice deep green with bearly any burning. I was actually going to scale back the dose but am now a bit worried since the yellowing has occurred.any advice ?
Since you are overloading the plant with N, you are also overloading it with Magnesium and Calcium, which are coming in at the same percentage of overage as the N is. Too much Mg and Ca will lock out Potassium, and that is what your leaves are showing you... a potassium deficiency. Since we know that there is plenty of K in the MC mix, we know that it is not a typical deficiency, but instead, that which is there is being locked out.
My monster plants are getting along fine with 4.5g of MC. I suggest that you immediately cut your MC dosage to 5g and maintain that for several waterings to see if the plant can recover from this over fertilization quickly. The damage you now see will not go away, but if you act now, you can keep it from getting a whole lot worse, but also keep in mind that your plant now is loaded up with 2 or 3 days worth of 6g MC, and its effects will not go away until the plant has had a chance to process all the nutes you last gave it... any changes you make now are not going to be seen for at least a few days.