Stickstoff Mangel in der 4. Blütewoche ?

adding a little extra 4 days ago won't make a huge diifference over night... did the progression slow or stop? That is the type of thing you should be focusing on -- rate of change. chlorosis can become green again with time, but more severe damage will not heal. necrotic spots won't heal. Still looks like a nitrogen deficiency. go to 120ppm N from fertilizer and continue to do so.

Absolutely nothing to go on other than visual id say it's uptake of iron. Typically not from a lack of iron in the soil itself, but because the iron is in a form the plant cannot absorb. While the lack of iron in the medium is a possibility, the disruption of its uptake almost always comes down to high pH and nutrient imbalances in the root zone.Low soil temps. And/Or oversaturated medium. High Ca and MG can antagonize iron. A possible long shot is when one is irrigating with "hard" water that has high levels of calcium bicarbonate, the bicarbonate ions can raise the pH of the growing medium over time and directly interfere with the plant's ability to absorb and utilize iron. Hope you get her back in shape, great grow so far! Nice nug formations. Best of luck.