Yellow leaves since 1 week

Terra Flores has a 2% N usage at 5 ml, the product claims: substrate mid EC: every watering of 5 ml substrate high EC: 1 to 3 waterings per week (1 with nute 1 without is the best way in my humble opinion) it could also be a magnesium deficiency when looking at some of the leaves, so if you have a cal mag usage, the lowest dose for the period you're in according to the manufacturer. if you use Terra Flores as the brand suggests, you should use less PK to avoid a lockout. BTW, you use Sugar Royal which has 9% N, use it at half dose 2 times per week and it should be fine. 1 watering with TF 4 ml, next Sugar Royal + PK 13/14 (half dose both), next TF 4 ml...

hey there Ju_Bps , It could be a problem of fertilisation actually, something like a K (potassium) issue. This you can see from the colorful discoloration . I think it could actually be an overfertilisation problem. That's because the PK booster is quite strong. Just reduce the PK for one or two weeks for this plant, hopefully the nutrient profile of the medium will equalise a little bit and the plant will recover. hope this helps ! 🚀