Yellow leaves

Nitrogen is still needed in fair levels week 1-4 flowering there is still a lot of vegetative growth going on should be half bloom and half veg formula up to week 5

She is hungry for N , Nitrogen deficiency ,start her feeding also more PK too and some calmag .

Thanks guys completely forgot to update feeding chart I'm using 0.5ml per l of bio bizz bloom advanced nutrients big bud and bud candy and 1ml per l of cal mag

Die Pflanze braucht in der Blüte andere bzw. mehr Nährstoffe. Da die Blüte das Lebensziel jeder Pflanze ist, werden bei Defiziten die mobilen Nährstoffe aus den Blättern verbraucht. Gib ihr viel Kalium, Phosphor und etwas Stickstoff. Vergiss aber nicht Magnesium, Calcium, Silizium und Schwefel. Viel Glück!

looks definitely like a nitrogen deficiancy. light burn would usually appear on the top. since some older leaves are longer exposed to the light it can also happen from bottom, but in this case i would still say 100% nitrogen deficiancy. little hint: you can tell the difference by picking an yellow leaf. if you can pick it from the plant easy, its nitrogen defiaciany., if it is hardly attached to the stem and not easy to pick, its light burn.