Leaves turning purple (necrosis)

Hello,

Im at 50 days flowering but this strain takes 75 days so I still have 25 days (probably 30) or more. Leaves first started yellowing on borders and then leaves turned purple and are dying. I added bat guano to my soil and Im also using bio bloom from biobizz and blackstrap molasses. Temperatures are 18º celsius minimum (night) 31º celsius max (day), 400W, biobizz nute line + bat guano.

Is this overfertilization or are they hungry? I use half of recommended dose and added plenty of guano to the soil, so im leaning more towards overfert rather than underfert.

Thanks in advance

that my dear sir is nute burn/ over fertilizing
half strength is still to strong, always use quarter strength and build up to half strength each week till you find the write amount your girls like

hibok said:

that my dear sir is nute burn/ over fertilizing
half strength is still to strong, always use quarter strength and build up to half strength each week till you find the write amount your girls like

Click to expand...

Hey thanks a lot for your answer. It's probably from the bat guano, so I guess it's a potassium or phosphorus toxicity, not sure which one.

100% nute burn mate but i cant tell what, Have to agree with hibok i always start at about half and build it up from there, better to be safe than sorry