leaf deficiency.

hi. I'm a newbie. i have got some kind of leaf deficiency. After googling i think is Phosphorus. please correct me if I'm wrong. how do i treat this, do i feed it as usual + addal little extra P or do I only feed it with water and P. I grow in soil and are in week 4 flower. Every thing eles is god. Humidity 45-50% Temp 12/h 18°and then 12/h 24-26° PH 6,5.

I live off the grid. What do you recommend all growers have at home to confront leaf issue
Regards
KissKorv

approching nute burn... IMO

miss a few feeds

check you have dialled your temps in well see the brown leaf tips

good luck

Yellowing on the tips and margins is usually a K issue.