2nd grow, phosphorus deficiency?

When I read about phosphorus deficiency it mentions purple, but I never see purple.

Soil with organic nutes.

Happens in veg and flower, not much but enough that I wanna figure it out.

tia




View attachment 2951302
21 days in flower

Are you talking about the little patches of yellowing?

Not phosphorus def.

http://growweedeasy.com/phosphorus-deficiency-cannabis

OK, thx, good to know.

Thx 4 the link.

Now I'm wonder about heat stress.



My humidity had been below 20% so that may have contributed.

Thx again.

fso1000,
20% is a little low. 40% is better. Is it too warm in your grow room? There are so many parameters and threads like this are limited. Sometimes it just becomes a matter of best guess. How is your water? Very important issue. And all the other endless possibilities. Pots too small? Not enough drainage? Ph issues. And so on. Don't overfeed is the most important thing I can say to you. So many nute burn and lockout issues here from over-feedings. Make sure they get a good wet dry cycle. The problem certainly doesn't appear to be severe. So try to keep everything on track and see how it develops. Just got home and am a little drunk...so that's all I have for now.
JD

IMO- white leaf tips could be a sign of Magnesium Deficiency
Yellow leaf tips could be a sign of Over Fertilization.
The dead leaf Margin could be a sign of Calcium Deficiency.
Your leaves curling upward is also a sign of a Magnesium Deficiency.
Older leaf tips will curl down ward could be a sign of over fertilization, or Phosphorus Deficiency.

Make sure your pH is in Range for the growing medium your using.

Good Luck on Your Grow.