P or K deficient?

Hello community! I have some plants with their lower and larger leaves are experiencing browning tips and curling. This is day 4 of flower. I'm thinking either P or K. One plant also seems to be stretching quite a bit, it is a sativa but still... don't know if that's genetic or a deficiency problem?



Here's the stretchy sativa... This is also suspected of being male, I plucked 2 small green balls from its middle branches and haven't seen any more balls (it's been 3 days) and the plant itself stinks (good) and there are little white hairs - pistils coming from most of the other nodes but IDFK. Sorry I can't get close pictures of the nodes that are in focus. So we'll see what kind of attention this gets.
View attachment 2505006View attachment 2505007
Thanks all!

Looks like a phosphorus (p) deficiency. The plant looks healthy overall, if it's only the lower leaves I wouldn't worry too much about it but get them closer to the light and start feeding some high P nutes.

So I've got a FF tiger bloom which is 2-8-4 they have had 2 or 3 light Rx's with that, should I increase the strength/gallon?

Yeah it shouldn't hurt. Start with about half strength and slowly work up to the full dosage.

I normally mix up a bit of pk powder and add it at some point during the 1st 2 weeks of flower as it can increase bud sites on the plant.

I've been doing that for 2 weeks getting ready to transition them to flower. Now they're on regular strength nutes.

what light is that ?

150w HPS with a 18" fluro grow tube rated at 7800K for under lighting.