Week 5 flower gets me everytime.

Hi all, I'm wondering if you can tell me what this deficiency may be. I'm thinking its a Cal/mag deficiency but I also may be underfeeding during flower as well. I'm just not sure. Here are a few pics.

This is a quick flowering strain, around 9 weeks. Its very possible the deficiencies shown are natural senescence, (leaves fading towards the end of flower) but I'm stumped. If anyone can tell what the yellowing and spots are, I'd really appreciate it ! I hate just dumping more Cal/mag blindly, but it sure seems to slow it down.

Week 5



Week 6





Another grow:

Week 4 flower



Week 6 flower




Week 7

My latest grow did a little better, but I think I still need improvement and am doing something wrong.

Week 9 flower (harvest)

Been happening to me as well last few grows
Try and save some fan leaves let them fall off the plant loves it
You want the buds getting light not the leaves as well

joesoap2013 said:

Been happening to me as well last few grows
Try and save some fan leaves let them fall off the plant loves it
You want the buds getting light not the leaves as well

Click to expand...

Yep, try to leave quite a few fan leaves for the plant to take nutrients from as needed. I've experimented with this quite a bit. I've also gone in the opposite direction lollipopping....

I'd still like to know what those leafs are trying to tell me though....Need more Mag? Calcium ? P and K too much or too little etc..? Is it normal senescence?

I get this like clockwork every grow right around week 5.... It progresses rapidly through the rest of flower--luckily I seem to keep it away from the buds (just barely) Each grow has been better and better, but I still see brown spots and then yellowing of leaves every time. I'm thinking my harvests are decent, but could be better without a deficiency.

Do you test your EC/PPM and PH of runoff? Maybe slight N excess with the slight claw especially in the first plant. I think the deficiency looks like K which is harder to take up with high N.

tehdansauce said:

Do you test your EC/PPM and PH of runoff? Maybe slight N excess with the slight claw especially in the first plant. I think the deficiency looks like K which is harder to take up with high N.

Click to expand...

Yes, I do use a PPM pen to read runoff and also check PH regularly (runoff and feed). Great information, yes its very possible that I'm feeding too much N into flower. I was not aware that N can cause K uptakes problems. I'm really hoping this is it because I'm already using Cal/Mag regularly, giving more seems like a bad idea.

Thanks much, you have no idea how much this helps, I really appreciate it.