Yellowing brown spotted leaves is spreading.

[Mycriot]

I’m in week 6 of flower and the yellowing leaves with brown spots are getting worse. I’m in 7 gallon pots with vermifire soil. I feed jacks nutrients part a and b once to twice a week with power.si. About one gallon of water every watering every other day. Ph is 6.3-6.7 and ec for feeding is around 1.7-2.0. Run off comes out fine. This started around week 4 is just getting worse. I don’t know if I’m overwatering or underwatering or if my drippers aren’t placed right. I have have four drippers in each pot spaced equally apart. These are light dep plants so temp control is hard but is never below 60 and never above 80 degrees Fahrenheit. Please any suggestions will be much appreciated.

 

[mysticepipedon]

I'm thinking they're a little low on nitrogen. Don't overreact to this, as you do not want to over fertilize with N. I've had plants that relentlessly dropped leaves like this in flower, apparently from N deficiency, but adding nutrients didn't stop it.

You can remove those yellow leaves, BTW. They will not green up again, no matter what.

 

[iX_Lazy_Xi]

Strain?

 

[ComfortablyNumb]

You have them in this wonderful living soil and you are still feeding it?
Why? It's overloaded. No food for a week, just water and watch.
Remove the yellowed leaves, all they are at this point is a distraction.

 

[Imzzaudae]

That potting mix is a long way from wonderful living soil. It's just over priced peat based potting mix.
Nothing wonderful or living about it. After giving the picture a look over, I see brown tips, and blotches on some dying leaves.
These are signs of Phosphorus deficiency on older growth.
The plant looks hungry but it's also late in the year. It looks like it's simply stripping nitrogen from old growth.
Next time, mix in a couple of cups of Gypsum pr bag of potting mix before potting the plants and Calcium will not be a issue. You might consider giving it a little blooming fertilizer. It's budding nicely and the year is wearing on, I don't think I'd push it buy adding a lot nitrogen. The Plant is no longer growing and does not need a lot of Nitrogen. It will get all it needs from a blooming mix like Pro Mix 3-6-12 and naturally stripping old growth. Pick up leaves as they drop and let it finish up. I'm thinking you fertilized the plant and the phosphorus issue went away a while back.

 

[lvstealth]

not such a long way from wonderful, and yup... its living.

what strain are you running? some do this more, some not at all.

they used up something you are not giving them (something that was in the soil, but you didnt feed your soil, so it is no longer available).

i wont pretend to know what that is, so many things make the leaves yellow.

how the leaves turn, and where on the plant help diagnose what is going on, but i dont see the normal patterns here.

just what id do...

top dress with something like

Amazon.com

or any supersoil or "hot" soil. or try any of the natural ones like bat guano, worm castings, or the like.

the plant knows what it needs and it is taking it from the leaves because it cant find it in the soil or what you feed them.

unless you are sure which, you are just shooting in the dark. the good thing with dirt is you can back up and give the dirt some lovin and fix things without hurting other things.

you think its cal, give cal and then it locks out potassium, mag and iron. you think its N, and then the leaves start browning instead of yellowing. you could try up and down on any of the things your plant needs and not hit on the right thing...

or... fix your soil. your plant will take what it needs.

 

[MIGrampaUSA]

not such a long way from wonderful, and yup... its living.

what strain are you running? some do this more, some not at all.

they used up something you are not giving them (something that was in the soil, but you didnt feed your soil, so it is no longer available).

i wont pretend to know what that is, so many things make the leaves yellow.

how the leaves turn, and where on the plant help diagnose what is going on, but i dont see the normal patterns here.

just what id do...

top dress with something like

Amazon.com

or any supersoil or "hot" soil. or try any of the natural ones like bat guano, worm castings, or the like.

the plant knows what it needs and it is taking it from the leaves because it cant find it in the soil or what you feed them.

unless you are sure which, you are just shooting in the dark. the good thing with dirt is you can back up and give the dirt some lovin and fix things without hurting other things.

you think its cal, give cal and then it locks out potassium, mag and iron. you think its N, and then the leaves start browning instead of yellowing. you could try up and down on any of the things your plant needs and not hit on the right thing...

or... fix your soil. your plant will take what it needs.

I also wonder if some of this is caused by watering issues. 7 gallon pots, about 1 gallon of water every other day? With the frequency of your feeding with Jack's, it appears to be more of an uptake issue than anything else.

If this were my grow I would do the following:

1) Verify plants need water using @ComfortablyNumb's "New Simplified Way to Water" tutorial. https://www.thcfarmer.com/threads/new-simplified-way-to-water.131476/. It's simply ingenious, and the meter is very inexpensive.
2) Trim all dead/dying leaves and anything that has not already been removed starting a few inches under the net all the way down to the soil.
3) Increase air flow under the net.

 

[Squatch61]

Are you using a drip system with your pots because it looks like it in the photo's? If you are get rid of it because it will not work with smart pots I had the same issue. The problem with the drip system is that it only waters the top of the plant leaving the bottom of the plant dry. Do you pick up your plants to tell how dry they are? If you don't start. If the bags are dry they will be extremely light I started the deluge and get thirsty method and within a week turned my ladies around. I soak my girls in a large bucket for 5 minutes (deluge) weigh them by hand to tell if they are soaked and then let them sit for seven days no water (thirsty) and they are doing great now no more yellowing leaves. Also check your soil PH will a good meter and don't go cheap I did that too. I'm still fighting the soil PH issue but at least my plants are getting the water they need to grow and have stopped cannibalizing themselves in order to feed the top growth. Hope this helps you

 

[Imzzaudae]

After re reading this post. I have to admit that I told you to use 3-6-12 rather than 5-15-5. Not that it's going to make a great big difference.
It's normal for plants to start using up the nitrogen in leaves as they get into flower. Bumping up the Phosphorus and cutting back on the nitrogen and potassium worn hurt the plant it will help with bud formation. Any way, I'm thinking they where way to dry and hope in the end you ended up with some good bud.
I'm sure the plant if not already harvested will be looking pretty nice about now and ready to cut.