Organic Grow Slight Yellowing in lower leaves, think its just a transition.

I have about 15 plants growing outdoors right now, all organic using a SuperSoil blend. Recently on a few of the plants, a few of the lower leaves have seemed to randomly yellow/brown and die. They dont quite look to be flowering yet, but are stretching out a bit. This is the first time any of the leaves have yellowed, and the growth does not seem to be slowing. They are only in 5 gallon pots and have been growing from clone since the last week of May. I've never NOT fed my plants, so Im wondering if this is just a normal way that a plant moves fast moving nutes like nitrogen in an organic environment during that explosive early flowering stage when not given extra supplements. Any thoughts other than my myco game is prob weak lol?

sorry guys meant to put this in the deficiencies forum.

How long did the soil cook?

I'd only be concerned if it looks like it is spreading/moving up the plant. How long have they been in their current containers and how big are they (the plants)? Also, how is your watering is it sufficient? If the pots get too dry the plants may show what appears to be a nutrient deficiency. If you don't have a mulch layer it wouldn't hurt to cover the soil with some chopped alfalfa (not alfalfa meal) or even moss.

Straw or Hay,, wood chips or bark ....

Thanks guys, actually, either or both of those could be the cause, but I am really starting to think it was the lack of water. I was only able to cook my soil for about 40 days, but I put a greater percentage of supersoil to compensate as well as regular addition of compost tea.

Interesting that you mention water though Nullis, I was out on vacation and so a friend had to water them, but 5 days apart as opposed to my normal of about 3. They are rooftop, so my avg temps are in the high 70s low 80s through parts of the day too. Luckily I have a redwood tree in my yard so I can just use some bark and leaf mulch. Thanks again +1s

Many underestimate the importance of water... of course it doesn't help that so many (particularly less experienced) growers are afraid of over-watering. Roots take up nutrients along with water, so if soil moisture is low nutrient uptake will also be stunted even if it isn't dry enough for the leaves to go flaccid.

It's even more important to keep some level of moisture in soil when using mycorrhizal fungi\beneficials because they'll tend to die out or become inactive if it is too dry. This is one reason having a mulch layer is a good idea.