Young plant, Lime green and yellowing from the bottom up (pic).

Its about 3 weeks old. It been very light green since it sprouted. The oldest leaves started to turn yellow, and eventually brown. They are not very crispy, and don't crumble much when you touch them. Stems are slightly purple. I am watering with 7.4+ and the runoff is slightly below 6. It was recently transplanted into different soil. Does this look like low PH? I doubt it's over watering because it happened while I was on vacation and the soil was bone dry.

roots cant take nutrients from dry soil. But don't start over watering because you didnt water enough.

I should have said it started while I was on vacation. I got home and it was very light green all over, and had the slightest bit of yellowing on the lowest leaves. It has continued even after it was watered. My super cheap soil PH meter says its around 5, but I think that is kinda low. Would a PH between 5-6 cause symptoms like this?

Im mor concerned about your soil pH you say you water with 7.4 but your runoff is below 6. That leads me to believe that your soil is too acidic and could be causing lockout issues. What brand of soil are you using? was it balanced with Lime? optimum soil pH is 6.5-6.8.

I started with MG organic. I switched to regular MG without the nute balls. I have seen others have success with MG but I think it's time I ditch it.

"""pH Fluctuation

Both of these leaves in figure 3 and figure 4 are from the same plant. It could be over fertilization, but more likely it is due to the pH being off. Too high or too low a pH can lock up nutrients in the form of undisolvable salts and compounds, some of which are actually toxic to the plants. What then happens is the grower then tries to supplement the plants diet by adding more fertilizers, throwing off the pH even more and locking up even more nutrients. This type of problem is seen more often in soil mixes, where inconsistent mixing of the medium's components leads to "hot" spots. """

This comes from another thread that is stickied in this forum. i think also maybe a phosphorus deficiency maybe as well?

Mattpd said:

I started with MG organic. I switched to regular MG without the nute balls. I have seen others have success with MG but I think it's time I ditch it.

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yeah man nothing good for MJ in MG.

when buying a bag of soil look for the words ''pH balanced to 6.5 with lime.''

Gonna have to drive to the hydro store for anything PH balanced. Everything around here is either Scott's or MG, but one good note. The second batch of MG is working out much better than the first. It seems there is something in the Organic variety that makes it very hard to keep the PH up.

I agree with those guys that it's PH lockout. Everything indicates that you have soil PH in the 5.0 range, maybe lower, and the plant is starting to starve and eat it's leaves. Transplanting would be best, but you could also flush with some limewater, or with some pelletized lime on top of the soil, washing it down through as you flush. Another good idea would be to foliar feed until you get this fixed, as it'll help your plant from getting worse, and also help it recover faster.

Yup, just raise your PH, mate. Should kick right back. Most people reccomend something between 6.5 and 7, but usually lean towards the lower. More nitrogen that way.

Baby it with filtered PH neutral water while you nurse it back to health.

Maybe invest in some superthrive if you want to give it a really good chance at bouncing back.