Ok, this has me stumped

[Buster]

Having a problem with blotchy yellowing of the leaves. My plants are otherwise healthy and growing well, but beginning three weeks ago the lowermost leaves have started turning a blotchy yellow colour, with the very bottom leaves now brown and dead.

 

This problem is clearly working it's way up the plant. I have alreadyconsidered Magnesium deficiency as a cause and have been treating them with magnesium sulphate, but this has had no effect on the problem and I no longer consider this the cause.

 

The plants are growing in pH 6.5 soil/vermiculite/perlite mix, and are watered with pH corrected water every 2-3 days backed up by moisture-meter readings. I fertilise with Fish and Kelp 4:1:1 fortnightly.

 

Sorry for the long post, but this problem has got me scratching my head

 

Buster.

[Ferre]

Healthy looking lady mate, don't mess her up with well meant corrections on the nute dept. It's kinda normal for mj to loose them first leaves, it's still kind of a baby, don't worry you're doing great.

[Buster]

Thanks tboat.

 

I was worried about the yellowing as it seems to be working its way up at the same rate as the new growth was growing. She is still quite young.

 

Buster.

[sols]

g'day; plant looks great to me, maybe add little extra nutes, not too much tho. dead leaf is normal.

[xserrurier]

This is a very common problem with us: Magnesium deficiency. Add some epsom salts next time you fertilize... 3 tablespoons in a five gallon bucket to start off (kick it in the butt), then 2 teaspoons in a five gallon bucket for maintenance (every 2nd fert or so).

[budgirl]

hey there it sounds like ur fert mix is wrong too much nitrogen not enough potassium and not enough phoserus ...but i could be wrong but just check