Bottom leaves of one plant yellowing - organic grow

[spikerbiker]

Hello everyone. I am a new grower and I have 2 Blue mystics at 33 days and 1 short rider at 25 days. Here is the setup:

Soil: roots organic soil with dolomite lime added pre planting
Nutes: roots organic buddha grow, roots organic extreme serene and blackstrap molasses
Feeding: 3/4 tsp buddha grow, 3/4 tsp extreme serene, 1tsp molasses per gallon.
soil PH - yesterday was 7.5
lights: 250W of cfl 6400K

Last week I fed them twice in one week not thinking... I had been watering once a week but they dried out in 3 days, so I just fed them again. I also added more dirt at the top and covered with perlite to make sure i didn't get any fungus gnats with the new soil i added.

Today i noticed a lot of yellowing in a few lower leaves on one plant. I watered tonight with plain water only. Two plants still look great. All have the same feeding soil etc. Here are some pictures of the affected leaves.

I sincerely appreciate any help with diagnosis of the issue.

 

[Chester]

What are the NPK of the Buddha Grow and Extreme Serene ? I think she's hungry ... Potential need for a pinch of Epsom salts for magnesium or cal mag ... My feed chart shows up to 3 tsp of Grow at this point in Veg along w/ a tsp of Extreme Serene ... once a leaf yellows it won't turn green again ... it's good to catch a deficiency early and I think you have ... I'd like to hear some opinions from others ...

 

[spikerbiker]

Thanks Chester, that could be...I've been feeding about 1/3 of recommended dosage of all nutes.
Buddha Grow 2-0.25-1.5
Extreme serene 0-2-2

I'm also unsure about ph with an organic grow. The only test I have is the water tester. I have a cheap soil meter, but have heard not to trust it.

If I just watered last night with clear water, when is the next time I could feed them? If I feed them now, won't i be over watering? thanks for the input.

 

[Chester]

Depends on how much you watered them last time ... That's one reason why I like loose airy soil that drains well (you should be fine) ... I'd mix up enough feed to give them 1/2 the usual water at nearly full strength ... if 1/2 the normal water seems like too much then scale back a little ... kind of have to play it by ear ... Hopefully it's not a ph problem ...

 

[mjdregba]

My personal opinion is that it is PH; I use a mix of my own organic soil suplemented with a couple of biobizz products. In the past I have had real problems when my soil PH wasnt within the 6-7 range. You said your soil was 7.5, which is just outside of the range that nitrogen is absorbed - yellowing could be nitrogen deficiency thru PH imbalance.

The only chemical I use on my grow is PH up and down; If this was me, on my next feed I would probably ensure the water is PH'd down to around 5.5, this should bring your soil down to around 6.5 (6.3 is the ideal but you never achieve it); then over time just keep measuring the soil and adjusting the PH to meet in the middle.

I also find epsom salts once every couple of weeks helps as a general tonic - I also do the molasses only once every couple of weeks too.

good luck m8, keep us updated.

 

[spikerbiker]

My ph tester is fubar. It it's measuring everything at 7.5. I have drop test solution but all I know is my water is 7.0. Couldn't test feed or runoff it was too dark. I've ordered a new pen will be here on Monday. I have a huge feeding yesterday without molasses. Only one plant shoes any yellowing still. All on lower leaves. So on Monday I will do a real ph test with a calibrated meter.

 

[Trapper]

I'm really happy with my Oakton Ecotestr Ph2...and it wasn't expensive at all (comparatively)...holds calibration well.

 

[spikerbiker]

I picked that one Trap...I'd say great minds think alike but hate to insult you! Lol.

 

[Trapper]

I picked that one Trap...I'd say great minds think alike but hate to insult you! Lol.

LOL! No one every hurled the accusation of intelligence this way....

Stickman recommended it to me...

 

[mjdregba]

My ph tester is fubar. It it's measuring everything at 7.5. I have drop test solution but all I know is my water is 7.0. Couldn't test feed or runoff it was too dark. I've ordered a new pen will be here on Monday. I have a huge feeding yesterday without molasses. Only one plant shoes any yellowing still. All on lower leaves. So on Monday I will do a real ph test with a calibrated meter.

I use this pen http://www.ebay.co.uk/itm/Electric-...Bottle_Warmers_Coolers_LE&hash=item3cdede3cfd - works really well hardly ever goes out of calibration.

Also to check my soil I use http://www.ebay.co.uk/itm/3-in1-Pla...?pt=UK_Sound_Vision_Other&hash=item20bcc46647 it wont give you a wholly accurate reading, but it does give you a general idea of what is going on inside the soil. Just scrub it with a scourer before each use or it wont work.