What's wrong with this plant?

So...
Dutch passion white widow autos
10l airpots
Plant magic soil
Feeding 1ml/l Calmag, 3ml PM bloom
PH of soil is 6
Temps around 27°c with this bloody sunshine.
This one plant has been persistently showing signs of deficiency from the beginning. All the others are healthy. I've flushed it with loads of water a few times, fed it, dried it out, everything and it's still being a stupid little bitch. It's driving me fucking nuts. All the others are starting to flower, but I think this one isn't because of whatever it's suffering from.
I've always grown hydro, I decided to give soil a go, never again.

Any suggestions?

pH of 6 looks to be too low for soil. You can see the Calcium issues in your pic.

I went from hydro back to soil. Don't blame the dirt. I'd feed it compost tea on the next watering. Brewed with 7 ph water. Nothing but worm crap and black strap. Use that to flush the soil when it needs it.

badgerbadger said:

So...
Dutch passion white widow autos
10l airpots
Plant magic soil
Feeding 1ml/l Calmag, 3ml PM bloom
PH of soil is 6
Temps around 27°c with this bloody sunshine.
This one plant has been persistently showing signs of deficiency from the beginning. All the others are healthy. I've flushed it with loads of water a few times, fed it, dried it out, everything and it's still being a stupid little bitch. It's driving me fucking nuts. All the others are starting to flower, but I think this one isn't because of whatever it's suffering from.
I've always grown hydro, I decided to give soil a go, never again.

Any suggestions?

Click to expand...

ph is off

pots are entirely way to small

those plants should be in 10 gallon pots

OK, I'll flush it and give it some ph7 water and see how it goes.
Thanks guys

I just want to point out

it is also possible

1mls calmag and 3mls of whatever the other is

that don't sound like a lot of food

especially when dealing with an under sized pot

its very possible theyre hungry

the look like the could be iron def

what are the 3 npk number on the bottle of your bloom nute?

so don't be so quick to flush with plain water
tell me the npk numbers and do you water with nutes every watering or only every other?

how often are you watering?

Give her some epsom salts. Yellowing in the newer growth like that is most likely a sulfur deficiency. Resembles N deficiency but in newer growth more than the older stuff. Thick, woody stems are another sign of low S tho the leaf stems usually start going red with it. Low iron shows in new growth and starts with yellowing from the petiole, (where the leaf's fingers all meet), and works out to the tips where yours are yellowing from the edges of the fingers working into the centers like low S.

pH from 6 - 6.5 is the best for soil with 6.5 being the sweet spot but how you measure pH in soil and it's accuracy is often way off. Checking the pH of the first runoff is totally inaccurate. Industry standard testing is to water to saturation with pH balanced or neutral pH water like distilled or close to zero ppm RO water. Remove any runoff and allow the plant to sit for a few hours or overnight to allow the pH in the root zone to stabilize. Then add enough water to get some more runoff, preferably into a clean container, and then test that runoff. That will tell you the pH that your plant is sitting in much more accurately assuming your testing equipment is accurate so calibrate your pH pen just before testing the runoff or pray that your test strips are accurate. Dipping test strips into pH calibration sol'n should tell you that. A good pH pen is best tho.

If you are growing with tap water that has a high ppm it's almost impossible to keep the pH down as minerals in your water build up in the soil like scale in a kettle. Go RO or always be having pH hassles and don't test RO water and adjust pH before adding nutes as RO or distilled water has no real pH of it's own and takes on the pH of whatever is added to it. I use pH Perfect nutes with RO water and never check the pH whether growing in soil or DWC.

This chart shows S and a couple other things the previous chart doesn't.



Good luck!