Googled Endlessly and I'm still near where to fixing my problem, Please help

Hi All,

Throughout the whole grow of this Autoflower, It's been getting ph'd water from 6.2 - 6.5 and last week the runoff PH went from 6.6 to 7.0-7.2 and it won't budge.

Things I've tried
- Flushing it out with gallons of water
- Upping the nutrients
- Googled 100 different things

It's in Biobizz Light Mix Soil and I'm using the TSW2000, 15 inches from the canopy on 75% strength they're getting about 600 PAR

It's fair to say nothing has helped get a fix on this, the PH won't move below 7ph and it's mentally killing me.

Here's some pictures of what's happening, It's affect the top/middle/lower leaves about 3 leaves on each section and they start on the veins.

Please help me with this, I'd love to know from someone who's fixed this before or knows how too.

What if any nutes are you using? Calmag? I wouldn’t bother chasing ph in soil runoff, it’ll drive you crazy and accomplish nothing. Put the correct ph of water in, the soil is buffered, the ph will rise.

Phytoplankton said:

What if any nutes are you using? Calmag? I wouldn’t bother chasing ph in soil runoff, it’ll drive you crazy and accomplish nothing. Put the correct ph of water in, the soil is buffered, the ph will rise.

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I feed it with calmag, grow and bloom from the biobizz line, I still have to find out what's causing the rusting, any ideas what the problem is?

eiregreen1 said:

I feed it with calmag, grow and bloom from the biobizz line, I still have to find out what's causing the rusting, any ideas what the problem is?

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Is that biobizz calmag? How much per a L?

Also are you just using bloom now or mixing the two?

Nutty sKunK said:

Is that biobizz calmag? How much per a L?

Also are you just using bloom now or mixing the two?

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I'm follow the biobizz chart but using 3/4th of the recommended, I stopped using calmag on week 4-5 cause i got some bad advice, i reintroduced it, I use 1.2ml per Litre just because of the deficiency at the moment. I initially thought it was my PH locking it out but im very unsure.

so it's 3ml grow and 2ml bloom with 1.2ml calmag

the plant is 51 days old, and im worried.

eiregreen1 said:

I'm follow the biobizz chart but using 3/4th of the recommended, I stopped using calmag on week 4-5 cause i got some bad advice, i reintroduced it, I use 1.2ml per Litre just because of the deficiency at the moment. I initially thought it was my PH locking it out but im very unsure.

so it's 3ml grow and 2ml bloom with 1.2ml calmag

the plant is 51 days old, and im worried.

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That random yellowing can be result of moisture stress. Did it startt after stretch or were u having problems in veg?

What size pot, how much water/ how often?

You’re feeding it right so something else

Nutty sKunK said:

That random yellowing can be result of moisture stress. Did it startt after stretch or were u having problems in veg?

What size pot, how much water/ how often?

You’re feeding it right so something else

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started just after stretch, had a little hard time with humidity, was on 60% for a week, now its stable on 50-55%, I know my TSW2000 is abit strong, I have it about 16 inches above on the canopy on 75% giving it 550 par

It's in a 5 Gallon Airpot, Plant was super healthy and no problems up until week 5 when flowering started, then i noticed the veins getting rusty and i didn't change how i watered it, it was ph'd as normal.

and yeah i feed it twice a day cause its 28c in there and it dries out fast I run them on a 18/6 light schedule too

eiregreen1 said:

started just after stretch, had a little hard time with humidity, was on 60% for a week, now its stable on 50-55%, I know my TSW2000 is abit strong, I have it about 16 inches above on the canopy on 75% giving it 550 par

It's in a 5 Gallon Airpot, Plant was super healthy and no problems up until week 5 when flowering started, then i noticed the veins getting rusty and i didn't change how i watered it, it was ph'd as normal.

and yeah i feed it twice a day cause its 28c in there and it dries out fast I run them on a 18/6 light schedule too

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Were you giving calmag before the deficiency? During the whole of veg?

During stretch and initial budding is the time for the highest demand of calcium and phosphorus.

If you weren’t giving them calmag it sounds like they depleted the Ca reserves before you added more.

Also how much water into the 5 gallon pot?

Nutty sKunK said:

Were you giving calmag before the deficiency? During the whole of veg?

During stretch and initial budding is the time for the highest demand of calcium and phosphorus.

If you weren’t giving them calmag it sounds like they depleted the Ca reserves before you added more.

Also how much water into the 5 gallon pot?

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It was happening when getting calmag, i stopped because someone told me too and that it was signs of calmag overdosing, I was feeding it 1ml per litre

I water it with 1 litre but twice a day before lights go off here's a picture of the whole plant, it might help?

the past 4 days is when i reintroduced the calmag and every feeding it's been getting 1.2mls

they both have the rusting but the one on the right is more of a lime green but not terribly bad, it's been getting alot of nitrogen lately.

eiregreen1 said:

It was happening when getting calmag, i stopped because someone told me too and that it was signs of calmag overdosing, I was feeding it 1ml per litre

I water it with 1 litre but twice a day before lights go off here's a picture of the whole plant, it might help?

the past 4 days is when i reintroduced the calmag and every feeding it's been getting 1.2mls

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Are you getting run off with just 1l of feed? I found 3L in a 5 gallon pot would only give a little
Trickle out the bottom.

Not all calmags are the same. Biobizz version has no N or iron or trace elements, just cal and mag.

If you keep it at 1.2ml and it shows no sign of getting better, it might be due to lack of run off, salt buildup.

Calcium is slow to fix if it’s deficient, usually 3-5 days before the rusting slows and stops

Nutty sKunK said:

Are you getting run off with just 1l of feed? I found 3L in a 5 gallon pot would only give a little
Trickle out the bottom.

Not all calmags are the same. Biobizz version has no N or iron or trace elements, just cal and mag.

If you keep it at 1.2ml and it shows no sign of getting better, it might be due to lack of run off, salt buildup.

Calcium is slow to fix if it’s deficient, usually 3-5 days before the rusting slows and stops

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I don't get runoff with 1L but i do with 2L, i did 2L all at once before, i got around 15% runoff consistently

I also never wash out salts, I feed endlessly, would you suggest i water it inbetween feedings in a few days?

eiregreen1 said:

I don't get runoff with 1L but i do with 2L, i did 2L all at once before, i got around 15% runoff consistently

I also never wash out salts, I feed endlessly, would you suggest i water it inbetween feedings in a few days?

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See don’t be fooled with run off. If the soil gets too dry or loosely filled in the pot water will shoot down the edges (wee channels in the soil) and fire out the bottom before the rest of the media is saturated. Not saying that’s what’s happened but I don’t get any run off giving 2l unless it’s super dry or I pour too fast

A good regime is feed feed, water (calmag only) for peat based soil. Especially in flower. With veg you can get away with feeding every time.

Flowering is different as you need to watch your P and K levels don’t get too high.

Also at the end of the day we don’t need perfect plants to produce awesome buds! A little deficiency ain’t gonna slow it down much at all!

pH is maybe a bit low for soil, check a pH chart

yosim said:

pH is maybe a bit low for soil, check a pH chart

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He said his soil was ph 7?

Nutty sKunK said:

He said his soil was ph 7?

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That's soil run off or something, not sure you can trust that.

It's been getting ph'd water from 6.2 - 6.5

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yosim said:

That's soil run off or something, not sure you can trust that.

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It’s not absolute accurate measurement of the soil but it does give one an idea. Few factors to bear in mind. The EC will be concentrated and usually the pH is lower than the media itself.

So if his run off is 7 with an input of 6 his soil isn’t going to be below 5, ph5 and below is where issue arise in peat based soil. Which he’s using

eiregreen1 said:

I water it with 1 litre but twice a day before lights go off here's a picture of the whole plant, it might help?

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you are watering twice a day in soil? You should be watering/feeding 2-3 times a week (per the biobizz feeding chart) and watering enough so the medium does not dry out completely in between feeding. You do not need to water to run off with biobizz, you would just be wasting your nutes..

are you following the feeding chart for light mix? are you using tap water or ro? Calmag is only suggested to use in every watering if you use ro/have very soft water. otherwise they suggest one a week if you notice a need

calmag rates are listed as .3ml/l wk1-6, .5ml/l wk6-8, .8ml/l wk8-10 for prevention (they say up to .8ml/l wk1-8 or up to 1.2ml/l wk8-10 for deficiency correction).

I would feed at 75% listed rate and make sure to fully saturate your medium, then see when it needs another watering. I would also raise your light to 18-20" above the canopy.

Also it is best to try to lower your ph between 6.2-6.5 before watering. 7 is a little high and although the soil microbes should bring you down where it should be, biobizz does still suggest lowering to 6.2-6.5

If your ph is below that range you have to raise it as soil microbes are not as efficient at raising ph and you can see issues due to too low ph going in

Edit* this was a response to someone who deleted their post, leaving it up anyway.

They're growing with biobizz in biobizz soil both of which are organic so how can they have salt buildup?

EC meters are not compatible with organic nutes.. readings will not be useful.

Do not water to run off and allow your plant to sit in the water, that is a roadmap for ph issues.

Do saturate your medium when you water/feed by watering slowly to ensure the medium is saturated well.

ALPHA.GanjaGuy said:

Edit* this was a response to someone who deleted their post, leaving it up anyway.

They're growing with biobizz in biobizz soil both of which are organic so how can they have salt buildup?

EC meters are not compatible with organic nutes.. readings will not be useful.

Do not water to run off and allow your plant to sit in the water, that is a roadmap for ph issues.

Do saturate your medium when you water/feed by watering slowly to ensure the medium is saturated well.

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Exactly things like feeding the microbial herd vs direct nutrient salts in hydro. Then again I only grow hydro so my understanding of soil is purely theoretical.