Yellowing in Pro-Mix

[T-type]

These were at first grown in dixie cups using miracle grow nutrients and un phed water. I have since switched to Floranova. I guess its all in the question form so here it is.

I guess my concern is I am not feeding them enough for them to be so yellow at this stage in the game, 26 days of flower. At the same time I'm afraid I'm reading it wrong and upping dosage would be devastating. Some guidance would be nice.

How long has this problem been going on?
A while now

What STRAIN are you growing?
SDv3 Crosses

What was the establishing technique? (seed or clone?)
seed

What is the age of your plants?
Don't know, Day 26 flowering

How long have they been in the soil mixture they are in now?
Don't know, Few weeks longer than they have been flowering.

How Tall are the plants?

What PHASE (seedling, vegetative or flower) are the plants in?
Flowering

What Technique are you using? (SOG, SCROG etc)
Some were lst most just multiple toppings

What size pots are you using? (Include how many subjects to pot)
3 gallon but due to compaction maybe 2-2.5

What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)
Promix added perlite

What Nutrient's are you using?
Currently using Floranova Bloom, had used miracle grow(un phed) then used floranova grow now bloom. Also been using koolbloom liquid at 1 ml a gallon

How much of each nutrient are you using with how much water? *Knowing the brand is very helpful*
I have usually been feeding them 1.3 ec after watering with heavy runoff

How often are you feeding?
Every time I water

If flowering, when did you switch over to using Bloom nutrients?
immediately

What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)
Veg nutes, koolbloom

What is the TDS/EC/PPM of your nutrients used?
EC 1.3, but last watering today i fed 1.5 ec. This is before koolbloom

What is the pH of the "RUN-OFF"?
Haven't tested, but I have been flushing a lot due to using miracle grow and no ph meter in the beginning

What method of pH test was administered? Using Strips? pH pen?
PH Pen

How often are you watering?
~3 days

When was your last feeding and how often are you feeding?
Feeding every watering, but after heavy runoff

What size bulb are you using?
2 600 watts

What is the distance to the canopy?
Approx 8 inches

What is your RH Factor? (Relative Humidity)
Not too sure i trust my humidity gauge, but 55-60%

What is the canopy temperature?
72-78 degrees

What is the Day/Night Temp? (Include fluctuation range)
Day Temp 72-78 Night 60-68

What is the current Air Flow? (cfm etc.)
I have a 6 inch vortex sucking air through the hoods and out

Tell us about your ventilation, intake exhaust and when its running and not running ?
No intakes, just cracks around doors and whatnot. Oscillating fan. Both running 24/7

Is the fan blowing directly at plants?
Yeah pretty much, but its a few feet away and oscillates

Is the grow substrate constantly wet or moist?
No I let it dry thouroghly before watering

Is your water HARD or SOFT?
Don't know. Ec is .28 out of the tap ph 8+

What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
Using tap. I have a ro machine though if need be

Are you using water from a water softener?
no

Has plant been recently pruned, cloned or pinched?
I pruned off lower growth around week 1 of flower, since only dead leaves have come off.

Have any pest chemicals been used? If so what and when?
no

Are plant's infected with pest's?
no

Thanks for any help in advance.

BTW: These are not the same plants in the pics, I believe that it is 2 different ones.

 

[PuReKnOwLeDgE]

Test the ppm and PH of your runoff, you will find your problem there. You are most likely overfeeding imo and causing lockout. Testing your runoff will tell you what is going on, I was lazy and did't check mine the whole grow and today when I did to my suprise it had higher ppm then I expected.

 

[T-type]

Ok I just watered and fed them so I will run a little ro water through and collect it? Is that the procedure for testing runoff ph?

 

[T-type]

I went to test and I just dumped like a quart or two of water into the container and collected the first little bit of runoff that came out.

PH 5.8
EC .96

Seems reasonable no?

 

[SumDumGuy]

I went to test and I just dumped like a quart or two of water into the container and collected the first little bit of runoff that came out.

PH 5.8
EC .96

Seems reasonable no?

Loks like PuReKnOwLeDgE nailed it. You're pH is low. Need to bring it up by a point.

 

[T-type]

Ok I will try to adjust next feeding.

I thought 5.8 - 6.3 was acceptable though?

 

[ISP_SmokeTrain]

a pH of 5.8 to 6.3 is acceptable. You're putting in a little too much P & K, and not enough N. Balance out your mix, by reducing the P & K, and adding in a bit more N. Keep the EC 1.2 or under until things green back up. Then you can slowly bump up the P & K, and when you have only a couple of weeks left, reduce the N first, then the P & K, to fade to the finish line.
Also consider, moving your lights up 4 inches. The radiant heat, hitting the top of your plants, will cause them to draw up nutes quickier, but use them less efficently. It's all about balance.

 

[T-type]

Well I only have floranova bloom, grow, and koolbloom.

So you recomend that I ditch the koolbloom?
Add a little floranova grow to the mix?

 

[SumDumGuy]

Ok I will try to adjust next feeding.

I thought 5.8 - 6.3 was acceptable though?

Hi T-type,
Well the pH range you're in is geared more hydroponic growing. If you're using ProMIX which you stated in the questionnaire or any type of soil medium than your range should be 6.5 to 6.8. I used ProMIX for some time before moving to hydro and I tried my best to maintain it at that with no issues.

Now my hydro grows will function well with a pH of 5.5 - 6.2.

 

[T-type]

I did move the lights up a little as it seemed that the tallest tops were affected first, btw.

 

[T-type]

Hi T-type,
Well the pH range you're in is geared more hydroponic growing. If you're using ProMIX which you stated in the questionnaire or any type of soil medium than your range should be 6.4 to 6.8. I used ProMIX for some time before moving to hydro and I tried my best to maintain it at that with no issues.

I know that is the ph range for soil, but for some reason I was under the impression that if you were using straight promix and no additives to the mix that you should be running more of a hydro ph range.

I'm Wrong?

 

[ISP_SmokeTrain]

Well I only have floranova bloom, grow, and koolbloom.

So you recomend that I ditch the koolbloom?
Add a little floranova grow to the mix?

Yes, for the time being put the Koolboom back on the shelf, and add in the Floranova Grow.
Promix is a soilless medium and should be treated, as a compromise between soil & hydro. Thus the pH of 5.8 to 6.3 is fine.

 

[PuReKnOwLeDgE]

floranova bloom and at that stage in flower, I would be looking for 1.6-2.0 EC depending on how the plants react. In pro mix 5.8 is perfect but many stay close to 6 to stay on the safe side.

No lockout there, just underfeeding.

I have used FNB for a couple years now, knock them up to 1.8

 

[The WeedChucks]

Is pro mix good to use? is it fertilize?

 

[couchlockd]

the run off is fine at .98 ec but you should be trying to keep the root zone ec at around 1.2 to 1.6 ms/cm. ph is a little on the low side for pro mix, i like my runoff to test at like 6.2 to 6.7 and all is well i let the runoff get to like .68 ms/cm before feeding again. Feeding every time with FNB can tend to accumulate a lot of micronutes in the soil and reak havock with the ph and locking stuff out.

i use pro mixx hp with 1 part perlite(big and chuncky) to 3 parts perlite and that is considered a pretty light mix and i still do a plain ol ro feeding in between or 2 plains sometimes, but also using conny with kushie kush and overdrive and etc...

what type of pro mix are you using bx, hp, or whatelese? also do you use myco fungi and such biologicals?

 

[B. Friendly]

http://www.icmag.com/ic/showthread.php?t=11688 just for reference
you have some deficiencies, fastest way to correct is to do a 25% strenght feed solution as a foliar feed this works 7x faster than correction through roots. Do this then again a couple days later.
I personally don't think floranova on it's own is enough, you need to buy a CalMg solution any one in your hydro store will be ok.
Or get dutchmaster's bloom and use as a foliar feed. But use what you have now at 25%.

 

[T-type]

I'm using the orange bag of promix for containers, nothing except miracle gro perlite added.


Do I really want to foliar feed at this point in flowering(Almost half done)?

 

[frikn squirrel]

I know that is the ph range for soil, but for some reason I was under the impression that if you were using straight promix and no additives to the mix that you should be running more of a hydro ph range.

I'm Wrong?

Can somebody who knows please address this question? Some people say to use soil ph levels, others say hydro levels. What's the definitive answer?

 

[couchlockd]

I'm using the orange bag of promix for containers, nothing except miracle gro perlite added


thats probably the root of your problem.....miracle grow perlite has time release fertilizer that lasts for "up to three months"

MG is okay for some things but the ferts in thier perlite is really really hot and floranova, according to the directions runs pretty hott too.

but i would flush. when in doubt, flush it out!

then wait a couple days (2-3) and give em a nice feed with a little bloom booster but try to acheive a ec of 1.3-1.4 of the final solution and stick the ph at dead on 6

 

[spadedNfaded]

*Double post. please delete