Yellowing at 4th Week of Flower

Medium - Soil
Brand and type of soil - Nutrifield Coco
Indoors
Strain - Paris OG
Age - 4th week into flower
Double Ended HPS 1000w
Distance from canopy - 36 inches
Water every few days, RO system
Mix of Sensi Bloom A/B Coco, Ful Power Humic Acid, Hygrozyme, Beneficial Bacteria, & Protekt. 1.25 gallons per 5 gallon pot
Runoff pH 6.0 and PPM 700
77 degrees F and 40-45 RH
5 Gallon Smart Pots
No bugs

Any ideas what could be going on? Will I be able to recover from this or am I pretty much screwed? Any help is appreciated.

HansMoleman10 said:

Medium - Soil
Brand and type of soil - Nutrifield Coco
Indoors
Strain - Paris OG
Age - 4th week into flower
Double Ended HPS 1000w
Distance from canopy - 36 inches
Water every few days, RO system
Mix of Sensi Bloom A/B Coco, Ful Power Humic Acid, Hygrozyme, Beneficial Bacteria, & Protekt. 1.25 gallons per 5 gallon pot
Runoff pH 6.0 and PPM 700
77 degrees F and 40-45 RH
5 Gallon Smart Pots
No bugs

Any ideas what could be going on? Will I be able to recover from this or am I pretty much screwed? Any help is appreciated.

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Pretty common problem with a pretty easy fix...you started bloom nutes too early. A plant still needs veg nutes for first few weeks of flower. Your plant just needs a small boost of N. Before I went organic my nute schedule for flower was veg nutes first 2 weeks of flower, half veg half bloom for weeks 3-4 then just bloom from there.

Add some N, they will be fine.

Don't expect them to go back to "normal" green. You can prevent it from getting worse by giving it N. But in my experience in flower they won't go back. They're focused on flowers now.

Good advice about grow nutes early in flower also. Live and learn.

Thank you all for your timely responses! You guys have been a huge help.

One more question for you all. To add some N, I have 3 different products that contain it, but would like to know which one I should add one or if I should use more than one in combination with each other.

Neptune' Harvest Fish Fertilizer - 2-4-1
Bushdoctor Wholly Mackerel - 3-1-0
Kelp Green - 1.27-0.25-0.32

The kelp. That's what I would go with initially. Maybe 1/2 strength

I don't use those nutes and would never say how much. But the advise ABOVE ---> is the highest ratio of N on your list. Each brand is different "strength". I NEVER go above 500 ppm. I see other brands people are using above 1500 ppm in soil. So it all depends on brands.

goldberg71b said:

I don't use those nutes and would never say how much. But the advise ABOVE ---> is the highest ratio of N on your list. Each brand is different "strength". I NEVER go above 500 ppm. I see other brands people are using above 1500 ppm in soil. So it all depends on brands.

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When you say you never go above 500 ppm, is that soil ppm or is that the nutrients ppm before feeding?

Nutrient ppm. As far as I know there is no such thing as soil ppm. If you're asking if I'm growing in soil. Kind of. I'm in pro mix/perlite. 50/50.

goldberg71b said:

Don't expect them to go back to "normal" green. You can prevent it from getting worse by giving it N. But in my experience in flower they won't go back. They're focused on flowers now.

Good advice about grow nutes early in flower also. Live and learn.

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Pretty much, but the plant is no longer drawing N from the roots. Giving it N now will not change that. You're racing against the clock, hoping that the fan leaves stay on long enough to finish budding. If too many fall off before that time, the buds start eating away.

I've noticed that the more leafy and branchy the plant, the more it is prone to this.

Punk said:

Pretty much, but the plant is no longer drawing N from the roots. Giving it N now will not change that. You're racing against the clock, hoping that the fan leaves stay on long enough to finish budding. If too many fall off before that time, the buds start eating away.

I've noticed that the more leafy and branchy the plant, the more it is prone to this.

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If that is indeed the case, and I'm pretty much racing against the clock at this point, what do you suggest my next move is?

You'll be ok. I wouldn't say the plant takes up no N. BUT I would say it's not taking it up and storing it in the leaves anymore. Its working or focusing much more on flowers. However with the loss of N from the leaves it would pull up some of it when it needs it. It surely decreases the amount that's being pulled up in a perfectly healthy plant. Remember in the real world they die after flowering. That's why it won't focus on replenishing the leaves. It knows it's time is coming to an end. It has one thing to do flower and make seeds. That's why if you let plants go to long with no males eventually some female plants will throw some pollen. It wants to survive

Going through a similar situation, did you have luck stopping or reversing the yellowing?

Once they've gone yellowish that's it. All you can go is prevent it from getting worse.

Stutterfly said:

Going through a similar situation, did you have luck stopping or reversing the yellowing?

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Did you start with bloom nutes the day you flipped lighting?

goldberg71b said:

Did you start with bloom nutes the day you flipped lighting?

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Unfortunately yes. Noob move I know. I'm only 3.5 weeks into flower, they are pretty yellow. So no hope for reversal?

You can keep asking there answer isn't changing.

Just seems weird that only 3.5 weeks into flower there's no way to get green color back but alright.

Here's the deal. Most bloom nutes are to low in N and to high in P. I'm actually running a set now WITHOUT any bloom. Each brand is different. You might want to run veg nutes until the stretch ends then possible mix veg and bloom. You'll need to do research and tests. Or find someone who not only is or has used your nutes but also KNOWS what they are doing and ask them. It's taken me a few years to realize most of the nutes on the market have ratios that aren't good for this! No matter what their label says.

Stutterfly said:

Just seems weird that only 3.5 weeks into flower there's no way to get green color back but alright.

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I know how you feel. Trust me. You'd think someone would take the time to get a product that was closer to ideal. But if things were that easy everybody would be doing it.