1st Grow, 1st post, Yellowing leaf centers, need some advice

Grow Cycle
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Much respect to the veterans and pros, I need some guidance. Skipping the newbie pleasantries and jumping in feet first.

The short story: My 25 day old buddies, have yellow leaf centers. I’ve been creeping up to 100% out of an abundance of caution but I’m guessing the issue may go away when I hit 100% feeding strength but would like feedback. (yes I see some edge curling too, I had some hot days, I thought that was the problem and I’ve corrected, but would like feedback on that as well)

The long story:
My issue: As I hope you can see in the photos below, my 25 day old plants are yellowing on the leaves between the veins. It’s very early and I think it’s very correctable. These are bag seeds, I have no idea what strain they are and no idea if they are male or female or auto. This is just to test my aptitude.

My environment: Controlled. Indoor tent, 440CFM circulation, ViparSpectra 700 dimable, (100% blue 100 white 80% red 280-ish WATTs currently) 35" from ground. Small fan for blowing over the tops of the plants. Temp 77 F when lights are on, 68 F lights off (I had three hot days over the last week at 82 but I corrected the intake fan schedule). 19.5on/4.5 off lighting schedule.

My feeding: About 400ml (most of a 16z solo) per feeding. 2-3 days apart. The last three feedings I went from 25%, 50% I just fed 75% strength today. Reverse Osmosis water out of jug Ph6.4 9ppm. Using 2 liters ROWater, Advanced Nutrients Bloom 6ml, Grow,6ml, Micro,6ml - Beginner B-52,3ml + Voo Doo Juice,3ml. PH UP 3 ml. Ph corrected back to 6.4-ish. PPM 810-ish. I also spray the plants with the nute solution to feed the foliage. Next feed 100% for the rest of VEG (3.5-4 more weeks, 5.5 total) Expecting 1200ppm when I feed 100%.

Blue pots are 1.1 gal and have many large holes drilled all around for oxygen. Bag pots are 3 gal smart pots.

Well that was a mouthful. I keep detailed records of all tent interactions so I hope this wasn’t overkill but would appreciate any advice.

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You can skip somethings but we really need this info. All of it, please!

COPY/PASTE: This “Support Ticket” into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA

Strain; Type, Bag seed, ILGM… name of strain:

How many plants:

Age from Sprout and Flower:

Soil in pots, Hydroponic, or Coco / Brand and type of Soil & Size of Pots:

How often do you water and how do you determine when to do so?

PH of water and runoff or solution in reservoir:

What is strength of nutrient mix? EC, or TDS:

Indoor or Outdoor:

Light system, size and height from plants:

Temps; Day, Night:

Humidity; Day, Night:

Ventilation system; Yes, No, Size:

AC, Humidifier, De-humidifier:

Co2; Yes, No:

Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you

Also here is a Deficiencies & Excesses Chart to help you identify what is wrong with your plants

deficiencies
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Nutrient_Chart2

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@EclecticJack this

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That’s a good photo chart. I feel like I’m on the early stages of low nitrogen and I should bring my Ph up from 6.4 to 6.6. My thoughts are I’m under-watering and under-nuteing. I think I should be getting 2-4 days between watering.

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Looking for some experts before everyone starts watching first day of Football LOL.
I recopied this “Support Ticket” to make sure it was in-line with post. If I’m in the wrong forum, please feel free to let me know and I’ll repost in the right place

Leaf yellowing is progressing so feedback would be greatly appreciated. I’m going to have to use my own judgement and as a rookie, it could have bad results. I’m thinking my water needs to come up to about 6.6 to allow the elements in that one photo to flow better. I was thinking about this last night: They might not be under fed, they might not be getting what I’m feeding them.

Strain; Type, Bag seed, ILGM… name of strain: Unknown strains. Plucked from low grade bags

How many plants: 6

Age from Sprout and Flower: 25 days as of photo

Soil in pots, Hydroponic, or Coco / Brand and type of Soil & Size of Pots: Pro Mix HP

How often do you water and how do you determine when to do so? roughly 1-2 days. If they soil looks dry I finger check to first knuckle and make a judgement call on if it would make 24 more hours.

PH of water and runoff or solution in reservoir: Have never had run off thus far. Feeding Ph is 6.4-6.5. I have a digital PH meter and test with drops. Feeding 400ml for 1.1 gal pot and for my 3 gal. Planning to increase to 800ml or more but feedback is needed.

What is strength of nutrient mix? EC, or TDS: today 75% was 810ppm AFTER PH-ing. Pre ph was 775-ish.

Indoor or Outdoor: indoor

Light system, size and height from plants: 25"-27" depending on the plant. Single Model: ViparSpectra 700w dimmable Blue, White, Red. VEGGING: Actual used wattage today as of photo is 285w with Blue 100% White 100% Red 80%. (Light max is 315w. Will increase Red to 100% for Flowering) 19.5 hours power on 4.5 hours off as of photo.

Temps; Day, Night: day 77, night 68. slight temperature spikes last week (days 20-23) to 82F. controlled by setting intake fan to never turn off.

Humidity; Day, Night: last 24H 43-65% humidity. I fed and sprayed some plants yesterday if that counts toward humidity.

Ventilation system; Yes, No, Size: 6" ducting, Carbon filter, 440CFM fan. 4x4x7 tent. Additional “desk fan” for blowing the tops of the plants.

AC, Humidifier, De-humidifier: No to all three.

Co2; Yes, No: No. But considering it.

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@EclecticJack tagging people like I just tagged you makes it easier for us to know you have posted!

The numbers look pretty good.

The company that makes your nutrients most likely has a feeding chart on their website that has recommended amounts to give and a TDS or ec reading that they recommend.

I believe promix is a soil less mix and your pH should be 5.8 adjusted after adding nutrients. (Check your bag and either write back a list of ingredients or post a pic of ingredients from bag, please)

Using the Fox farms chart as a reference they recommend low 1200 to high 1400 ppm TDS at that age.

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@bob31 This is a shot of the HP Pro Mix bag. I can upload the Advanced Nutrient labels if needed.
As a rookie I prepared myself in case of total loss. So am I wrong to treat HP pro mix as soil (using soil measurements)? You’re saying I should treat it more like hyroponic’s numbers?

I’ve been in the pH range of 6.3-6.45 in an attempt to stay close to 6.5. Based on the chart, today I gave the plants water only at 6.75 to help move a little more P, Ca, and Mg up the pipeline. (Thinking soil)

If you’re correct, then I’m guessing the plants will not be happy in the morning.

  • on the plus side, if you’re correct: My water+nutes pH down to 5.5-ish before pH-ing up to the 6.4 range. This would save a lot of pH-ing.

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It does contain dolomite lime. But how much… so the best bet is to do a slurry test. Get an ounce of pH 6.5 water in a glass. Add a large tablespoon of the promix to it stir in good and test the pH after about 5 minutes or so.

That will be the truth test. My understanding though is that all promix is treated as a soiless mix and water with pH 5.8

Please tag me after you do the test @EclecticJack

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@bob31 I multiplied your test by 5 to get enough test water.
My start water was 6.52 I used 5z water and 5 tablespoons of Pro Mix
The photos didn’t upload in order but the file name shows order.
Mix sat for about 10-15 mins, stirred it a little

  • The Pro Mix dragged me down to 6.0ph with slurry…I strained the slurry with similar results.
  • 196 ppm

Yes, my nute brand does have a calculator based on total water used, but no PH info.
Now I’m left wondering: What should my feeding PH be?

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You should go with 5.8 pH @EclecticJack Some nutrient manufacturers specify a pH for their products, buy many don’t.

There are really just two working pH zones that we use. 5.8 for soiless and 6.5 for soil. Those numbers are very specific and the more exact you can be on that the happier your plants will be!

Nutrient_Chart2

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@bob31 Ok, I’m going to bring it down. After last night’s water feeding they look OK, but a little strange at the same time. Yet they continue to produce new foliage. They are loving light, and reaching high. I’m pretty sure there no permanent issues.

Now the rookie question: I’ve been consistent with my numbers had I known ProMix was not soil I would have kept my numbers lower from the start. Why is HP Pro Mix not considered soil? Is its definition closer to that of Coco Coir? You don’t have to type out a reply but if you can suggest a link that would be great.

I’m eager to bring it down but I don’t want to rush. Day 27 and I see no reason to start over just yet. I’ll post to here once I feed again which might be tomorrow night depending on moisture.

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It is considered soiless because there is no actual soil in it. @EclecticJack

Sometimes soil is called “Composted forest products”

They will pick up once they start getting the proper pH

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I’ll jump in here @EclecticJack
I’m using promix as wel and I’ve been watering @ 6.1-6.3 no issues
I am using organic nutrients that need to be in that range tho
You may want to lower you ph just a few point :+1:

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Didn’t tag anyone but just wanted to add a note in case any were watching: Fed them what came out to 5.9 ph same 75% mix I mentioned up above. Probably won’t have time to post til about 48 hours from now so wish the kids luck! #Cliffhanger

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@bob31 @Countryboyjvd1971 Gentlemen, thank you for the advice. The kids are doing much better. It seems like they jumped into hyper drive. My nodes are sprouting in their corners some are already 3/4" long and that only happened in the last 3 days. The water leaves have thicker stems than any previous sprouts and the stalk is becoming a trunk. It’s probably taking up the nutes and loving it. I’ll post a photo tomorrow! Thanks again!