Underperforming plants, various strains

[Rahz]

i doubt your feed ph of 6.8 is doing anything, if there is adequate lime in the media even if your feed ph is 6.8 within a few hours of watering the ph of your media will swing back to what it was at before you watered at 6.8. do you have a ph pen with the probe for inserting into the media to get its ph. run off ph is not an accurate measurement of the medias ph. although calmag cant hurt. however looking at your first picture if i were to guess i would say the ph of the media is more likely too low and what your seeing is a nitrogen deficiency due to low ph not for a lack of feeding i suspect.

I'll order one. Do you recommend the Bluelab or the Apera? The bluelab requires a pre-made hole and I assume the mode of action is for some amount of solution to enter the glass tube of the probe to get a reading? With the Apera the spear is the probe.

 

[Rahz]

Im still placing my bets on mediocre genetics for the plants that are underperforming. You can spend more time fine tuning everything and maybe they will perform slightly better, but I dont think they will meet your standards. You have plenty of growing experience and can clearly spot the difference between an excellent plant vs a mediocre one.

I'm not ruling that out. Purely conjecture but I wonder if all these new strains genetics are as stable as the old-school strains? At any rate, I'm going to get a soil probe and not rely on runoff. Probably seems silly but I hadn't checked for soil probes in years. All I found were the cheapo garden probes. Looks like the Bluelab probe was first available in 2019 and the Apera in 2020.

I'm also going to work in the cal-mag just because it seems like a reasonable thing to do.

 

[Thundercat]

While ph seems like it could definitely be some of the issue, I can’t believe no one mentioned temperature.

You said you run about 74degrees which is on the low side for LED lights and CO2. LED lights don’t put out the IR which warms the leaves and helps regulate transpiration. When LED first became popular there were tons of people having deficiencies that commonly just had cal/mag blindly thrown at it as a solution. After a few years it was discovered that raising temps into the low 80s actually would solve most of the issue without adding anything.

 

[Rahz]

While ph seems like it could definitely be some of the issue, I can’t believe no one mentioned temperature.

You said you run about 74degrees which is on the low side for LED lights and CO2. LED lights don’t put out the IR which warms the leaves and helps regulate transpiration. When LED first became popular there were tons of people having deficiencies that commonly just had cal/mag blindly thrown at it as a solution. After a few years it was discovered that raising temps into the low 80s actually would solve most of the issue without adding anything.

74 under the canopy. Thermostat set to 78. I'll look into that and probably bump the temps up. Thanks!

 

[thumper60]

74 under the canopy. Thermostat set to 78. I'll look into that and probably bump the temps up. Thanks!

Do you realize that the hp-cc should be run like Coir Ph 5.8-6.2 lots of watering never let dry out like soil never water with out nutes at least have cal-mag in the mix, An running your nutes have plenty of cal-mag handy week 4-6 of flower. I have been using promix for 4 decades I love it! I tried the hp-cc mix a few yrs ago hated it just could not seem to dial it in

 

[Blue brother]

Bad genetics all day long, while there's things you can obviously do to improve your game on your end, even badly treat decent genetics have frost of some level. Scrap those genes they aren't what you're looking for.