New Grower, Some Sort of Deficiency

[HEAVY_CA]

Lights - Kingbrite 125w Qb288 V2 Lm301b 3500k w/ 660nm
Seeds - Lemon Pie CBD Auto Fem (left) and Peachy CBD Auto Fem (right) from WWSB
Ventilation - 4" TerraBloom ECMF-100, 4" G-Hydro Carbon Filter, 2x 6" non-oscillating fans, one on bottom corner blowing down and low speed, one on floor blowing up at low speed, bottom vent opposite exhaust duct open slightly for passive airflow
Soil - 1:1:1 EB Stone Recipe 420/Fox Farms Ocean Forest/Perlite
Pots - 3 gallon fabric pots on top of caddies sitting in 10" saucers

Plants are about 5 weeks old, no nutes used this whole time, only been watering with 24 hour tap water every 48 hours. Only the smaller plant is showing any signs of deficiencies, the other is completely fine.

Is this a Cal-Mag deficiency and is it too late to stop the damage? It literally looked fine only a couple days ago. I'm trying to stay organic as possible so I'm worried about killing the microbes in the soil with bottled nutes. I left room in the pots to top dress and have more Ocean Forest, Recipe 420, and earthworm castings.

 

[Bluugrss]

Check soil ph.....ocean forest is known to be problematic

 

[HEAVY_CA]

Check soil ph.....ocean forest is known to be problematic

Does it make sense that one plant is having issues and the other is completely fine? Exact same soil mixture and watering for both plants.

 

[Bluugrss]

Does it make sense that one plant is having issues and the other is completely fine? Exact same soil mixture and watering for both plants.

Not really, but I'd start with ph'ing the soil in order to help narrow down issues.

 

[Waira]

-- P defc starting, highest demand is now, and that soil blend is not made to be full cycle water only... Start bloom nutes now, a good base bloom with complete nute profile, not just a PK booster....
...it's not unusual at all, each strain, even pheno' will have variable demands and tolerances,... Each pot is it's own little ecosystem too, nothing stay the same between pots...

 

[HEAVY_CA]

-- P defc starting, highest demand is now, and that soil blend is not made to be full cycle water only... Start bloom nutes now, a good base bloom with complete nute profile, not just a PK booster....
...it's not unusual at all, each strain, even pheno' will have variable demands and tolerances,... Each pot is it's own little ecosystem too, nothing stay the same between pots...

Life has been crazy for the past couple weeks and I haven't been able to think about the plants much. I even missed 2 watering days so the plants had to go 72 hours without water twice. I feel really bad, the leaves on both plants have gotten much worse, it looks like 40-50% of them are yellowing, browning, and curling upwards. The larger plant is now doing worse than the smaller one. They both smell great, but I am worried I am too late to address this and they won't make it to harvest.

I need to run out to the hydroponics store to buy nutrients. I have about 1.5-2" of space left on top of each fabric pot. Can I top dress them with OF or EWC tomorrow and then pick up bloom nutes in a day or two? Or am I already too late to save the plants? Plants are almost 7 weeks old, I really want to make it to harvest.