I was away traveling for the last four days and came back to this. My Blue Dream had some signs on lower leaves before my travels but now it seems to be spreading.
My Lemon Shining Silver Haze gets the same medium, feed and light and she absolutely thrives.
Medium: Soil (vegetable soil) / Coco (pH adjusted to 6.3)
Coco was initially unbuffered because of shitty product. Replanted them (6 weeks ago), then it was too late to turn back. I have been to giving extra CalMag to compensate 2 ml per/l. Last feed I boosted to 3.2 ml/L in order to reach 140–150 mg/L Cal, 45–50 Mag
Nutrients and water:
Distilled water + CalMag 2ml/l only up until week 3 of flower.
Then 60 distilled and 40 tap water +CalMag 1,5 ml/l.
As of today and forward only Tap water + CalMag 3.4 ml/l
**Tap water baseline:
Calcium: ~44 mg/L
Magnesium: ~6.8 mg/L
+3.4 ml Calmag : 140–150 mg/L Ca, 45–50 mg/L Mg (≈3:1 Ca:Mg)**
Supplements/Nutes
TerraAqua CalMag Bio Nova PK 13-14 Bio Nova N27 27-0-0 DIY Horsetail (Silica extract / gentle suppliment) in lacto bacteria + distilled water. 3 Weeks old. Also used as pH down.
Grow room ambiance
PPFD: 860-1100
CO2: Negative
Temp: 22-26.2 C / 71.6 - 79.1 f
Humidity: 40-57%
Pest: Tiny population of Fungus Gnats, on their way out. Stickeys + Nematoads incoming.
GROW LOG/ FEED
EC is in µS/cm
Example: 2000 µS/cm ≈ 1000 PPM on a 500 scale
Summary
May 30
Feed:
EC: 1350
Runoff:
LSSH: EC 2190 | pH 6.4
BD: EC 1924 | pH 6.0
BMR: ??? EC (too little runoff) | pH 6.4
June 2
Feed:
Volume per plant: 1.4 L
CalMag: 2 ml/L
EC: 0.650
pH: 6.3
Runoff:
LSSH: EC 2.520 | pH 6.7
BD: EC 1.339 | pH 6.6 (runs straight through)
BD Extra Soak: 400 ml | EC 1.908 | pH 6.5
BMR: EC 1.636 | pH 6.6 (heavier than others, smells of moist soil when watering)
June 4
Feed:
Volume: 3.6 L (approx. 30% tap water)
CalMag: 6 ml (~500 EC)
PK: 1 ml (~250 EC)
Silica Lacto: 3–4 tablespoons (~35 EC)
Note: Could not add more due to pH risk dropping below 6.2
EC: 0.785
pH: 6.2
Runoff:
LSSH: EC 2139 | pH 6.3
BD: EC 1687 | pH 6.3
BMR: EC 1240 | pH 6.4
June 7
Feed:
Test: 40/60 Tap/Distilled water
Volume: 2.8 L
Base EC: 0.185 (40/60 mix)
CalMag: 5.33g → EC 0.690
Silica Lacto: 2.5 tsp → EC 0.715
pH: 6.2
Runoff:
LSSH (900 ml old batch @ pH 6.3): EC 1945 | pH 6.9 (!)
LSSH (+900 ml new feed): EC 2164 | pH 6.5
BD (1.4 L): EC 1126 | pH 6.5
BMR: EC 1168 | pH 6.7
Extra Boost (All Plants):
3 L Tap + Distilled
CalMag: EC 0.560
PK (1.8g): EC 0.745
N27 (1g): EC 0.973
Silica Lacto: 5 tsp → EC 1.010
pH: 6.1
Final Runoff:
BMR: EC 2.305
BD: EC 1.650
LSSH: EC 2.159
June 10 (Watering Day)
Feed:
Total Volume: 2.5 L
1.1 L Tap + 1.4 L Distilled → EC 0.200
PK: 1.3 ml
CalMag: 5 ml
N: 0.3 ml
Silica Bacillus: 3–6 tsp
EC: 1.268
pH: 6.1
Runoff:
LSSH: EC 2.276 | pH 6.4
BD: EC 1.571 | pH 6.3
June 13 (Friday the 13th)
Feed:
1.1 L Tap + 2.9 L Distilled → EC 0.185
PK: 5.6g → EC 0.808
N27: 0.51g → EC 0.883
CalMag: 4g → EC 1.023
Silica Lacto: 3–4 tbsp → EC 1.330
pH: 5.9
Runoff:
LSSH: EC 2.909 | pH 6.4
BD: EC 1.800 | pH 6.2
Too low — gave 200–300 ml stronger extra feed
Extra Feed to BD: EC 2.900
BD Second Runoff: EC 2.534
CREW EXPANDABLE…
June 17
Feed:
2.8 L Tap Water
CalMag: 8.9 ml → EC 1.000
Target: 140–150 mg/L Ca, 45–50 mg/L Mg (≈3:1 Ca:Mg)
I think it’s the horsetail. You are running in Coco yet it sounds like you’re trying to break down horsetail like soil for silica . Silica would create a bond first to the water then the calmag would bond to that chain. If something goes wrong in this bonding, you could create all sorts of problems with your feed. Cheers !!!
you posted lots of info about the conditions but you forgot the most important one PH what is it i do see it posted you have a lock out is my guess correct the PH and problem goes away
I’m not sure exactly sure how you’re breaking down the horsetail. But I think it’s probably contributing to nutrient lockout or pH issues. I’m not sure if you’ve successfully used horsetail in a mixed media situation like this before with success ? I normally would see that in a soil medium. Are you sure you don’t see signs of this starting on the healthy plant on the fan leafs ?
I would do a slurry test to see PH of the medium. A lot of opinions on mixed mediums being good and bad. I’ve never really done mixed mediums like this. It’s a bit difficult as soil requires a higher pH than Coco. Mixing the two becomes a bit difficult to control pH fluctuations. Added to that the horsetail is probably contributing to those PH fluctuations or just potentially locking out all the nutes. Generally, when people do 50-50 soil/Coco, they have a target PH lower than 6.3 but that’s because you will lock out Cal mag at higher pH in Coco.
Not sure exactly what your problem is but this stood out to me…
Did a quick look at these and they contain no micro nutrients? I couldn’t find a picture of the labels (wtf nutrient companies???) but their feed charts have base nutrients for these.
this product contains 27% nitrogen (N), of which 13% NO3, 7% NH4, and 7% NH2. Besides nitrogen, N 27 also contains 1% Magnesium (MgO) and the trace elements iron, manganese and copper.
Your nutrients are cleated. They are designed to be absorbed immediately by the plant. They don’t need any process. They are readily available. When you have things like the horsetail that needs to be broken down so that it can become available it’s competing with readily available nutrients. Silica is the primary bond in the water chain. This combination of cleated and non-cleated especially on the primary bonding of silica to water would be my concern. How do you know when the horse tail has broken down enough to be available to take the primary bond to the water ? What if it’s still breaking down and doesn’t take the primary bond that could potentially allow for a nutrient lockout immediately. Silica, forcing all the other nutrients to fall out and reeking havoc on the PH just my thoughts…
I dried, cut and grinded the horsetail and then placed it in a jar of distilled water and homemade Bokashi tea + molasses (sugars and minerals for the lacto bact to eat and reproduce). After about 3 weeks the lacto bacteria has broken down the horsetails (Nitrogen, Silica and so on) to ready nutients. Or at least that is what I have learned. The EC of the Silica tea sits around 6500 EC (!!!) when raw. I only add around 0.100 - 0.200 EC of it to my feed. I Water with 6.0 - 6.3 pH
🪽🪽🪽
out going forward!
