ethcan
- 152
- 63
Hey everyone. I am having an issue that has been plaguing me for quite some time now.
I don't know what I'm doing wrong even after a thorough reflection, so I'm reaching out to see if someone can help me out.
Basically what occurs is a slowing of the growth and a very intense yellowing from the top down. If left on automatic daily irrigation, the plant will die once in flower. I will attach as many photos as I can of the symptoms.
This same symptomology has been occuring my flower rooms as well. I basically axxed 30% of my yield this last flower run due to plants looking like this. Previously in these flower rooms I was fertigating twice a day (probably way too much, I wasn't measuring how much runoff I was getting) and plants that took on this symptomology would look worse and worse and worse, until they would eventually just wilt dry and die.
I'm going to list all my variables and make it very easy to understand my plants.
-Nutrients
Jacks in the 321 formula
Power SI
Heavy 16 Roots
Hypochlorous Acid (Athena Ag Cleanse)
Phosphoric Acid for pH Down (Used rarely)
Potassium Bicarbonate for pH Up (Used often)
-Sprays
Plant Therapy every 3 days
Spinosad
Azaguard
-Media
~1.1gal (4L) of Char Coir coco perlite 50/50 mix.
-Lighting
Gavita DE 1000w HPS/MH
-High CO2 (1100ppm)
-VPD: I try to keep it around ~1.0kpa
-80*F 65%-70% relative humidity
-lots and lots of air movement.
Watering Habits:
I was previously watering daily in this room with enough water to produce 20% runoff. I was doing this through my drip system. When the yellowing began to come in full force, I thought "overwatering" and have now been picking each plant up daily and feeding when it is significantly lighter than full saturation but does not look dry (allowing dry downs but not too dry)
Currently they are being fed (starting with RO water)
pH 5.8
EC 1.4mS
Jacks 321
Power SI
Roots
Cleanse
I have runoff collectors and I am getting constant readings of
pH 6.4
EC 2.2
It is worth noting that I pulled a few of the sick plants out of their pots and did observe less developed root systems than some of the healthier ones, although this was NOT a universal rule as there were also yellow plants with great pearly white dense root systems.
Also you will note some spray damage. That was caused by a foliar feed recipe with a pH far too acidic. That has now been rectified.
Some of my theories are,
I initially overwatered this crop by giving daily irrigations too soon.
I then backed off too much out of fear of overwatering, and allowed them to dry, allowing salts to build.
Now they are locked out as hell and I have no idea how to fix them.
Each day they are not seeming to be improving. I ensure good runoff at each feeding and am allowing a bit of a dryback to ensure I'm not overwatering.
A few of the severely yellow plants that were clearly stunted also had very poor stabilizer roots and the trunk would swing with the fans. It needed a stake.
Am I just in need of a really really high volume flush and then up my EC?
How I'm used to my rooms looking... This is stressful!
I don't know what I'm doing wrong even after a thorough reflection, so I'm reaching out to see if someone can help me out.
Basically what occurs is a slowing of the growth and a very intense yellowing from the top down. If left on automatic daily irrigation, the plant will die once in flower. I will attach as many photos as I can of the symptoms.
This same symptomology has been occuring my flower rooms as well. I basically axxed 30% of my yield this last flower run due to plants looking like this. Previously in these flower rooms I was fertigating twice a day (probably way too much, I wasn't measuring how much runoff I was getting) and plants that took on this symptomology would look worse and worse and worse, until they would eventually just wilt dry and die.
I'm going to list all my variables and make it very easy to understand my plants.
-Nutrients
Jacks in the 321 formula
Power SI
Heavy 16 Roots
Hypochlorous Acid (Athena Ag Cleanse)
Phosphoric Acid for pH Down (Used rarely)
Potassium Bicarbonate for pH Up (Used often)
-Sprays
Plant Therapy every 3 days
Spinosad
Azaguard
-Media
~1.1gal (4L) of Char Coir coco perlite 50/50 mix.
-Lighting
Gavita DE 1000w HPS/MH
-High CO2 (1100ppm)
-VPD: I try to keep it around ~1.0kpa
-80*F 65%-70% relative humidity
-lots and lots of air movement.
Watering Habits:
I was previously watering daily in this room with enough water to produce 20% runoff. I was doing this through my drip system. When the yellowing began to come in full force, I thought "overwatering" and have now been picking each plant up daily and feeding when it is significantly lighter than full saturation but does not look dry (allowing dry downs but not too dry)
Currently they are being fed (starting with RO water)
pH 5.8
EC 1.4mS
Jacks 321
Power SI
Roots
Cleanse
I have runoff collectors and I am getting constant readings of
pH 6.4
EC 2.2
It is worth noting that I pulled a few of the sick plants out of their pots and did observe less developed root systems than some of the healthier ones, although this was NOT a universal rule as there were also yellow plants with great pearly white dense root systems.
Also you will note some spray damage. That was caused by a foliar feed recipe with a pH far too acidic. That has now been rectified.
Some of my theories are,
I initially overwatered this crop by giving daily irrigations too soon.
I then backed off too much out of fear of overwatering, and allowed them to dry, allowing salts to build.
Now they are locked out as hell and I have no idea how to fix them.
Each day they are not seeming to be improving. I ensure good runoff at each feeding and am allowing a bit of a dryback to ensure I'm not overwatering.
A few of the severely yellow plants that were clearly stunted also had very poor stabilizer roots and the trunk would swing with the fans. It needed a stake.
Am I just in need of a really really high volume flush and then up my EC?
How I'm used to my rooms looking... This is stressful!
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