I've looked through the pinned threads at the top of this forum and have come to the conclusion I may have a calcium deficiency. Though none of the reasons listed therein are applicable.
Setup:
50 gal ebb and gro system.
10 plants under 1000 watts.
Grow tent 8x5x6.5
Oscillating fan set to low, blowing above canopy.
Light hung 24" above even canopy.
7-8 weeks old. Forgot to write it down.
Humidity 40-65% (mostly 40.)
Temp 65-79, 65 at night, 79 at highest right before lights off.
12/12 light cycle
Strain: ak47
PH has been surprisingly rock solid throughout. 5.8 once set and soaked in, never varied more than .1 from day to day.
Res. changed and cleaned every 100 gallons.
Plants started at 400 PPM and were brought to 1450 PPM at peak. I use Gen. Hydroponics Bloom and Micro, Lucas' formula. Growth had shown no issues or troubles.
Until I started finding leaves like the ones posted below. At first I thought spider-mites. No corpses stuck to the oh so sticky nugs and none found under 40x jewelers loupe.
I think it's calcium related as they are the only images in the diagnostic threads that seem to match what I have going on.
The problem:
Deficiency: First visible in newer growth, leaf tips will die, tips may curl, growth is stunted. there will be a weakness in stems/branches. underdeveloped roots, and bacteria problems can arise. *can be cuased by too much potassium/nitrogen* calcium deficiency is commonly mistaken for over ferting. its key to notice in these pics that early stages of deficiency appear in the serrated edges/tips of the leaves, but its not just a death/necrosis, its a small circular spots of death, not just burn marks. young leaves will develop dwarfing, a strap-like shape, and shoots stop growing and thicken.
Leaf tips are fine, pointy but not crisp or twisting. Branch weakness is hard to judge as the buds have become quite heavy. Stems seem of normal rigidity. Roots are healthy and white, though slightly stained with nutrient solution. Maybe 1450 was to much for them? Nitrogen levels may have been too high. I saw no damage to the leaf edges and many leaves show only the small circular spots mentioned. New leaf growth has ceased so I cannot say.
I'm 7-8 weeks into flower and they've been in fresh, PH'd water, for 4 days. The problem only seems to be getting worse.
Anyone able to offer any insight?
Sorry for posting at length and thanks for your consideration.
Please ignore wilting and and leaf tip dryness. Took too much time between plucking them and taking photos.
Setup:
50 gal ebb and gro system.
10 plants under 1000 watts.
Grow tent 8x5x6.5
Oscillating fan set to low, blowing above canopy.
Light hung 24" above even canopy.
7-8 weeks old. Forgot to write it down.
Humidity 40-65% (mostly 40.)
Temp 65-79, 65 at night, 79 at highest right before lights off.
12/12 light cycle
Strain: ak47
PH has been surprisingly rock solid throughout. 5.8 once set and soaked in, never varied more than .1 from day to day.
Res. changed and cleaned every 100 gallons.
Plants started at 400 PPM and were brought to 1450 PPM at peak. I use Gen. Hydroponics Bloom and Micro, Lucas' formula. Growth had shown no issues or troubles.
Until I started finding leaves like the ones posted below. At first I thought spider-mites. No corpses stuck to the oh so sticky nugs and none found under 40x jewelers loupe.
I think it's calcium related as they are the only images in the diagnostic threads that seem to match what I have going on.
The problem:
Deficiency: First visible in newer growth, leaf tips will die, tips may curl, growth is stunted. there will be a weakness in stems/branches. underdeveloped roots, and bacteria problems can arise. *can be cuased by too much potassium/nitrogen* calcium deficiency is commonly mistaken for over ferting. its key to notice in these pics that early stages of deficiency appear in the serrated edges/tips of the leaves, but its not just a death/necrosis, its a small circular spots of death, not just burn marks. young leaves will develop dwarfing, a strap-like shape, and shoots stop growing and thicken.
Leaf tips are fine, pointy but not crisp or twisting. Branch weakness is hard to judge as the buds have become quite heavy. Stems seem of normal rigidity. Roots are healthy and white, though slightly stained with nutrient solution. Maybe 1450 was to much for them? Nitrogen levels may have been too high. I saw no damage to the leaf edges and many leaves show only the small circular spots mentioned. New leaf growth has ceased so I cannot say.
I'm 7-8 weeks into flower and they've been in fresh, PH'd water, for 4 days. The problem only seems to be getting worse.
Anyone able to offer any insight?
Sorry for posting at length and thanks for your consideration.
Please ignore wilting and and leaf tip dryness. Took too much time between plucking them and taking photos.
