ColonelBlake
Well-Known Member
Hello All.
This is my first grow. I'm currently growing in a well ventilated greenhouse in Michigan ( legal 12 plant grow ). My plants are currently 6-7' tall. The specifics of my grow are at the bottom.
I've been experiencing lower to mid leaf yellowing issues for at least a month now. It started out looking like a Nitrogen deficiency, but now it looks like a potassium deficiency ( since they are flowering ). I'm pretty sure it's a mobile macro nutrient deficiency as @Emilya noted in another thread ( https://www.420magazine.com/community/threads/noob-with-possible-ph-issues-soil.470048 ).
I've been giving my plants some nutrients. Not allot by any stretch. So I'm wondering if I need to kick it up a notch ( esp given the size of the plants ). I've been pretty cautious this entire grow - nutrient and watering wise. Mainly because of what I've read on this forum ( i.e. water when dry, and don't overfeed ).
I started out doing a feed, water, feed, water, etc schedule. I've since moved to a feed (100%), partial feed (50%), full, partial, etc. I started doing this recently - a little over a week now., but I haven't noticed much progress yellowing wise. It's the same or possibly getting worse. I'd guess that each plant has 2-3 dozen yellowing leaves atm. Several leaves fall off every plant daily ( completely shriveled up and brown ). That said, the top 2/3 of the plant looks good and seems to have allot of vigor.
I'm currently using General Hydroponics Trio for nutrients. I bought a gallon of each so I'd like to use them up unless it truly a problem.
Current nutrient feed:
Full feed ( early flowering ): 4ml/gal micro, 1ml/gal grow, and 5ml/gal bloom. ~450ppm ( more if I add calmag - or use more well water ).
Partial feed: 50% of a full feed. ~225 ppm.
This is done using the full feed, partial feed, full, partial schedule as noted above ( every 2.5 days or so ).
A few other tidbits:
*Plants have been in the present container for ~3 months ( 20/gal fabric pot ).
* I really don't think this is a watering issue. I've been pretty good ( not perfect ) about not watering until the soil gets pretty dry - not completely dry though.
* Plants were put on pot elevators recently.
* I use straw for mulch. I sprinkle DE on the straw ever week or less.
* Plants get 6 hours of light.
* I've done a dozen soil ph samples and the ph is usually right around 7.0 ( +/- .2 ). I use a slurry test to determine the ph.
Grow medium: Soil ( made myself - 40% compost, 30% sphagnum peat moss, 30% perlite ). Mixed by hand..
Container: 20 gallon fabric pots.
Grow area: 8x20' greenhouse. 8' ceiling.
Water: 80-90% RO, remaining is well water.
Water frequency: Every 2.5 days currently. ~3 gallons of water per plant each watering.
Plants: 6 gorilla glue, 6 purple chem ( started as clones ).
State: Early flowering.
Planted: Early May ( 3.5 months old ).
PH: Soil ph is 7-8. Water ph: 6.2-6.3. .
Nutes: GH Trio.
Thank you for reading my post, and thanks in advance for any advice!
This is my first grow. I'm currently growing in a well ventilated greenhouse in Michigan ( legal 12 plant grow ). My plants are currently 6-7' tall. The specifics of my grow are at the bottom.
I've been experiencing lower to mid leaf yellowing issues for at least a month now. It started out looking like a Nitrogen deficiency, but now it looks like a potassium deficiency ( since they are flowering ). I'm pretty sure it's a mobile macro nutrient deficiency as @Emilya noted in another thread ( https://www.420magazine.com/community/threads/noob-with-possible-ph-issues-soil.470048 ).
I've been giving my plants some nutrients. Not allot by any stretch. So I'm wondering if I need to kick it up a notch ( esp given the size of the plants ). I've been pretty cautious this entire grow - nutrient and watering wise. Mainly because of what I've read on this forum ( i.e. water when dry, and don't overfeed ).
I started out doing a feed, water, feed, water, etc schedule. I've since moved to a feed (100%), partial feed (50%), full, partial, etc. I started doing this recently - a little over a week now., but I haven't noticed much progress yellowing wise. It's the same or possibly getting worse. I'd guess that each plant has 2-3 dozen yellowing leaves atm. Several leaves fall off every plant daily ( completely shriveled up and brown ). That said, the top 2/3 of the plant looks good and seems to have allot of vigor.
I'm currently using General Hydroponics Trio for nutrients. I bought a gallon of each so I'd like to use them up unless it truly a problem.
Current nutrient feed:
Full feed ( early flowering ): 4ml/gal micro, 1ml/gal grow, and 5ml/gal bloom. ~450ppm ( more if I add calmag - or use more well water ).
Partial feed: 50% of a full feed. ~225 ppm.
This is done using the full feed, partial feed, full, partial schedule as noted above ( every 2.5 days or so ).
A few other tidbits:
*Plants have been in the present container for ~3 months ( 20/gal fabric pot ).
* I really don't think this is a watering issue. I've been pretty good ( not perfect ) about not watering until the soil gets pretty dry - not completely dry though.
* Plants were put on pot elevators recently.
* I use straw for mulch. I sprinkle DE on the straw ever week or less.
* Plants get 6 hours of light.
* I've done a dozen soil ph samples and the ph is usually right around 7.0 ( +/- .2 ). I use a slurry test to determine the ph.
Grow medium: Soil ( made myself - 40% compost, 30% sphagnum peat moss, 30% perlite ). Mixed by hand..
Container: 20 gallon fabric pots.
Grow area: 8x20' greenhouse. 8' ceiling.
Water: 80-90% RO, remaining is well water.
Water frequency: Every 2.5 days currently. ~3 gallons of water per plant each watering.
Plants: 6 gorilla glue, 6 purple chem ( started as clones ).
State: Early flowering.
Planted: Early May ( 3.5 months old ).
PH: Soil ph is 7-8. Water ph: 6.2-6.3. .
Nutes: GH Trio.
Thank you for reading my post, and thanks in advance for any advice!
Thank you in advance!
