Problem: Brown blotches on lower leaves of plant (Blue Mystic) (probably noticed this about a week ago). To me, it looks like a case of phosphorus deficiency – but I’m not sure. Also, not sure of the cause: lack of phosphorus or lockout.
I haven’t had much for nutes (first light dosage yesterday after 4 weeks since planting). However, my runoff has a consistently high EC (2,600-3,000 uS/cm, 2.6-3.0 mS/cm). Makes me wonder if it’s lockout. Runoff pH has been fairly stable: around 6.4-6.9.
Not sure where to go from here. I could try bumping up the bloom nutes to get more phosphorus, but if the issue is lockout then I’ll be making things worse. If it is lockout, should I do a huge watering (pH’d of course) to try and wash salts out?
I’m a bit worried about the high EC of the runoff water. However, I’ve read that the runoff EC for soil can be quite high so maybe I’m overthinking it.
Another issue is that one plant (Northern Light) looks like it has clawed leaves and stunted. Nitrogen toxicity?
Medium/grow method: Soil. Blend of
OF, Happy Frog, additional Perlite, and Black Gold Seedling Mix (1 Part OF, 1 Part Happy Frog, 1 Part Perlite blended). In the center of the pot, a couple handfuls of seedling soil mix was used to prevent hot soil from burning seedlings initially.
Each plant is potted in a 3 gallon cloth grow bag and is located in a home-made tent (reflective insulation, PVC pipe structure, 4’x4’).
Feed and supplements used: Up until yesterday, just pH’d water (between 6.2-6.6). Total EC after pH adjustment was between 160-180 uS/cm (0.16-0.18 mS/cm). Yesterday, I added some nutrients (Humboldt Grow @ 0.17 mL/L, Micro @ 0.17 mL/L, Bloom @ 0.08 mL/L). Total EC of feed water was around 340 uS/cm (0.34 mS/cm).
I’ve been watering once every six days or so; I wait for the top of the soil to be dry. Most waterings are around 2-3L per plant with 10-20% runoff. About a week and a half ago, I did a larger watering (~4L per plant with 30-40% runoff) to try and see if I could reduce the runoff EC. It was still high at approx. 2.6 mS/cm.
Water source: Tap water with a relatively low EC (160-180 uS/cm). Usually try to let water sit for a few hours to dechlorinate and equilibrate with ambient temps.
Strain/age: The two plants with brown blotches are Blue Mystic AF. The stunted plant with the claws is Northern Light AF. They are 4 weeks old since the seeds were planted.
Light used: Blurple LEDs. One large unit (268W actual draw) and two smaller lights (23W actual draw each). Total of 314W draw for 8 plants. I’ve been running 20/4. Been around 18” from top of plants.
Climate: Been having some hot and cold weather which has been influencing my indoor temps. This past week it’s been a bit cool. 63F, 60% RH without lights, 73F, 50% RH with lights. A week ago, temps were much warmer, up to 91F. Have two clip on fans (one intake, one exhaust).
I haven’t had much for nutes (first light dosage yesterday after 4 weeks since planting). However, my runoff has a consistently high EC (2,600-3,000 uS/cm, 2.6-3.0 mS/cm). Makes me wonder if it’s lockout. Runoff pH has been fairly stable: around 6.4-6.9.
Not sure where to go from here. I could try bumping up the bloom nutes to get more phosphorus, but if the issue is lockout then I’ll be making things worse. If it is lockout, should I do a huge watering (pH’d of course) to try and wash salts out?
I’m a bit worried about the high EC of the runoff water. However, I’ve read that the runoff EC for soil can be quite high so maybe I’m overthinking it.
Another issue is that one plant (Northern Light) looks like it has clawed leaves and stunted. Nitrogen toxicity?
Medium/grow method: Soil. Blend of
OF, Happy Frog, additional Perlite, and Black Gold Seedling Mix (1 Part OF, 1 Part Happy Frog, 1 Part Perlite blended). In the center of the pot, a couple handfuls of seedling soil mix was used to prevent hot soil from burning seedlings initially.Each plant is potted in a 3 gallon cloth grow bag and is located in a home-made tent (reflective insulation, PVC pipe structure, 4’x4’).
Feed and supplements used: Up until yesterday, just pH’d water (between 6.2-6.6). Total EC after pH adjustment was between 160-180 uS/cm (0.16-0.18 mS/cm). Yesterday, I added some nutrients (Humboldt Grow @ 0.17 mL/L, Micro @ 0.17 mL/L, Bloom @ 0.08 mL/L). Total EC of feed water was around 340 uS/cm (0.34 mS/cm).
I’ve been watering once every six days or so; I wait for the top of the soil to be dry. Most waterings are around 2-3L per plant with 10-20% runoff. About a week and a half ago, I did a larger watering (~4L per plant with 30-40% runoff) to try and see if I could reduce the runoff EC. It was still high at approx. 2.6 mS/cm.
Water source: Tap water with a relatively low EC (160-180 uS/cm). Usually try to let water sit for a few hours to dechlorinate and equilibrate with ambient temps.
Strain/age: The two plants with brown blotches are Blue Mystic AF. The stunted plant with the claws is Northern Light AF. They are 4 weeks old since the seeds were planted.
Light used: Blurple LEDs. One large unit (268W actual draw) and two smaller lights (23W actual draw each). Total of 314W draw for 8 plants. I’ve been running 20/4. Been around 18” from top of plants.
Climate: Been having some hot and cold weather which has been influencing my indoor temps. This past week it’s been a bit cool. 63F, 60% RH without lights, 73F, 50% RH with lights. A week ago, temps were much warmer, up to 91F. Have two clip on fans (one intake, one exhaust).
-- I don't know what's up with that high ppm run-off, but it's not all necessarily nute salts,... OF is pretty rich, but it's also a very suspect soil these days,..(noted, your blending of it, so this isn't too hot)... hands down the [HASHTAG]#1[/HASHTAG] problem soil I see here! Straight OF for seedling is too hot usually, but that's not the case here,... In the past I've tested bags with an Accurate 8 soil pH probe, and they were in the low 5's 
.... their quality is iffy at best, so in the future, switch to another brand,...
-- phat haul mate, nicely done! 
.......... look into Royal Gold King's Mix, a new soil I'm trying right now,.. liking it a lot!
