roots_indoors
Member
Hey RIU! I have a question regarding some brown spots on a few of my leaves. These spots only occur on a few leaves, and on my other plant (both Bruce Banner) it is showing no signs of these brown spots. This has slowly occurred over the past two weeks. I am not too worried about it since I've got about 3-4 weeks left, and half of that time will be spent flushing. But I am curious to know what it possibly is, especially since it's only shown up on a couple leaves and the other plant with identical feedings/waterings/soil, hasn't shown any signs of this.
Here are some details that might help:
In week 5.5 of flower. It was only vegged for 6 weeks from seed (~4 weeks actual veg).
-Fox Farms Ocean Forrest (perlite/dolomite amended)
-Fox Farms Trio Nutrients (Grow Big, Tiger Bloom, Big Bloom)
-Blue Planet CalMag (2-0-0)
-Grandma's Unsulfered Molasses
-2000w QB
-Lights on temps: 76f - 79f
-Lights off temps: 67f - 71f
-RH: 45% - 53%
I feed these plants 3 times in a row, and then the 4th watering is an increased amount of just ph'd water just to be preventative and flush out any salt build up. Rinse and repeat. For some context on the 4th watering; typically I give the plants 4000ml @ ~1000ppm each for feedings, and then the plain watering is 6000ml @ 6.5ph per plant.
My average water in ph is 6.53ph (per my spreadsheet), and I usually swing between ~6.4ph and ~6.6ph across the waterings to give the roots some exposure to different ph levels (as I hope).
Currently I am on the plain water portion of this cycle, and have just finished the 3rd feeding in a row about 4 days ago. This is what I fed this plant (and the other) for the last 3 feedings:
-Grow Big @ 2ml
-Big Bloom @ 15ml
-Tiger Bloom @ 9ml
-CalMag @ 4ml
-Molasses @ 12ml
Total PPM: 1000ppm - 1040ppm
Water Temp: 70f - 72f
Feed ph (3 feedings): 6.43ph -> 6.48ph -> 6.58ph
I used to obsessively check run-off PPM and ph, but with this run, I couldn't be bothered honestly. The plants respond well to the incoming nutrients, and have generally had a problem free existence. With the dolomite buffer amended in the soil, I try not to worry about the soil ph too much. Maybe a false sense of security?
I decided to experiment with keeping some nitrogen lingering around to help keep the plant from yellowing so early like my last run. I cut it out way to early last go and as result, the plants were light green -> yellow from week 3 of flower and on. So far, that issue hasn't carried over for me, but I digress.
I feed CalMag at every feeding. The QB creates a situation where the plants demand it in higher quantities I think, and it was one of my learning points on the last harvest. Which is sort of why I am posting about these brown spots. It kind of seems like a Cal/Mag deficiency, but with how much CalMag they are already getting, it doesn't seem like that would be the case (save for a ph unbalance in the soil). Furthermore, I think the brown spots would be more spread across the plant at this point, which is not the case either. These brown spots are localized on only a few leaves at this point and are not occurring on the other plant. I have a watering can with a long spout on it, and to my knowledge, I have never dropped/splashed nutrient water onto the plant.
I am not too worried about it seeing that I will be starting the flush here in a week or two, and sometimes I think it's impossible to expect a plant to be perfect, even if healthy. But I would like to learn from it, if it's something preventable in the future.
Here are some details that might help:
In week 5.5 of flower. It was only vegged for 6 weeks from seed (~4 weeks actual veg).
-Fox Farms Ocean Forrest (perlite/dolomite amended)
-Fox Farms Trio Nutrients (Grow Big, Tiger Bloom, Big Bloom)
-Blue Planet CalMag (2-0-0)
-Grandma's Unsulfered Molasses
-2000w QB
-Lights on temps: 76f - 79f
-Lights off temps: 67f - 71f
-RH: 45% - 53%
I feed these plants 3 times in a row, and then the 4th watering is an increased amount of just ph'd water just to be preventative and flush out any salt build up. Rinse and repeat. For some context on the 4th watering; typically I give the plants 4000ml @ ~1000ppm each for feedings, and then the plain watering is 6000ml @ 6.5ph per plant.
My average water in ph is 6.53ph (per my spreadsheet), and I usually swing between ~6.4ph and ~6.6ph across the waterings to give the roots some exposure to different ph levels (as I hope).
Currently I am on the plain water portion of this cycle, and have just finished the 3rd feeding in a row about 4 days ago. This is what I fed this plant (and the other) for the last 3 feedings:
-Grow Big @ 2ml
-Big Bloom @ 15ml
-Tiger Bloom @ 9ml
-CalMag @ 4ml
-Molasses @ 12ml
Total PPM: 1000ppm - 1040ppm
Water Temp: 70f - 72f
Feed ph (3 feedings): 6.43ph -> 6.48ph -> 6.58ph
I used to obsessively check run-off PPM and ph, but with this run, I couldn't be bothered honestly. The plants respond well to the incoming nutrients, and have generally had a problem free existence. With the dolomite buffer amended in the soil, I try not to worry about the soil ph too much. Maybe a false sense of security?
I decided to experiment with keeping some nitrogen lingering around to help keep the plant from yellowing so early like my last run. I cut it out way to early last go and as result, the plants were light green -> yellow from week 3 of flower and on. So far, that issue hasn't carried over for me, but I digress.
I feed CalMag at every feeding. The QB creates a situation where the plants demand it in higher quantities I think, and it was one of my learning points on the last harvest. Which is sort of why I am posting about these brown spots. It kind of seems like a Cal/Mag deficiency, but with how much CalMag they are already getting, it doesn't seem like that would be the case (save for a ph unbalance in the soil). Furthermore, I think the brown spots would be more spread across the plant at this point, which is not the case either. These brown spots are localized on only a few leaves at this point and are not occurring on the other plant. I have a watering can with a long spout on it, and to my knowledge, I have never dropped/splashed nutrient water onto the plant.
I am not too worried about it seeing that I will be starting the flush here in a week or two, and sometimes I think it's impossible to expect a plant to be perfect, even if healthy. But I would like to learn from it, if it's something preventable in the future.
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