BigBlonde
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Thanks. This helps us rule out the lights. We'll test pH soon. I suspect it's too high. This is a problem I wasn't expecting to have. We have grown in pots outdoors with about the same soil and had good results. So it's time to read more about immobile nutrient deficiency.The yellowing you see is an immobile nutrient deficiency symptom. This is often caused by pH being too high or too low. Some people use pH indicators for soil pH, others use pH meters or pens.
You are watering way too often and you should find more suitable fertilizers.
Without knowing anything about the pH of your soil and water, the only thing you can do is buy some suitable soil and transplant this plant into it, shaking off as much of the MG soil as possible, without hurting the plant. Then water thoroughly and only water again when the pot feels light, like it did before it was ever watered.
At first, we thought the plant was getting too much light because some of the leaves were dark green to brown and curling downward, so we reduced the light level and increased watering. That initial problem went away and was replaced by this yellowing problem. Using a light level phone app, I measured 13,000 lux at the top of the plant. I don't know what a good light level would be, though. So maybe we can't rule out a problem with the lights. This is our first time growing with lights, so we expected this would be a learning experience.could be light stress
hard to tell but in first picture the yellowing seems to be starting in all the leafs affected in between the veins? and not starting to yellow closer to the stem of the leaf..
plus the white tips..
light stress is part of it if not the cause of it..
So, how much more are you watering? Are you now possibly over watering?At first, we thought the plant was getting too much light because some of the leaves were dark green to brown and curling downward, so we reduced the light level and increased watering. That initial problem went away and was replaced by this yellowing problem. Using a light level phone app, I measured 13,000 lux at the top of the plant. I don't know what a good light level would be, though. So maybe we can't rule out a problem with the lights. This is our first time growing with lights, so we expected this would be a learning experience.
Now I'm wondering if the problem was the soil we used or possibly the pH of the water. We ordered a colormetric pH test kit and it should be here in a few days. That will help us know the pH of the water. I need to learn how to test the soil pH.
The distance between nodes is shortest I've ever seen on a plant. I usually think that the distance is determined by the amount of light, with short distances indicating ample light. Now I'm learning that the short distance can also be due to nutrient deficiency. These plants seem to be growing slowly, as well, possibly indicating a nutrient or pH problem.
750 DLI? You sure about that.It's definitely light stress. The lower plant is getting a lower dli, hence less yellowing for now. It's so crazy how powerful these lights are. My grand daddy purple couldn't go above 750 dli even in flower without stressing. I've found that indicas tolerate less light strength then sativas. My Maui wowie, I was able to go to 1000 easily. Lower your light intensity and they should start looking way better and even grow faster.
Yeah, unfortunately. Everytime I'd try, it would start bleaching the plant.750 DLI? You sure about that.
I’m thinking you meant ppfd. 750 DLI is like being on the sun, lol.Yeah, unfortunately. Everytime I'd try, it would start bleaching the plant.
Yeah, lol, that is correct. I will leave my error for all to see the potency of my grand daddy purple.I’m thinking you meant ppfd. 750 DLI is like being on the sun, lol.
Lol, I use a nuclear reactor to grow my plants.I’m thinking you meant ppfd. 750 DLI is like being on the sun, lol.
This.Your watering to often which results in poor gas exchange and creates uptake issues. That in turn leads to not enough nutrients to support the photosynthetic demands of the plant and that equals light stress.
Back the light off as far as possible for a few days.
Allow for a longer dry back period. Water to saturate the soil with some run off. Then do NOT water again until the pots are light… they will be noticeably lighter and if you question if they are ready then they are not.
Read this on watering and see how fast they recover from underwatering in the clone video ill link so you can see how easy they recover. Over watering is caused by watering to often not to much
Marijuana Watering, how media, pot size/shape and environment affect it
Ok lots of posts on how to water plants. So I thought I would put together a thread on how different factors contribute to different results that ppl see. This will be a long read based on my personal knowledge, opinions, research and others work to consolidate information for our members. I'm...www.thcfarmer.com
Video of clone recovering from underwatering
Ok in one thread I posted I was going to do a video of how fast plants recover from underwatering. In hopes that new growers see how easy it is for a plant to recover from underwatering when compared to over watering. I have some toss away clones sitting about and wanted to show how fast they...www.thcfarmer.com
I read your post about watering and watched the video. They were both very helpful. Thanks so much. I can tell you've put a lot of thought into it. You might like this document that I found "CONTAINER SOILS ARE DIFFERENT" that also discusses the perched water table and container gardening. It pretty much says the same as what you wrote. In my other gardening, I have used methods like hugelkultur and bottom watering with success. I have some pots that have gauges that tell how much water is in the reservoir at the bottom of the pot. My Fuscias and Nasturtiums really like those pots and the gauges really help.Your watering to often which results in poor gas exchange and creates uptake issues. That in turn leads to not enough nutrients to support the photosynthetic demands of the plant and that equals light stress.
Back the light off as far as possible for a few days.
Allow for a longer dry back period. Water to saturate the soil with some run off. Then do NOT water again until the pots are light… they will be noticeably lighter and if you question if they are ready then they are not.
Read this on watering and see how fast they recover from underwatering in the clone video ill link so you can see how easy they recover. Over watering is caused by watering to often not to much
Hell yesI have been taking pictures of my over-watered plant at the same time every day. Here is a four-day sequence that show a dramatic change in color.
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Measure some if the runoff to see what the ph in the soil is. Imo you dont need to ph water. If tou jeed to lower soil ph aomething like aluminum sulfate is a good option but you should test the soil ph before doing so.The plants started wilting yesterday, which was day five of no watering. We gave both plants about a half gallon of water. They responded quickly, just as Aqua Man said they would. Today the plants look good, but there's still some yellowing. A day after the first watering, they look about the same as they did the last day without water--so no observable change. Now that we have a better understanding of how to water, we can move on to the next learning opportunity.
We finally received our pH test kit. Our water tested at about 7.5 using a colormetric test. A friendly neighbor had the same result. I suspected our water was slightly alkaline. So we'll need to lower the pH. We need something that's best for a few plants growing in soil. At this point, I'm only focusing on adjusting the input water, as it is the next obvious problem. I've been reading about lowering pH, it seems a product like "General Hydroponics PH Down" would be best for my purposes. The product description indicates it can be used to condition water for soil growing.
In other news, we ordered a second 120 Watt light for our 4x4 tent. It should arrive in a few days and we'll before we get to the flowering stage. We're really starting to think ahead to flowering. Before we get there, however, I'm wondering about how to add a second light without stressing the plants and may post about it.
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