Nute burn or Deficiency. Day 63 Flowering

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AlChemist333

Active Member
I’m using Gaia Green slow release nutrients 4-4-4 and 2-8-4. Used the 2-8-4 for flowering with a small amount of 4-4-4. It’s been about over 5 weeks Since the last feed and I’m wondering if the soil has been depleted of P and K. Gaia Green takes about 5 weeks before you need to feed again. And i don’t want to give them anymore slow release nutes. Also this is my first grow. I’m using FFHF soil amended with worm castings, perlite. I’m not sure if I’m experiencing nute burn or deficiency and being that I’m using slow release nutes, I’m afraid to top dress with more this late in flower. Any suggestions on what’s going on and what I should do? Temperature ranges from 70/78F Night/Day and RH ranges from 57%/50% Night/Day. I noticed a little browning, possibly from Nitrogen tox a few weeks ago and start just giving them plain ph’d RO water. But I’m wondering if now they’re experiencing a deficiency. Some fan leaves have little brown spots. Some look like potassium deficiency and others look like Phosphorus deficiency but again I’m not sure. And this is the end of week 9 of flowering for me and the trichs are still clear. Not sure what’s taking them so long to turn cloudy.
 

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Redskare87

Redskare87

Well-Known Member
Just by looking at the pics, over abundance of N(dark green foliage, burned tips/edges), lack of P(purple stems, possibly brown edges). if I were to guess, possibly not enough light and or RO water causing ph fluctuations making P less available. What light is she under? Do you use straight RO water? do you add PH adjusters to RO every watering?
 
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93OG

Well-Known Member
Nute burn for sure. Dark shiny clawed leaves are a sign of nitrogen toxicity. The red stems can be caused by a k toxicity too. It’s a build up of secondary metabolites caused by a slowdown of growth. I would flush with RO water and not feed for at least a week. Don’t worry about starving them for that time. They have a week or two worth of food absorbed already.
 
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AlChemist333

Active Member
93OG said:
Nute burn for sure. Dark shiny clawed leaves are a sign of nitrogen toxicity. The red stems can be caused by a k toxicity too. It’s a build up of secondary metabolites caused by a slowdown of growth. I would flush with RO water and not feed for at least a week. Don’t worry about starving them for that time. They have a week or two worth of food absorbed already.
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I’ve been giving them just ph’d RO water since Week 6. I’m now at the beginning of week 10 and the nute burn hasn’t stopped.
 
A

AlChemist333

Active Member
Redskare87 said:
Just by looking at the pics, over abundance of N(dark green foliage, burned tips/edges), lack of P(purple stems, possibly brown edges). if I were to guess, possibly not enough light and or RO water causing ph fluctuations making P less available. What light is she under? Do you use straight RO water? do you add PH adjusters to RO every watering?
Click to expand...
I’ve been giving them ph’d RO water since week 6 because I noticed the nitrogen toxicity. It’s now the beginning of week 10 of flower for me. But the leaves seem to start showing signs of deficiency rather than burn. And I have a 1500W LED and a 600W LED in my 4x4 tent. And I pH’d to 6.5 every time I water them. I use pH Up and Down to adjust pH
 
A

AlChemist333

Active Member
93OG said:
Nute burn for sure. Dark shiny clawed leaves are a sign of nitrogen toxicity. The red stems can be caused by a k toxicity too. It’s a build up of secondary metabolites caused by a slowdown of growth. I would flush with RO water and not feed for at least a week. Don’t worry about starving them for that time. They have a week or two worth of food absorbed already.
Click to expand...
But would it be smart to flush being that I have amended soil and using organic nutes. Im
Using slow release nutes rather than bottled nutes. I was told to just keep giving the plants pH’d RO water for a while until the toxicity goes away but it’s been about 4 weeks now and being that it’s my first grow, I don’t want to lose my harvest.
 
myke

myke

Well-Known Member
AlChemist333 said:
I’ve been giving them just ph’d RO water since Week 6. I’m now at the beginning of week 10 and the nute burn hasn’t stopped.
Click to expand...
Nothing you can do now,Next time you can try feeding once a week at 1/4 dose.Thers a thread in organic section talking about this,gaia green something lol.
 
Redskare87

Redskare87

Well-Known Member
93OG said:
Nute burn for sure. Dark shiny clawed leaves are a sign of nitrogen toxicity. The red stems can be caused by a k toxicity too. It’s a build up of secondary metabolites caused by a slowdown of growth. I would flush with RO water and not feed for at least a week. Don’t worry about starving them for that time. They have a week or two worth of food absorbed already.
Click to expand...
AlChemist333 said:
I’ve been giving them ph’d RO water since week 6 because I noticed the nitrogen toxicity. It’s now the beginning of week 10 of flower for me. But the leaves seem to start showing signs of deficiency rather than burn. And I have a 1500W LED and a 600W LED in my 4x4 tent. And I pH’d to 6.5 every time I water them. I use pH Up and Down to adjust pH
Click to expand...
93OG said:
Nute burn for sure. Dark shiny clawed leaves are a sign of nitrogen toxicity. The red stems can be caused by a k toxicity too. It’s a build up of secondary metabolites caused by a slowdown of growth. I would flush with RO water and not feed for at least a week. Don’t worry about starving them for that time. They have a week or two worth of food absorbed already.
Click to expand...
Since too much K can cause purple stems, which I didn’t know, thanks @93OG, you’re definitely looking at a burn situation and should follow @93OG ’s instructions. you could probably remove some of the ghaia kernels you top dressed also.
 
A

AlChemist333

Active Member
Redskare87 said:
Since too much K can cause purple stems, which I didn’t know, thanks @93OG, you’re definitely looking at a burn situation and should follow @93OG ’s instructions. you could probably remove some of the ghaia kernels you top dressed also.
Click to expand...
So are you suggesting that I flush the amended soil I have?? Then starve them for a little then feed them again with slow release nutes at Week 10 of flower? They’re close to being finished. I’m more worried about destroying the eco system of my soil. Or am
I just over thinking?
 
myke

myke

Well-Known Member
AlChemist333 said:
So are you suggesting that I flush the amended soil I have?? Then starve them for a little then feed them again with slow release nutes at Week 10 of flower? They’re close to being finished. I’m more worried about destroying the eco system of my soil. Or am
I just over thinking?
Click to expand...
Dont flush your good soil! Its alive and ready for the next run.Maybe it needs nothing but water next run.
 
9

93OG

Well-Known Member
I’m not a living soil guy but I’ve zapped plenty of plants over the years. Don’t see why ruining a bunch of water through the soil would wreck it. Like I said, not a living soul guy, I could be way off
 
A

AlChemist333

Active Member
JMystery said:
This is exactly what I got about 4 weeks before harvest. Sorry I don't have the answer for you but interested to see what people say.
Click to expand...
So today I said fuck it and decided to flush my plants. After the first flush, I checked the PPM and pH of the runoff. The PPM of the run off was 3200 and the pH was 5.4. Not sure why my soil pH is so acidic, I pH to 6.5 every watering. I’ve notice that when I use molasses and water and I don’t use all of it and want to use the remaining volume for another watering, I’ll check the pH and the pH would be more acidic than when I pH’d it for the previous watering. Other than that I can’t think of anything that would I made my soil so acidic. After flushing with just plain water the pH rose to 6.3-6.4 ish. I’m going to let them sit for a few days and see how they do but with it being this late and flowering I might just reframe from adding more nutes. But I do need to determine what cause more soil pH to become so acidic.
 
A

AlChemist333

Active Member
93OG said:
I’m not a living soil guy but I’ve zapped plenty of plants over the years. Don’t see why ruining a bunch of water through the soil would wreck it. Like I said, not a living soul guy, I could be way off
Click to expand...
So today I said fuck it and decided to flush my plants. After the first flush, I checked the PPM and pH of the runoff. The PPM of the run off was 3200 and the pH was 5.4. Not sure why my soil pH is so acidic, I pH to 6.5 every watering. I’ve notice that when I use molasses and water and I don’t use all of it and want to use the remaining volume for another watering, I’ll check the pH and the pH would be more acidic than when I pH’d it for the previous watering. Other than that I can’t think of anything that would I made my soil so acidic. After flushing with just plain water the pH rose to 6.3-6.4 ish. I’m going to let them sit for a few days and see how they do but with it being this late and flowering I might just reframe from adding more nutes. But I do need to determine what cause more soil pH to become so acidic.
 
A

AlChemist333

Active Member
93OG said:
Nute burn for sure. Dark shiny clawed leaves are a sign of nitrogen toxicity. The red stems can be caused by a k toxicity too. It’s a build up of secondary metabolites caused by a slowdown of growth. I would flush with RO water and not feed for at least a week. Don’t worry about starving them for that time. They have a week or two worth of food absorbed already.
Click to expand...
So today I said fuck it and decided to flush my plants. After the first flush, I checked the PPM and pH of the runoff. The PPM of the run off was 3200 and the pH was 5.4. Not sure why my soil pH is so acidic, I pH to 6.5 every watering. I’ve notice that when I use molasses and water and I don’t use all of it and want to use the remaining volume for another watering, I’ll check the pH and the pH would be more acidic than when I pH’d it for the previous watering. Other than that I can’t think of anything that would I made my soil so acidic. After flushing with just plain water the pH rose to 6.3-6.4 ish. I’m going to let them sit for a few days and see how they do but with it being this late and flowering I might just reframe from adding more nutes. But I do need to determine what cause more soil pH to become so acidic.
 
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