yellowing during flowering

giz2k14 · May 4, 2015

Hey my critical kush plant will be 5 weeks into 12/12 tomorrow.she looked great up until a few days ago problem is she's started to yellow all over, the breeder states a 8 week flower but I know it's normally longer.looking on other people's grows they take.about 9 weeks so say I have 4 weeks left.i think it's nitrogen deficiency ph and everything else is fine.shes getting fed 6ml biobizz bloom and 2ml top max with 3ml grow per 2 litres of water total water given 6 litres,2 feeds back which is about 10 days ago she was getting only 1ml of grow per litre so I upped that to 2ml now to 3ml and drop back to 2ml now next feed just trying to see if the extra n will help her out does anyone agree that it's a nitrogen problem or is it something else ?

R1b3n4 · May 4, 2015

click to make picture bigger, but yeah Nitrogen, top left

Mad_Prophessor · May 4, 2015

It is normal for your plants to yellow towards the end of their lives. The plant is pulling the nitrogen from the leaves.

R1b3n4 · May 4, 2015

Mad_Prophessor said:
It is normal for your plants to yellow towards the end of their lives. The plant is pulling the nitrogen from the leaves.

His plants are only week 5 12/12, starving a plant about halfway thru flower isnt normal, keem em green til the end

Mad_Prophessor · May 4, 2015

R1b3n4 said:
His plants are only week 5 12/12, starving a plant about halfway thru flower isnt normal, keem em green til the end

I have had strains finish in 7 weeks as recently as last year. I dunno much about his strain.

R1b3n4 · May 4, 2015

8-9 week strain the critical kush

Mad_Prophessor · May 4, 2015

R1b3n4 said:
8-9 week strain the critical kush

I can read.

What the strain does and what the breeder says it will do are not the same thing.

R1b3n4 · May 4, 2015

Mad_Prophessor said:
I can read. What the strain does and what the breeder says it will do are not the same thing.

Either way starving it at 5 weeks 12/12 isnt the answer.......

giz2k14 · May 5, 2015

R1b3n4 said:
Either way starving it at 5 weeks 12/12 isnt the answer.......

do I have a problem ? Like I said I have upped the dosage of nitrogen but won't see instant results as the feed is organic so from what I know it had to be broken down first ,and I didn't think I was starving her any advice on what to do

R1b3n4 · May 5, 2015

giz2k14 said:
do I have a problem ? Like I said I have upped the dosage of nitrogen but won't see instant results as the feed is organic so from what I know it had to be broken down first ,and I didn't think I was starving her any advice on what to do

Having had a look back through your original post i see you are using 6ml/L of biobizz bloom and 3ml/L of grow, this is more than likely your problem, completely out of whack against what their feed chart reccommends, ive included the feed chart below for you,

giz2k14 · May 5, 2015

R1b3n4 said:
Having had a look back through your original post i see you are using 6ml/L of biobizz bloom and 3ml/L of grow, this is more than likely your problem, completely out of whack against what their feed chart reccommends, ive included the feed chart below for you,

No that's wrong 6ml bloom per 2litre of water and 3ml of grow only upped the grow once from 2ml per 2litre to see if would help yellowing.so I used last feed 1.5ml of grow per litre just 0.5 higher than what they reccommend because of yellow leaves and 3ml bloom per litre which is what it is on their chart if you count 5 weeks from their 12/12 I'm on week 7 on the chart

giz2k14 · May 5, 2015

Mad_Prophessor said:
I have had strains finish in 7 weeks as recently as last year. I dunno much about his strain.

Do you think it's a problem mate

R1b3n4 · May 5, 2015

giz2k14 said:
No that's wrong 6ml bloom per 2litre of water and 3ml of grow only upped the grow once from 2ml per 2litre to see if would help yellowing.so I used last feed 1.5ml of grow per litre just 0.5 higher than what they reccommend because of yellow leaves and 3ml bloom per litre which is what it is on their chart if you count 5 weeks from their 12/12 I'm on week 7 on the chart

Well according to their feed chart they should be on ...
4ml/L biobizz grow
3ml/L biobizz bloom
1ml/L top max

You are giving them
1-1.5ml grow
3ml bloom
2ml topmax

so both your biobizz grow needs upping to 4ml/L and your topmax needs dropping to 1ml/L

giz2k14 · May 5, 2015

R1b3n4 said:
Well according to their feed chart they should be on ...
4ml/L biobizz grow
3ml/L biobizz bloom
1ml/L top max

You are giving them
1-1.5ml grow
3ml bloom
2ml topmax

so both your biobizz grow needs upping to 4ml/L and your topmax needs dropping to 1ml/L

Sorry mate to correct you again if you check the chart again there's one for light mix and one for all mix sorry for not stating that I am using all mix

giz2k14 · May 5, 2015

giz2k14 said:
Sorry mate to correct you again if you check the chart again there's one for light mix and one for all mix sorry for not stating that I am using all mix

I am using topmax at 1ml per litre mate in the op it says 2ml per 2litre of water so it's 1ml per litre

Dr. Who · May 5, 2015

Asking this question again?

I see the pictures are new and the yellowing is progressing .....

I say it's too much P....classic showing of this problem in your pics!!!

High P bloom foods do this to plants all the time...While I was not sure about it the first time you asked as the listed NPK ratio's weren't to bad for the product. I did not take into account how early they had you start them and how they increased in strength as time went on.....

So then......P tox!

At 5+ weeks in flower,,,,,they will never go back to "green".....They can't,,,,ever. The only rime a plant will "recover" the green look is if it is low on N and you add more.
That is NOT your problem and no amount of added N will "fix" it. In fact adding N will only cause other problems....

You can cut back on the bloom feed by about 50% and run it out......OR,,,,,simply continue as directed and realize that while the plant is yellowing, it's what the maker wanted you to do as they think that adding stupid amounts of P in flower will give you bigger better buds.....

I'd be using less bloom and run it out If I were you.....
By the way, do you feed every watering?
Try only every other! You'll do better with synthetic's that way.

Doc

giz2k14 · May 5, 2015

Dr. Who said:
Asking this question again?

I see the pictures are new and the yellowing is progressing .....

I say it's too much P....classic showing of this problem in your pics!!!

High P bloom foods do this to plants all the time...While I was not sure about it the first time you asked as the listed NPK ratio's weren't to bad for the product. I did not take into account how early they had you start them and how they increased in strength as time went on.....

So then......P tox!

At 5+ weeks in flower,,,,,they will never go back to "green".....They can't,,,,ever. The only rime a plant will "recover" the green look is if it is low on N and you add more.
That is NOT your problem and no amount of added N will "fix" it. In fact adding N will only cause other problems....

You can cut back on the bloom feed by about 50% and run it out......OR,,,,,simply continue as directed and realize that while the plant is yellowing, it's what the maker wanted you to do as they think that adding stupid amounts of P in flower will give you bigger better buds.....

I'd be using less bloom and run it out If I were you.....
By the way, do you feed every watering?
Try only every other! You'll do better with synthetic's that way.

Doc

To much P as is phosphorus I can't find any thing online to back up a p tox mate, that's why I asked again to much P causes zinc iron or potassium problems to show on leaves and I'm not getting any of that just yellowing ?

giz2k14 · May 5, 2015

Dr. Who said:
Asking this question again?

I see the pictures are new and the yellowing is progressing .....

I say it's too much P....classic showing of this problem in your pics!!!

High P bloom foods do this to plants all the time...While I was not sure about it the first time you asked as the listed NPK ratio's weren't to bad for the product. I did not take into account how early they had you start them and how they increased in strength as time went on.....

So then......P tox!

At 5+ weeks in flower,,,,,they will never go back to "green".....They can't,,,,ever. The only rime a plant will "recover" the green look is if it is low on N and you add more.
That is NOT your problem and no amount of added N will "fix" it. In fact adding N will only cause other problems....

You can cut back on the bloom feed by about 50% and run it out......OR,,,,,simply continue as directed and realize that while the plant is yellowing, it's what the maker wanted you to do as they think that adding stupid amounts of P in flower will give you bigger better buds.....

I'd be using less bloom and run it out If I were you.....
By the way, do you feed every watering?
Try only every other! You'll do better with synthetic's that way.

Doc

Do you have anything showing that a p tox causes leaf yellowing if so could you post it as I cannot find anything thanks it says this on every site I have been on
Toxicity Symptoms
Too much Phosphorus levels affect plant growth by suppressing the uptake of Iron, Potassium and Zinc, potentially causing deficiency symptoms of these nutrients to occur in plants too. A Zinc deficiency is most common under excessive phosphorus conditions, as well as causing other nutrients to have absorption troubles like coppe

Dr. Who · May 5, 2015

giz2k14 said:
To much P as is phosphorus I can't find any thing online to back up a p tox mate, that's why I asked again to much P causes zinc iron or potassium problems to show on leaves and I'm not getting any of that just yellowing ?

giz2k14 said:
Do you have anything showing that a p tox causes leaf yellowing if so could you post it as I cannot find anything thanks it says this on every site I have been on
Toxicity Symptoms
Too much Phosphorus levels affect plant growth by suppressing the uptake of Iron, Potassium and Zinc, potentially causing deficiency symptoms of these nutrients to occur in plants too. A Zinc deficiency is most common under excessive phosphorus conditions, as well as causing other nutrients to have absorption troubles like coppe

Look for Uncle Ben's post on Too much bloom foods.

Dude, I've been growing MJ for over 40 years. Put my first seed in soil at 15 and I'm 56 now.....Trust me,,,,I'm right....Too much P and yeah, it does begin to effect other nutrients as the problem gets worse....keep giving it that high P and it will get there too.

Your plant is not to bad right now....it will finish. It would finish if you continue on as directed. But it would progress to worse on a bell curve.

I don't care what any synthetic maker of plant nutrition says about how often to feed.....With synthetic's, in soil, it's every other watering - NOT everyone!
I think that is exactly what your problem is.....as far as how you got too much P..

giz2k14 · May 5, 2015

Dr. Who said:
Look for Uncle Ben's post on Too much bloom foods.

Dude, I've been growing MJ for over 40 years. Put my first seed in soil at 15 and I'm 56 now.....Trust me,,,,I'm right....Too much P and yeah, it does begin to effect other nutrients as the problem gets worse....keep giving it that high P and it will get there too.

Your plant is not to bad right now....it will finish. It would finish if you continue on as directed. But it would progress to worse on a bell curve.

I don't care what any synthetic maker of plant nutrition says about how often to feed.....With synthetic's, in soil, it's every other watering - NOT everyone!
I think that is exactly what your problem is.....as far as how you got too much P..

Im not doubting your experience mate just couldn't find anything on to much P causes yellowing.
I only give her a new dose of nitrogen few days ago as it's organic it won't be taken up straight away as it has to be broken down first to be made ready for the plant to uptake.im going give her 5 days until next feed and if she hasn't stopped yellowing or gone worse I will follow your help full post.but as you stated theres one post to back up what you say as I cannot find anything related to what your saying I'm not going to jump straight into what you said to do but if it does progress obviously you are correct and I will apologise for doubting you

yellowing during flowering

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