First grow, yellowing around buds.

Afrikaner

Afrikaner

Member
Hi,

I'm not sure if it's an issue or not. After around 4 weeks of flowering (12/12) the leaves around the buds are quite yellow. Unknown strain. Temperature was around 20C for the month and humidity below 50%.
Any ideas would be appreciated, I can't pin down a specific issue, if there is any.

20160702_131232.jpg 20160702_131238(1).jpg 20160702_131225.jpg
 
ganga gurl420

ganga gurl420

Well-Known Member
The yellowing part can be normal, it's the drooping part that worries me. When the plant goes into flower it pulls nitrogen out of the leaves. The good thing is this will make for bigger buds. The wilting though leads me to believe maybe an over watering issue. But hard to tell with what little info was given
 
StoneyMcphatter

StoneyMcphatter

Well-Known Member
Afrikaner

Afrikaner

Member
bravedave said:
Medium?
Nutes? How much? How often? Adding any Mg?
Yellowing started at top? Or just made its way there?
Water schedule?
What do you think it is?
Click to expand...
Thanks bravedave.
The plant is growing in a diy aeroponics/deep water culture box.

Changing water and nutes weekly.
Nutes are a locally produced mixtures labelled Hydroponics Nutrient A, B and bloom booster. I'm currently adding about 10ml, 15ml and 5ml per 1 litre of water respectively.
The nutrients in these mixes are:
Nutrient A Contains per kg or added to 10l of water:
Nitrogen N 66g/kg
Phosphorus P 45g/kg
Potassium K 239g/kg
Magnesium Mg 45g/kg
Sulphur S 71g/kg
Trace Elements:
Iron Fe 1700 mg/kg
Manganese Mn 400mg/kg
Boron B 500mg/kg
Zinc Zn 200mg/kg
Molybdenum Mo 50mg/kg
Copper (Cu) 30mg/kg

Nutrient B Contains per kg or added to around 15l of water:
Nitrogen N 117g/kg
Calcium Ca 166g/kg

Bloom booster Contains, per kg or added to 40l of water:
Phosphorus P 227g/kg
Potassium K 286g/kg

The yellowing is only at the top. The tops of the plant is about 10cm away from a 3:1 mix of red:blue led rope lights with a total power consumption of around 270 watts. Diy led light.

The plant is most likely a sativa strain. Grown from bag seed.

Typing all this out I realise I need to lessen all the variables...
 
Afrikaner

Afrikaner

Member
So, if my maths are correct... In my 10L reservoir I currently have the following nutrients (excl. trace elements):
  • Nitrogen (N) at 0.183g
  • Phosphorus (P) at 0.073375g
  • Potassium (K) at 0.27475g
  • Magnesium (Mg) at 0.045g
  • Sulphur (S) at 0.071g
  • Calcium (Ca) at 0.166g
Is this too little/much?
Does anybody have a detailed feeding schedule?
 
bravedave

bravedave

Well-Known Member
Afrikaner said:
So, if my maths are correct... In my 10L reservoir I currently have the following nutrients (excl. trace elements):
  • Nitrogen (N) at 0.183g
  • Phosphorus (P) at 0.073375g
  • Potassium (K) at 0.27475g
  • Magnesium (Mg) at 0.045g
  • Sulphur (S) at 0.071g
  • Calcium (Ca) at 0.166g
Is this too little/much?
Does anybody have a detailed feeding schedule?
Click to expand...
Ha. That's more info. Your NPK numbers are a bit weird for bloom bit I grow in peat and am unsure if you hydro boys require something different. With the yellowing moving down, its not classic N deficiency (or lockout) but sure looks that way. Your mix certainly is more complicated than it could be. Last 2 grows I have gone 20/10/20 for pretty much the whole grow with good results. Hopefully someone with more hydro exp will chime in.
 
coreywebster

coreywebster

Well-Known Member
@churchhaze you would be better at analysing the OPs nutrient mix as far as if its missing anything or too high in one thing or another. Hope you don't mind me shouting you over.
Still think its possible light burn with the way its presenting itself, the curling under badly and yellowing, but with only 270w of led string there is likely much more to it. Clearly its not N def, its tops and bottoms look very dark which would not be the case. Thought about late stages of N tox but no sign of burnt tips even if the leaves are very dark lower down and clawing.
Anyway I'm speculating here, which isn't helpful, so input from you would be appreciated.
 
bravedave

bravedave

Well-Known Member
coreywebster said:
@churchhaze you would be better at analysing the OPs nutrient mix as far as if its missing anything or too high in one thing or another. Hope you don't mind me shouting you over.
Still think its possible light burn with the way its presenting itself, the curling under badly and yellowing, but with only 270w of led string there is likely much more to it. Clearly its not N def, its tops and bottoms look very dark which would not be the case. Thought about late stages of N tox but no sign of burnt tips even if the leaves are very dark lower down and clawing.
Anyway I'm speculating here, which isn't helpful, so input from you would be appreciated.
Click to expand...
I have experienced both bleaching and light burn due to heat. This looks like neither.
 
coreywebster

coreywebster

Well-Known Member
bravedave said:
I have experienced both bleaching and light burn due to heat. This looks like neither.
Click to expand...
BraveDave, just re read that, I was not implying he would be better than you at analysing the mix, I hope you did not think that, Better than me because its almost double dutch to me. Its just I have read a lot of his comments on other threads regarding mixing his own from salts. I have no knowledge of what you do or don't do. I apologise if it read like that, or I didn't think about how it would read!
 
coreywebster

coreywebster

Well-Known Member
yellow-top-leaves-from-grow-light-being-too-close.jpg This is light burn, which is what I am comparing it to. Granted its not my pic, from researching, the only time I have seen it in real life was once on the tops of my buds.
 
bravedave

bravedave

Well-Known Member
coreywebster said:
BraveDave, just re read that, I was not implying he would be better than you at analysing the mix, I hope you did not think that, Better than me because its almost double dutch to me. Its just I have read a lot of his comments on other threads regarding mixing his own from salts. I have no knowledge of what you do or don't do. I apologise if it read like that, or I didn't think about how it would read!
Click to expand...
No, I am behind your call out to Church. I find his numbers odd but I don't follow hydroponic grows. Just like your discounting N def. I just feel the plants show feeding on itself LIKE it lacked N, more than a result of any light burn.
 
coreywebster

coreywebster

Well-Known Member
I always thought with N been the most mobile stole from the low classes to give to the upper classes, sry, leaves, like a reverse robin hood.
 
C

churchhaze

Well-Known Member
Afrikaner said:
Nutes are a locally produced mixtures labelled Hydroponics Nutrient A, B and bloom booster. I'm currently adding about 10ml, 15ml and 5ml per 1 litre of water respectively.
Click to expand...
Aren't you supposed to use equal parts of A and B? Too much calcium nitrate will lock out magnesium and iron.

Try using the A+B in a 1:1 ratio and stop using the bloom booster.
 
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