Yellowing of leaves - confused !

Cunning stunt

Cunning stunt

Member
Hi you lot - I'm currently growing 1 critical kush under a 250 watt hps and I'm having problems with it - If any one could tell me what the problem is I would be so thankful!
I'm growing in bio bizz all mix at 10 days into flower. Using green house seed powder feeding hybrid at 1 gram a litre - I feed then water then feed.
 

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Diabolical666

Diabolical666

Well-Known Member
I was reading up on the reviews of your nutes. More negative responses then positive...does it tell you on the product what ph it prefers?
 
Cunning stunt

Cunning stunt

Member
Diabolical666 said:
I was reading up on the reviews of your nutes. More negative responses then positive...does it tell you on the product what ph it prefers?
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No it's doesn't say a ph - all it says is to use a gram per litre - another thing to state is that I was reading the packaging on the green house seed co hybrid feed and it says - magnesium 0.05 could this be the problem at what we are seeing in the pictures of my plant is a calmag deficiency ? Also to add - This is the first time I've ever used this feed and normally use advanced nutrients - I thought I would give this a go but I'm having a Terrible time
 
Diabolical666

Diabolical666

Well-Known Member
Man I hear ya, its takes awhile to dial in a nute line...
Cal mag def doesnt start at the tops. Yellowing from the middle and top is an N deficiency. Now when N or cal or Mag are not available those lock each other out like a domino effect. So when you have 1 of the 3 defiencies you need to give it a specific small dose of all 3 for a faster recover time.
 
roorsmoker

roorsmoker

Well-Known Member
Put your face up to the canopy to check if the light is too close. The hand test never works for me because I have very little feeling on either side of my hands. Although a temperature probe at canopy level is much more accurate.

Looks like too many nutes causing a sulphur lockout. Your new growth is losing its cuticle, or protective waxy coating the plant uses for defense against pests, diseases, and temperature. This could be why they look a little heat stressed, despite the light being so far away. Flush and resume feeding at 1/4 to 1/2 strength while adding 100-200 ppm cal mag when resuming feed schedule.
 
Cunning stunt

Cunning stunt

Member
Diabolical666 said:
Man I hear ya, its takes awhile to dial in a nute line...
Cal mag def doesnt start at the tops. Yellowing from the middle and top is an N deficiency. Now when N or cal or Mag are not available those lock each other out like a domino effect. So when you have 1 of the 3 defiencies you need to give it a specific small dose of all 3 for a faster recover time.
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Ok man, so what do you think I should do ? Give it a higher nitrogen feed and use cal mag as a foliage spray ? The growth seems fast still - it's growing as fast as normal but the leafs are just starting to do this and it want to combat the problem before it gets any worse - what do you think I should do man ? P.s thanks for your help!
 
roorsmoker

roorsmoker

Well-Known Member
Cunning stunt said:
Ok man, so what do you think I should do ? Give it a higher nitrogen feed and use cal mag as a foliage spray ? The growth seems fast still - it's growing as fast as normal but the leafs are just starting to do this and it want to combat the problem before it gets any worse - what do you think I should do man ? P.s thanks for your help!
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Flush dude. Sulphur is usually always available. Your bottom leaves are dark green, your tops are yellow. Classic nute burn locking out sulphur. Flush then resume feeding 1/4 to 1/2, do NOT increase N. I don't think it needs a foliage spray.
 
Cunning stunt

Cunning stunt

Member
roorsmoker said:
Put your face up to the canopy to check if the light is too close. The hand test never works for me because I have very little feeling on either side of my hands. Although a temperature probe at canopy level is much more accurate.

Looks like too many nutes causing a sulphur lockout. Your new growth is losing its cuticle, or protective waxy coating the plant uses for defense against pests, diseases, and temperature. This could be why they look a little heat stressed, despite the light being so far away. Flush and resume feeding at 1/4 to 1/2 strength while adding 100-200 ppm cal mag when resuming feed schedule.
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Hi man - thanks for the reply.
What you have said is very true - my under growth still has the waxy looking coating and a nice shine on the leaves yet the higher growth doesn't - my temp at canopy level is 25c and does rise up to 28c - I will flush and readjust feeding - I feel that the bio bizz all mix is a hot soil an I've added nutrients so I guess this is my own fault!
 
Daggy

Daggy

Well-Known Member
Look at your cal mag. Im pretty sure it has a good amount of Nitrogen in it. To me Cal mag is is the plants vigor.
I did some research and alot of people have cal-mag issues with bio bizz . Check out these links

https://www.rollitup.org/t/cal-mag-def-with-biobizz-range.825330/

http://www.thctalk.com/cannabis-forum/showthread.php?80659-Why-do-BioBizz-Nutes-Soils-Always-Show-MG-Def

http://forum.grasscity.com/absolute-beginners/1341720-information-regarding-biobizz-nutrients-cal-mag.html

^ All links to people discussing cal mag issues with bio bizz.

If your PH is too low no matter how much cal mag u put in the plant will not drink it. It will lock it out thats why I ask about your PH.

I would add 2-3 mls per gallon for 1 feed. If it was cal mag they will bounce back quickly.

Hope this helps
 
roorsmoker

roorsmoker

Well-Known Member
Daggy said:
Look at your cal mag. Im pretty sure it has a good amount of Nitrogen in it. To me Cal mag is is the plants vigor.
I did some research and alot of people have cal-mag issues with bio bizz . Check out these links

https://www.rollitup.org/t/cal-mag-def-with-biobizz-range.825330/

http://www.thctalk.com/cannabis-forum/showthread.php?80659-Why-do-BioBizz-Nutes-Soils-Always-Show-MG-Def

http://forum.grasscity.com/absolute-beginners/1341720-information-regarding-biobizz-nutrients-cal-mag.html

^ All links to people discussing cal mag issues with bio bizz.

If your PH is too low no matter how much cal mag u put in the plant will not drink it. It will lock it out thats why I ask about your PH.

I would add 2-3 mls per gallon for 1 feed. If it was cal mag they will bounce back quickly.

Hope this helps
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This is all correct. However, you should begin adding cal mg with a lighter dose nutrient regiment in about 3-7 days after you flush. It takes five days or so to see any major changes, so whatever you do, write it down and don't make any crazy changes.
 
Cunning stunt

Cunning stunt

Member
Daggy said:
Look at your cal mag. Im pretty sure it has a good amount of Nitrogen in it. To me Cal mag is is the plants vigor.
I did some research and alot of people have cal-mag issues with bio bizz . Check out these links

https://www.rollitup.org/t/cal-mag-def-with-biobizz-range.825330/

http://www.thctalk.com/cannabis-forum/showthread.php?80659-Why-do-BioBizz-Nutes-Soils-Always-Show-MG-Def

http://forum.grasscity.com/absolute-beginners/1341720-information-regarding-biobizz-nutrients-cal-mag.html

^ All links to people discussing cal mag issues with bio bizz.

If your PH is too low no matter how much cal mag u put in the plant will not drink it. It will lock it out thats why I ask about your PH.

I would add 2-3 mls per gallon for 1 feed. If it was cal mag they will bounce back quickly.

Hope this helps
Click to expand...
There interesting links !
One grower states about United Kingdom water supply and the fact they get cal mag deficiency - using bio bizz range ! This is also true for me as I from the uk and this is the first time using this soil range - I have never had this deficiency until this grow - I have no way of comparing it either as I am only growing one at the moment due to moving house soon ! So what do you guys recon I do ? Just give her a good flush then lower my feeding schedule dosage and add calmag into my feed or just start use calmag. Also will flushing effect my plants yield as Ive started flower 10 days ago. Thanks you'z lot !!!!
 
roorsmoker

roorsmoker

Well-Known Member
All growers flush, it's pretty much required every 30 days tops, especially when not using 100% organic nutes. I think as long as you have good enough draining soil, a flush should only help your yields. As long as you don't drown it, flushes are a healthy, natural part of the growing process.

And you are welcome. I've never ran more than half strength of whatever the instructions say for bloom fertilizers. They want you to use excess so you buy more.
 
Botonist

Botonist

Well-Known Member
Sometimes day/night temps being off can cause this too, if your night temp is same or higher than day, it will cause this, seems weird but if you run your AC only with lights on, this can happen..
 
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