Is this zinc deficiency?

P

Psychotic Psychonaut

Member
Okay, well I had posted some pics and a thread for another one of my plants a week or two back. I suspected it was heat stress from being too close to the bulb, but the best advice I was given was that it looked like early signs of nutrient burn. That turned out to be incorrect, and more likely the exact opposite of what it was, since flushing the plants soil has basically killed that one and turned it an incredibly light green color. :(

Anyhow, here on this plant I am seeing a somewhat similar effect. It is also occurring only towards the top of the plant.

I still won't rule out heat stress since it happens at the top and the plants do occasionally come into contact with the bulbs (even though they are just fluorescents).

My best guess this time (if it isn't heat stress from being too close to the lights that is) is zinc deficiency, but any of you gurus are welcome to correct me if you think it's something different.

I've also stumbled upon a thread on here once where someone said when the leaves are praying upward it's a sure sign of zinc deficiency - and this plant has generally been doing that for most of its life, though so are a couple others I have which look perfectly lush green all over.

PS: sorry some of the pics aren't as clear as they should be. I figured, they are still leaps and bounds clearer than many I see on here, so figured it would be safe to post 'em. ;)

donkey smell.
 

Attachments

P

Psychotic Psychonaut

Member
Wow.. you seem quite sure. :)

I'm gonna check out the pics on potasium deficiency and look into this.

I use some generic high in nitrogen fertilizer stuff.. cause well.. that's basically all you can get in this blasted country. I've ordered high in phosphorus bat guano for flowering, and I just picked up some fertilizer that is highest in potassium, so I'll mix a little of that in.

For the most part I've been feeding them all the time when I water (twice a week), but I've cut it down to every other now.

I really hope it is something as simple as you said because I have stuff suited for this which I think will help.
 
Phelps

Phelps

Well-Known Member
Psychotic Psychonaut said:
Wow.. you seem quite sure. :)

I'm gonna check out the pics on potasium deficiency and look into this.

I use some generic high in nitrogen fertilizer stuff.. cause well.. that's basically all you can get in this blasted country. I've ordered high in phosphorus bat guano for flowering, and I just picked up some fertilizer that is highest in potassium, so I'll mix a little of that in.

For the most part I've been feeding them all the time when I water (twice a week), but I've cut it down to every other now.

I really hope it is something as simple as you said because I have stuff suited for this which I think will help.
Click to expand...
It is definately K deficiency, that Im positive of. The question is why...
Also, watch the feeding strength. Its ok to feed every watering, but it should be at no higher than 1/3 strength. Cannabis is a light eater compared to other plants.
K def can be caused by excessive calcium or magnesium, a low PH, and obviously not having enough K...
Basically, u want a ratio of 1:1:2 (N:P:K)
If u have one part Nitrogen, u want 1 part phosphorus and 2 parts potassium. Most generic plant fertalizers are high in Nitrogen and lack the others.
If u want, give me the brand name of all the stuff u have and I will put a recipe together for u to use.
 
lonleysmoka

lonleysmoka

Active Member
Psychotic Psychonaut said:
Okay, well I had posted some pics and a thread for another one of my plants a week or two back. I suspected it was heat stress from being too close to the bulb, but the best advice I was given was that it looked like early signs of nutrient burn. That turned out to be incorrect, and more likely the exact opposite of what it was, since flushing the plants soil has basically killed that one and turned it an incredibly light green color. :(

Anyhow, here on this plant I am seeing a somewhat similar effect. It is also occurring only towards the top of the plant.

I still won't rule out heat stress since it happens at the top and the plants do occasionally come into contact with the bulbs (even though they are just fluorescents).

My best guess this time (if it isn't heat stress from being too close to the lights that is) is zinc deficiency, but any of you gurus are welcome to correct me if you think it's something different.

I've also stumbled upon a thread on here once where someone said when the leaves are praying upward it's a sure sign of zinc deficiency - and this plant has generally been doing that for most of its life, though so are a couple others I have which look perfectly lush green all over.

PS: sorry some of the pics aren't as clear as they should be. I figured, they are still leaps and bounds clearer than many I see on here, so figured it would be safe to post 'em. ;)

donkey smell.
Click to expand...
did you figure this out?? I have a plant that is starting the same thing.....here take a look...its in my sig on page 30 pics 6-8 tell me what you think??
 
c5rftw

c5rftw

Well-Known Member
Doesn't look like it to me

Zinc Deficiencies appear as chlorosis in the inter-veinal areas of new leaves producing a banding appearance as seen in figure 18. This may be accompany reduction of leaf size and a shortening between internodes. Leaf margins are often distorted or wrinkled. Branch terminals of fruit will die back in severe cases.
Also gets locked out due to high pH. Zn, Fe, and Mn deficiencies often occur together, and are usually from a high pH. Don't overdo the micro-nutrients- lower the pH if that's the problem so the nutrients become available. Foliar feed if the plant looks real bad. Use chelated zinc. Zinc deficiency produces "little leaf" in many species, especially woody ones; the younger leaves are distinctly smaller than normal. Zinc defeciency may also produce "rosetting"; the stem fails to elongate behind the growing tip, so that the terminal leaves become tightly bunched.





 
c5rftw

c5rftw

Well-Known Member
Looks over-nuted by just a little... use 3/4 or 2/3 the amount of nutes your giving it



 
You must log in or register to reply here.
Top