Can't figure out what this is and it's killing my plants.

[ltecato]

lol, as much as I looked, I found no real credentials on this author, just a blogger, Next

He wrote that book long before anyone had even heard the term 'blogger.'
Also:

"Some plant leaves will start to turn yellow as they prepare for dormancy or complete their flowering period, in which case there is no need for alarm. "

http://www.midwestgardentips.com/yellow_leaves.html

 

[chuck estevez]

He wrote that book long before anyone had even heard the term 'blogger.'
Also:

"Some plant leaves will start to turn yellow as they prepare for dormancy or complete their flowering period, in which case there is no need for alarm. "

http://www.midwestgardentips.com/yellow_leaves.html

LMFAO, now you're comparing ground covering to MJ

from your own link

Other Problems

Of course there are other problems that could cause yellowing leaves. If it does not seem clear that you have been over watering or under fertilizing, you need to investigate other causes. You could have nutrient deficiencies in your soil that standard fertilizer will not resolve, so you might want to pick up a soil test kit. Or a virus or pest may be at work, which may take some research to determine. Each plant species are susceptible to specific pests and viruses, so begin a search related to the specific species and cultivar that you are having a problem with.

 

[Guy2HIGH]

Grow up Shmuck. You haven't proven anything, except that you're very immature.

https://www.facebook.com/RobertConnellClarke

http://mjgrowers.com/book_lets_research.htm
Ok Shmuck.. scroll down until you get to the "How do fan leaves function" section. You do know how to read , don't you Shmuck? If you get stuck on the big words, try and sound it out first... but if you need help, I'd be glad to help you with the big words.

 

[ltecato]

lol, as much as I looked, I found no real credentials on this author, just a blogger, Next

Also:

"Leaf senescence constitutes the final stage of leaf development and is critical for plants' fitness as nutrient relocation from leaves to reproducing seeds is achieved through this process. "

http://www.ncbi.nlm.nih.gov/pubmed/17177638

 

[chuck estevez]

Grow up Shmuck. You haven't proven anything, except that you're very immature.

https://www.facebook.com/RobertConnellClarke

http://mjgrowers.com/book_lets_research.htm
Ok Shmuck.. scroll down until you get to the "How do fan leaves function" section. You do know how to read , don't you Shmuck? If you get stuck on the big words, try and sound it out first... but if you need help, I'd be glad to help you with the big words.

you mad bro,lmfao i know, you don't like being wrong, but you are

 

[chuck estevez]

Also:

"Leaf senescence constitutes the final stage of leaf development and is critical for plants' fitness as nutrient relocation from leaves to reproducing seeds is achieved through this process. "

http://www.ncbi.nlm.nih.gov/pubmed/17177638

this about reproducing seeds, we try and keep the plant from doing that, marijuana studies please, by people with degrees, you know, Dr.s

 

[ltecato]

this about reproducing seeds, we try and keep the plant from doing that, marijuana studies please, by people with degrees, you know, Dr.s

Also:

"Throughout their lifespan, leaves undergo a series of developmental, physiological and metabolic transitions that culminate in senescence and death. Leaf senescence is an ‘altruistic death’ that allows for the degradation of the nutrients that are produced during the growth phase of the leaf and their redistribution to developing seeds or other parts of the plant, and thus is a strategy that has evolved to maximize the fitness of the plant."

http://jcs.biologists.org/content/126/21/4823.full

 

[chuck estevez]

Also:

"Throughout their lifespan, leaves undergo a series of developmental, physiological and metabolic transitions that culminate in senescence and death. Leaf senescence is an ‘altruistic death’ that allows for the degradation of the nutrients that are produced during the growth phase of the leaf and their redistribution to developing seeds or other parts of the plant, and thus is a strategy that has evolved to maximize the fitness of the plant."

http://jcs.biologists.org/content/126/21/4823.full

again, you are talking about trees and ground coverings, not weed,marijuana, we control everything in our grow, we aren't growing a tree that will be there year after year

 

[ltecato]

And here's another one:

"The earliest and most significant change in cell structure is the breakdown of the chloroplast, the organelle that contains up to 70% of the leaf protein. Metabolically, carbon assimilation (photosynthesis) is replaced by catabolism of chlorophyll and macromolecules such as proteins, membrane lipids, and RNA so that some of the released nutrients can be recycled."

http://www.plantphysiol.org/content/113/2/313.full.pdf

 

[chuck estevez]

And here's another one:

"The earliest and most significant change in cell structure is the breakdown of the chloroplast, the organelle that contains up to 70% of the leaf protein. Metabolically, carbon assimilation (photosynthesis) is replaced by catabolism of chlorophyll and macromolecules such as proteins, membrane lipids, and RNA so that some of the released nutrients can be recycled."

http://www.plantphysiol.org/content/113/2/313.full.pdf

first sentence from your link

Leaf senescence is the final stage of leaf development. In forests of deciduous trees,

 

[ltecato]

again, you are talking about trees and ground coverings, not weed,marijuana, we control everything in our grow, we aren't growing a tree that will be there year after year

"In many annual species the number of leaves entering the senescence program increases during flowering and seed development, allowing the assimilated nutrients in leaves (the source) to be transported ...."

http://www.plantphysiol.org/content/113/2/313.full.pdf

 

[ltecato]

first sentence from your link

Leaf senescence is the final stage of leaf development. In forests of deciduous trees,

Are you saying that only deciduous perennial plants experience leaf senescence?

 

[chuck estevez]

Are you saying that only deciduous perennial plants experience leaf senescence?

I am saying you posted a link and that was the first sentence from it, you are comparing a marijuana plant to a tree that lives yr after yr.

 

[ltecato]

"Many of the recent advances in our knowledge of plant senescence are due to extensive use of the model plant Arabidopsis thaliana."


http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2701846/

And Arabidopsis is an annual, not a perennial.

https://en.wikipedia.org/wiki/Arabidopsis_thaliana

 

[ltecato]

I am saying you posted a link and that was the first sentence from it, you are comparing a marijuana plant to a tree that lives yr after yr.

No, I am not doing that. I am merely pointing out that annual plants experience leaf senescence.

 

[Budzbuddha]

Sarcastic Grin * Grabs Popcorn *

 

[BarnBuster]

Clarke's own words from an interview

“Yeah, I have a Bachelor’s Degree in biology. The real incentive for writing my very first book was, basically, so I could graduate. It’s called ‘The Botany and Ecology of Cannabis’. It was self-published in 1977 – I know, I don’t look that old. I’d been there long enough, and I did have to graduate, plus I was getting to be very well versed in the subject… so I went to the library, and the first thing I found was Mark D. Merlin’s ‘Man and Marijuana’, written for his Master’s dissertation at UC Santa Barbara four years before. I used him as a precedent – hey, if he can do this, I can do this – so I wrote it and ended up publishing it, and that led to the subsequent books like ‘Marijuana Botany’.”

 

[HappyMan420]

we are growing unfertilized seeds, or what would be seeds. We are to make the plant eat as much as possible, get big and fat, and make it horny, and then starve it to death at its climax. Don't get jizz on it, and you have grown some dank.

 

[Guy2HIGH]

Hey guys, first time grower here.....i and i cant figure out whats killing my plants, i transplanted them out side about 2 weeks ago, and gave them a good fertilization before i have to go away. When i came back from a heavy heavy weekend of rain....this is what my plants looked like....... did i give them too much fertilizer or to much water?

Looks like your plant has a magnesium deficiency. The green veins, along with the yellowness of the entire surrounding leaf is the giveaway. Also, the discolored leaf tips/edges and the curling leaf edges tells me that this is a magnesium deficiency.
Give your plant some Epsom salts, mix at 1 Tbsp per gallon of water or cal/mag at 1/2 strength, as to not over do it.

I think the heavy rains you had leached away most of the fertilizer you fed the plant before you left.. causing the deficiency.

Epsom salts contains around 10% magnesium and about 13% sulfur.. magnesium also helps plants intake nutrients like nitrogen, sulfur and potassium.

 

[Guy2HIGH]

Because they have finished setting the mast crop. Changing leaves announce things are done and we are getting ready for next spring. Wait this long with cannabis and hermis will appear most likely, C-3 survival method. Comparing deciduous plants to annuals. You do know the difference between an annual and deciduous or perennial plant don't you?

What mast crop are you talking about, cannabis does not have a mast crop. Mast is the edible vegetative parts or seeds produced by woody species of plants, like trees and shrubs. A mast crop only pertains to forest nut trees, like acorns or the fruit of the beech tree. Maybe you're talking about hard mast.. tree species such as hickory or beech produce hard mast. Or maybe you're talking about soft mast... trees and shrubs produce soft mast such as catkins and rose hips. Or you could have meant mast seeding.. which only occurs in monocarpic or semelparous species where plants only reproduce once in their lifetime, then die.
Cannabis plants are dioecious plants, so obviously, it cannot happen with cannabis.

Are you trying to say that long-winded sativas will hermie before they are finished flowering?
Do you know what the difference between a hermaphroditic plant and a monoecious plant is? So which one are you talking about?