LED and BUD QUALITY

[exoticrobotic]

if you guys actually read what Ca++ contributes you wouldn't even feel like he's chastising anyone, y'all cant seem to be able to read and add

It feels like any negative comment on people's experience with leds is met with scorn.

This I dont understand unless you have skin in the game.

Luckliy there is the occasional great bit of info here too.

 

[Normannen]

It feels like any negative comment on people's experience with leds is met with scorn.

Luckliy there is the occasional great bit of info too.

I have not have had that impression, on the other hand he seems to be getting a lot of flak for replying, really well, in my opinion, to other, less educated and intelligent users who are, in fact, deriding, outright ignoring or denigrating his contributions.

 

[Cerathule]

Also, it can be shown that many plant nutritional ions/elements can be exchanged by the roots even in darkness, esp. these that mostly move through the soil solution by diffusion and are actively exchanged. Ofc everything that is solved in the water and tiny enough to pass the channels will also be taken in by the plant passively via the massflow. The uptake of Calcium & Bor is somewhat tight to the evapotranspiration although Cannabis is special in that it can absorb Ca also quite active, as the root excret alot of H+ exchange ions which acidify the rhizosphere and this has the power to free Ca from the cation exchange complex of many substrates.
At the end we are left with about 85% of carbon in the drymatter and the rest must come from the fertilizer. It stands to reason the more C the plant could fix the rest must follow. The higher evapotranspiration of HPS when missing after a change to LED can be compensated by a change in the fert formulae.

 

[exoticrobotic]

His contributions are great.

Just wish he's post a photo of his grow so i could see what a difference these things make, if at all.

 

[exoticrobotic]

The higher evapotranspiration of HPS when missing after a change to LED can be compensated by a change in the fert formulae.

How so Cerathule?

Please explain.

 

[Normannen]

His contributions are great.

Just wish he's post a photo of his grow so i could see what a difference these things make, if at all.

Is it so hard to click on his profile? But then again, if you actually read the articles he contributes and thought about what he's actually saying, you wouldn't need a picture (which, in the age of AI bots and Photoshop, personally, I think is one of the things that most demonstrates a person's absolute lack of imagination and possibly intelligence to ask for on a thread that is about physiology on aforum chuck full of amateurs). But If you really do and doubt, use that blessed finger of yours to click on the profile and take a look at their media file...or are you seriously that impaired? Because if you are, I am surprised you are even able to type!

 

[exoticrobotic]

.or are you seriously that impaired? Because if you are, I am surprised you are even able to type!

See theres that scorn again...

Wtf?

Its a thread about growing with leds.

Would be great to have pics along with comments so some old impaired codger like myself who can hardly type doesnt have to ask the home help for assistance in searching a profile.

 

[JKD]

The problem with photos is the shifting goal posts.
When LED buds look fire the critique becomes aroma, or effect.
When that happens, you have to take the persons word for it - or not.
The same as if they don’t post photos.

 

[Cvh]

Hi guys please try to keep it civil and respectful to each other in this thread. We have received several reports and have seen (and edited) several insults. Thanks!

 

[CannaT]

We need to differentiate between evapotranspiration and metabolism, because it's not that when leaves loose more water the plant grows better. Most of the water is used for cooling and C3 doesn't like it too hot, because then plant will increasingly use oxygen as the substrate for photosynthesis, instead of carbon dioxide, leading to increased photorespiration and loss of carbon instead of gain. Still, the enzymatic biochemical reactions inside a plant benefit from warmth, but all that doesn't help when the biggest building block - carbon - is missing or not at optimum levels. Because of this there exists an almost linear relationship with the acquisition of biomatter and the rate of photosynthesis done.

Diodes now put out more PAR than HPS, while HPS puts out way more heat radiation. Make no mistake the 730nm spec hump you see in many LED racks is not there to deliver heat into leaves, as such 1500nm or 2500nm would be much more appropriate. The 730nm light mostly transmits plant leaves but is sensed, and weighted, by the phytochrome photoreceptor family and a few rare darkred di- & trimeric chlorophyll-groups around the core of photosystem I and one antenna of photosystem II. The radiation between 700 - 780nm has actually a unique quality whenever it is absorbed by chlorophyll it can still power photochemical work just as PAR - even though it lacks the minimum energy requirement - said energy will be taken from the latent heat locale at that side, that is, and has been measured quite accurately, Far Red can have a tiny photoprotective role whereas other IR can still help deliver this locale latent energy much better than convective.

Water-use-efficiency is just better under LED, they still drink as photosynthesis itself opens stomatas up, that's better than if mostly for cooling. If leaves get too hot stomatas even close in an evolutionairy coded attempt to preserve more water during periods of long hot- and dryness.

Plants take up nutrients from the soil through water. This process is known as nutrient uptake. Plant roots absorb water and the dissolved nutrients in the soil, which are then transported to various parts of the plant to support growth and development.
Plants with higher metabolic activity, such as those in the active growth phase, generally require more water to support their metabolic processes. Water is essential for various biochemical reactions in plants, including photosynthesis and transpiration. Increased metabolic activity often leads to higher transpiration rates, which can result in greater water uptake by the plant to meet its needs. This is why it's important to provide adequate water to plants, especially during periods of rapid growth or in hot, dry conditions.

Plants with high metabolic activity tend to have a correspondingly higher water consumption because water is a fundamental component in many metabolic processes, including photosynthesis and transpiration. However, some plants have adaptations that allow them to use water more efficiently and survive in arid or water-limited environments. These adaptations might include:

1. Succulence: Some succulent plants store water in their leaves, stems, or roots, allowing them to survive with lower water consumption.
2. Reduced Transpiration: Some plants have mechanisms to reduce water loss through transpiration, such as small or thick leaves, or opening and closing stomata during specific times.
3. Deep Roots: Plants with deep root systems can access water from deeper in the soil, making them more drought-tolerant.
4. CAM Photosynthesis: Certain plants, like many cacti, use Crassulacean Acid Metabolism (CAM) photosynthesis, which allows them to open their stomata at night when it's cooler and more humid, reducing daytime water loss.

So, while high metabolism usually requires more water, some plants have evolved strategies to be more efficient with their water usage in challenging environments.

Yep its not always a case,nothing in the world is absolute, but that's why we say that there are always exceptions that confirm the rules.

 

[Crooked8]

Plants take up nutrients from the soil through water. This process is known as nutrient uptake. Plant roots absorb water and the dissolved nutrients in the soil, which are then transported to various parts of the plant to support growth and development.
Plants with higher metabolic activity, such as those in the active growth phase, generally require more water to support their metabolic processes. Water is essential for various biochemical reactions in plants, including photosynthesis and transpiration. Increased metabolic activity often leads to higher transpiration rates, which can result in greater water uptake by the plant to meet its needs. This is why it's important to provide adequate water to plants, especially during periods of rapid growth or in hot, dry conditions.

Plants with high metabolic activity tend to have a correspondingly higher water consumption because water is a fundamental component in many metabolic processes, including photosynthesis and transpiration. However, some plants have adaptations that allow them to use water more efficiently and survive in arid or water-limited environments. These adaptations might include:

1. Succulence: Some succulent plants store water in their leaves, stems, or roots, allowing them to survive with lower water consumption.
2. Reduced Transpiration: Some plants have mechanisms to reduce water loss through transpiration, such as small or thick leaves, or opening and closing stomata during specific times.
3. Deep Roots: Plants with deep root systems can access water from deeper in the soil, making them more drought-tolerant.
4. CAM Photosynthesis: Certain plants, like many cacti, use Crassulacean Acid Metabolism (CAM) photosynthesis, which allows them to open their stomata at night when it's cooler and more humid, reducing daytime water loss.

So, while high metabolism usually requires more water, some plants have evolved strategies to be more efficient with their water usage in challenging environments.

Yep its not always a case,nothing in the world is absolute, but that's why we say that there are always exceptions that confirm the rules.

would you say that telling us all that “led buds with sc compounds dont exist” is a black and white statement? Especially without any form of analysis besides your nose?

You also seemed disheartened when people spoke down to you. Just so you know thats how it felt when you called me “ignorant” and told me i “needed to work on myself”. I never once called you a name, cursed or spoke down to you. Thats pretty damn rude and unfounded, it was why I stopped engaging. I also never reported anything, so its likely others agreed that you werent being professional and just being harsh for no reason.

 

[CannaT]

would you say that telling us all that led buds with sc compounds dont exist is a black and white statement? Especially without any form of analysis besides your nose?

It exist probably but not in noticable amounts that my senses feel.
If my statements are so apsurd to you put mini hps and few small clones in your grow room and try I also make experiments.
I will make here one experiment soon here I will sprout few plants in soil and put them under small led diode and and an ordinary household incandescent light bulb side by side one close to another.
Led will have that "perfect visible spectrum "
While we all know that incandescent is almost pure IR with shity spectrum.
Im curious in which way seedling will grow.

 

[Crooked8]

It exist probably but not in noticable amounts that my senses feel.

Ok well at least youve come around in that regard, especially since youve only had your personal experience to go by.

 

[CannaT]

Ok well at least youve come around in that regard, especially since youve only had your personal experience to go by.

Maybe sometimes I look like rude,but being high with language barrier in 99% if i dont use translator I cant put my toughts in words properly.
Im not guy that Im always right ot something Im open for doscussion and good statements will change my mind.
Im not glued to Hps or Led i grow them both and just share my expirience.

 

[Crooked8]

Maybe sometimes I look like rude,but being high with language barrier in 99% if i dont use translator I cant put my toughts in words properly.
Im not guy that Im always right ot something Im open for doscussion and good statements will change my mind.
Im not glued to Hps or Led i grow them both and just share my expirience.

I can understand the language barrier thing. I do think calling someone ignorant, especially when its clear they have a lot of experience, will universally be found insulting. If that wasnt your intention i understand. Thank you for that clarification.

 

[CannaT]

Why cannabis smells like skunk – and how that could soon change

Researchers recently identified the chemical source of marijuana's distinctive scent. The finding could help lead to less pungent pot or strains with new flavours

www.newscientist.com

Dark

Subscribe now

Chemistry​

Why cannabis smells like skunk – and how that could soon change​

Researchers recently identified the chemical source of marijuana's distinctive scent. The finding could help lead to less pungent pot or strains with new flavours
By Jeremy Hsu
31 October 2023

A whiff of weed
Perspective Jeta/Shutterstock

Love it or loathe it, marijuana’s scent is certainly distinct. Just ask the professional tennis players at the 2023 US Open who voiced discomfort about the pungent pot miasma drifting into outdoor courts from a nearby park in Queens, New York. Alexander Sverev described one court to the Associated Press as smelling “like Snoop Dogg’s living room”.
The whiff of weed has become increasingly familiar across much of the US following a wave of state-level legalisation. In Santa Barbara county, California – home to more licensed cannabis growers than any other county in the state – residents and business owners have intensified complaints about the associated stench in recent years. So what is it that actually gives marijuana its smell?
Scientists had long assumed that weed’s dominant odours mainly involve naturally occurring chemical compounds called terpenes, which also play a role in the psychoactive and medicinal properties of marijuana. But these form the underlying canvas for a cannabis strain’s overall odour rather than providing the most unique and standout smells.
Two independent research groups recently discovered a different type of chemical playing the starring role in marijuana’s distinctly skunky scent – volatile sulphur compounds known as thiols that contain a molecule called 3-methylbut-2-en-1-yl (321MBT).

You can have terps but if you dont have SC we cant talk about real pungency .
Maybe some scientist read my nose experiments.

 

[CannaT]

I can understand the language barrier thing. I do think calling someone ignorant, especially when its clear they have a lot of experience, will universally be found insulting. If that wasnt your intention i understand. Thank you for that clarification.

I use ignorant cuz I tought it mean neglecter.
I just check this on translator.
Sry my bad words.

 

[JKD]

Why cannabis smells like skunk – and how that could soon change

Researchers recently identified the chemical source of marijuana's distinctive scent. The finding could help lead to less pungent pot or strains with new flavours

www.newscientist.com

Dark

Subscribe now

Chemistry​

Why cannabis smells like skunk – and how that could soon change​

Researchers recently identified the chemical source of marijuana's distinctive scent. The finding could help lead to less pungent pot or strains with new flavours
By Jeremy Hsu
31 October 2023

A whiff of weed
Perspective Jeta/Shutterstock

Love it or loathe it, marijuana’s scent is certainly distinct. Just ask the professional tennis players at the 2023 US Open who voiced discomfort about the pungent pot miasma drifting into outdoor courts from a nearby park in Queens, New York. Alexander Sverev described one court to the Associated Press as smelling “like Snoop Dogg’s living room”.
The whiff of weed has become increasingly familiar across much of the US following a wave of state-level legalisation. In Santa Barbara county, California – home to more licensed cannabis growers than any other county in the state – residents and business owners have intensified complaints about the associated stench in recent years. So what is it that actually gives marijuana its smell?
Scientists had long assumed that weed’s dominant odours mainly involve naturally occurring chemical compounds called terpenes, which also play a role in the psychoactive and medicinal properties of marijuana. But these form the underlying canvas for a cannabis strain’s overall odour rather than providing the most unique and standout smells.
Two independent research groups recently discovered a different type of chemical playing the starring role in marijuana’s distinctly skunky scent – volatile sulphur compounds known as thiols that contain a molecule called 3-methylbut-2-en-1-yl (321MBT).

You can have terps but if you dont have we cant talk about real pungency .
Maybe some scientist read my nose experiments.

I read this also.
It’s interesting as in beer the same compounds are produced if exposed to sunlight (lightstruck or skunked beer). Brown bottles are used to prevent it - they do so by blocking UV.

 

[Cerathule]

But it is somewhat believably that whenever the light spectrum changes, so does part of the internal chemistry of the plant. Still, most of what is happening is down to genetics and there is no guarantee that different genotypes react equally - in a biochemical sense - to changes in light specs. So it will be impossible to generalize this on a broader scope. We'd first need to get away from strain names and register plants genetically incl. their biochemical properties of aromatic and psychotropic compounds.

Plants take up nutrients from the soil through water. This process is known as nutrient uptake. Plant roots absorb water and the dissolved nutrients in the soil, which are then transported to various parts of the plant to support growth and development.
Plants with higher metabolic activity, such as those in the active growth phase, generally require more water to support their metabolic processes. Water is essential for various biochemical reactions in plants, including photosynthesis and transpiration. Increased metabolic activity often leads to higher transpiration rates, which can result in greater water uptake by the plant to meet its needs. This is why it's important to provide adequate water to plants, especially during periods of rapid growth or in hot, dry conditions.

Plants with high metabolic activity tend to have a correspondingly higher water consumption because water is a fundamental component in many metabolic processes, including photosynthesis and transpiration. However, some plants have adaptations that allow them to use water more efficiently and survive in arid or water-limited environments. These adaptations might include:

1. Succulence: Some succulent plants store water in their leaves, stems, or roots, allowing them to survive with lower water consumption.
2. Reduced Transpiration: Some plants have mechanisms to reduce water loss through transpiration, such as small or thick leaves, or opening and closing stomata during specific times.
3. Deep Roots: Plants with deep root systems can access water from deeper in the soil, making them more drought-tolerant.
4. CAM Photosynthesis: Certain plants, like many cacti, use Crassulacean Acid Metabolism (CAM) photosynthesis, which allows them to open their stomata at night when it's cooler and more humid, reducing daytime water loss.

So, while high metabolism usually requires more water, some plants have evolved strategies to be more efficient with their water usage in challenging environments.

Yep its not always a case,nothing in the world is absolute, but that's why we say that there are always exceptions that confirm the rules.

With some exceptions the majority of plant nutrition must be dissolved in the soil solution. If the nutrition is still in the solid phase of the soil then plants can't uptake it. There are 2 basic methods of how this water is uptaken: Via the transpirational pull and the osmotic root pressure.

 

[CannaT]

A new study is offering one of the most comprehensive investigations ever conducted into the chemical origins of cannabis' unique “skunk-like” smell. The study reveals an entirely new family of sulfur compounds accounts for the novel odor and these molecules are chemically similar to aroma compounds found in garlic.

That is what im talking about I dont get much of these scents under leds even if plant have more resin etc ..and then someone mesure terps and i feel with my nose that they are stronger under leds than under hids more flavour more rounded is with leds some new strains taste like candys literally.
While bubblegum under led have that sour gluish,metalic scent again it missing that fresh cutted garlic like scent which I always have with hids.
I feel good now cuz science more and more backs up my theory.