r/ArgEntos

Inicio en cultivo

Hola gente, quería iniciar en esto del cultivo. Tuve una planta pero dio unos resultados decentes pero al ver resultados de otra gente cultivando en exterior mis frutos fueron mucha mas hoja que cualquier cosa. Agradecería cualquier consejo y ayuda que me puedan dar

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u/SantiLoloDance — 1 day ago

Parte de la cosecha banana blaze living soil no till

385g secos en 1x1 (espacio 75% ocupado) nutricion knf

u/mirta420 — 1 day ago

Tipo de sustrato

Hola chicossss cómo están, cómo mi primer cultivo no está saliendo bien, ya me voy armando para corregir los errores, así no me pasa denuevo. Que sustrato liviano me recomiendan! Escucho sus consejos !

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u/Academic_Ad4081 — 1 day ago

flores sabor mandarina

literalmente saben a mandarina, me dijeron que eran re premium y qsyo, pero saben a mandarina

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u/BalakeDem — 1 day ago

2 Moby dick auto BSF

Dos semas que tengo en mi indoor, llevan 10 dias desde que asomaron los cotiledones, desde la germinacion directa en sustrato growmix multipro en macetas de 15L. parecerian ser fenotipos diferentes, por las hojas y como van creciendo, una se estiro unos cm mas tambien. Capaz estoy flashando recien son plantulas. Dicen ser productoras estas semas de BSF, tengo tambien en las mismas condiciones una rainbows auto BSF y una apple & banana de Epic genetics (banco nacional). veremos como sigue

u/Ciromarci1 — 1 day ago

Las plantas contentas, los hongos contentos yo contento

Atr el living soil, ( el dino es marihuano)

u/lucase363636 — 1 day ago

Estamos para cortar ? Opinión

Buenas como va

Quisiera saber qué opinan y si ya la ven óptima para corte.
Es una cuasi frutti de SRS ( según el banco, estamos en fecha )

Saludos!

u/Adventurous-Funny144 — 2 days ago

Lm281b+pro o lm301h evo

Buenas, estoy pensando en comprarme un panel, viendo la diferencia de precios entre los chips me surgio la duda si hay tanta diferencia entre ambos, me compro los lm281b o realmente vale la pena estirarme para los otros?

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u/Puzzled_Addendum6382 — 2 days ago

¿Debería preocuparme?

Algunas hojas de abajo de todo, donde arranca el scrog tienen este aspecto terrorífico, al principio eran 1 o 2 que arranque, hace como una semana.

Ahora, encontré dos más en este estado, pero la planta en general se ve relativamente sana

u/Over_Highlight_6555 — 2 days ago

NECESITO AYUDA GENTE

Venian perfectas , hasta hoy que aparecieron asi, me faltan 3 semanas para cortar. Alguei tiene idea que carajo les pasa? EC en 1.6 nutrientes athena pro ph en 6, ec runoff me dio 1.9

u/Traditional_Ear_3657 — 2 days ago

Que opinan? Es mi primera vez haciendo scrog, están cumpliendo hoy 2 meses de vege, cuanto faltaría para pasar a flora, algún consejo? Son Tropicana cookies Ff de Fastbuds

u/Cultural_Golf_7803 — 2 days ago

Ayuda les afecto el frío?

Hola cómo están? Soy de Córdoba y las temperaturas ya están bajas (menos de 10 grados todos los días) hace 5 días pase mi planta a flora en un indor 80x80, al principio tenía solo algunos tallos morados, por lo que le puse botellas con agua caliente para que calentará, pero se ve que no funcionó porque ahora tiene algunas hojas amarillas y manchas marrones en las mismas. También como se ve en las imágenes está decaída. Será solo el frío? Que otra cosa puede tener? Uso ferti marca biobizz y mido ph y ec.

u/Bondiolita007 — 2 days ago
▲ 13 r/ArgEntos+1 crossposts

Subcanopy and Inter-Canopy Supplemental Light Enhances and Standardizes Yields in Medicinal Cannabis (Cannabis sativa L.)

https://www.mdpi.com/2223-7747/14/10/1469

tl;dr- Yield goes up fairly linearly as you add lower light. I have theory below.

Paper highlights

  • The raw electrical efficiency (REE) values for FDW production were 1.49 g·kWh−1 (top only), 1.61 g·kWh−1 (subcanopy), and 1.48 g·kWh−1 (inter-canopy). These results indicate that subcanopy was the most power-efficient strategy, providing an advantage of about 8.2% over TL and ICL for producing dry inflorescences.* (see section 2.5, page 10)

  • There could be a slight decrease in potency with increase yield. This is often called the dilution effect. THC yield per area goes up by adding more light.

  • Lower flower terpenes went up by ~12%.

  • n=24 which is better than most cannabis studies

Other related paper on lower lighting:


my anecdote and what not to do

I am very, very skeptical of any gimmick lighting claim with the exception of just blasting the lower leaves in addition to the top. Papers like this are backing the claim that subcanopy and inter-canopy lighting will work for improving your yield per area or volume, and maybe per energy input. As a skeptic, I would want to see more testing to support the claimed improvement in yield per unit of energy from subcanopy lighting.

As anecdote of what I found won't work well, I used to (~2009-2013) design "bud blasters" where I would try to up close and directly illuminate the buds themselves without light blasting the leaves as hard to try to improve yield locally. They were six 3 watt high power LEDs mounted on a small linear heat sink and a 3 layer heavy duty aluminum foil reflector was used to strongly couple the light into the buds. I tried a variety of wavelengths like 660 nm red and including novelty ones like warm white combined with green. They basically didn't work nor should they because they were only producing a relatively small amount of sugar through additional photosynthesis. (those cheaper LEDs I used were around 25% efficient at most compared to lowers 80s today for SOTA).

I was running them maybe 5-8 watts true inches away from buds and there was not much if any difference. I've also tried high power diode lasers with beam spreaders up close to try to really localized on individual buds to see if direct bud blasting works to improve yields. There was no apparent difference in my personal experiments and the equipment was a hassle to work with.

Blasting the lower leaves with light in addition to the top light is the only technique that I know of that will obviously improve yields per area or volume.

If people are interested I could post some pics of what didn't work.


About this paper getting published

This paper was published with MDPI, which is a publisher that does not have a great reputation. Their standards are generally lower than publishers like Springer Nature, and the fast turnaround can lead to rushed and reduced peer review quality. But most MDPI journals are indexed in Scopus, so they are treated as legitimate academic sources.

Whenever I see something published in MDPI, I always ask why since they have had past strong allegations of being predatory. Many early career scientists publish with MDPI which is understandable. Serial publishing in MDPI is generally not how you get academic tenure in most fields, though.

This paper was produced by a private biotech company in Spain, Phytoplant Research S.L.U., and it still got published in an academic journal. That’s pretty normal for applied science and engineering. It is less common in basic plant biology, because the top-tier journals tend to favor work from universities rather than applied commercial studies.

Being a private company might explain why they used MDPI as a publisher.

They were funded through a government grant as part of a larger research project, which does add credibility. These grants often include money to cover the APC (Article Publication Charge) charged by journals, and MDPI’s fees as a publisher are a few thousand dollars. $2000-3000 is what it typically costs the author to get a paper published, higher with the higher-tier publishers.

The paper itself looks solid and the authors seem well qualified. The study was n=24 plants, which is larger than you see in most cannabis studies.


The optical bottom side of a leaf and gas exchange

I frequently see the internets (sic) say that only the top side of a leaf can use light and only the top side has photoreceptors. That’s not true at all. In a plant like cannabis, the main difference is that the top side has higher chlorophyll density and the bottom side has most of the stomata, which handle gas exchange of mainly CO2 and water vapor.

The higher chlorophyll density means that in a healthy dark green high nitrogen cannabis leaf, roughly 90-92 percent of red and blue light are absorbed by the upper surface, and upper 80s to 90 percent in some cases of green light is also absorbed, so just a little less than red and blue (remember that our eyes are about 5 times more sensitive to green than red/blue and we are biased to see green). That is based on my own spectrometer readings on cannabis. The underside of the leaf looks lighter green, so maybe 65-70 percent of green light is absorbed there, with red and blue still close to 88-90 percent at absorption dips. And once your lighting is inside the canopy, it barely matters which side is facing the light because the leaves around it will absorb the photons anyway.

Green light only becomes a potential factor with lighting from below the canopy where you might actually lose more of that reflected light. But this is mitigated if the subcanopy light facing upwards is also on a more reflective surface.

The stomata are pores mostly on the underside of the leaf, and they mainly let in carbon dioxide for photosynthesis and let out water vapor from transpiration and as a byproduct of photosynthesis. It's right around 98% water vapor from transpiration and maybe 2% from photosynthesis. Something close.

The stomata guard cells are blue light sensitive, and higher amounts of blue light will force them to open more than normal. Green light tends to push them toward closing. I am not aware of any studies showing that this blue versus green effect creates meaningful real world differences in plant performance or if their is a difference in gas exchange. I have seen it come up in discussions, though, so I wanted people to understand what the argument actually is. Ask for data and not theory in any discussion like that one way of the other.


Pressure flow hypothesis

You can light the lower leaves to increase photosynthesis in the lower canopy, and those produced sugars can be transported to the buds through the phloem. This is the pressure flow hypothesis:

If you want to easily test the pressure flow hypothesis in action, with a smaller plant maybe topped once, grow it under a light as normal, but leave space on the sides and set up PAR38 bulbs to blast the lower leaves. I have multiple Bridgelux Vero 10 at 5 watts on a 40 mm heat sink that I set up with smaller plants for under lights. Get a light meter with a remote sensor head down there. You are going to need to water more often.

But stuff that works when you’re just tinkering gets much more complex at commercial scale. SCRoG with under-canopy lighting adds labor, adds hardware to maintain, and increases heat load, which drives up AC costs.

With taller plants you have to determine what height the inner light bar is producing the best, and if you should be use multiple heights of light bars.


Safety

If you are going to pack lights into or below the canopy, they either need to be low voltage safe, or fixtures rated for wet locations. It needs to be IP rated for IP65 or above, and should say "Suitable for Wet Locations" on the safety label. Many Mean Well LED and other high quality drivers are going to be rated for this.

All intracanopy lighting should be on a GFCI/RCD circuit. I also tape cord caps so no energized copper can be exposed, using Scotch Super 33+ for long-term durability (from a safety stand point, this is no different than hard wiring a fixture).

In the past, I used custom 24 volt DC lighting powered by a fully isolated Mean Well supply, which is the safest architecture you can use below canopy.

What you absolutely should not do is place junk lights like the Mars Hydro TS600 below the canopy or other lights that do not use an external LED driver. Fixtures like these place line voltage directly on the LED circuit board with no isolation from ground, protected only by a thin conformal coating. That design is dangerous in dry conditions and outright lethal in a wet canopy. It's a stupid design. I discuss testing these lights in my lighting guides. (only the Mars Hydro TS250 is also designed like this)

Also keep in mind that quantum boards are mechanically fragile. When mounted in or below the canopy, it is easy to crack or knock LEDs off the board. If an LED or series segment opens, current can redistribute unevenly across the remaining parallel strings, pushing some LEDs above their rated current potentially causing thermal runaway and cascading failures.

It's best to use lights that have some sort of rigid cover over the LEDs to protect them.

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u/Kruegu3r — 2 days ago

Que le pasa a mi plantula

Es una de mis 4 autos de indoor, solo paso frio una noche, pero note que las puntas del segundo par de hojas se estan poniendo amarillito, La parte donde se esta haciendo el nudo se ve sana, deberia preocuparme? tiene alguna carencia, la regue demasiado, que onda?

u/Ciromarci1 — 2 days ago

Mis plantitas primer cultivo auto

60x60 macetas 15L
2 moby dick Xl Auto BSF
1 rainbows Xl auto BSF
1 apple and bananas epic genetics

germinadas semas directo al sustrato, ahora llevan desde q salio la plantula unos 8/9 dias, que se yo, Va un poco lenta por la oscilacion de temperatura pero creo que se ven sanas dentro de todo, es mi primer cultivo, sustrato growmix lightmix y tengo el tripack de biobizz, en una semana calculo arranco con biogrow con 1ml por litro de agua, y 250ml por maceta, Que dicen?

la apple se me puso las puntas amarillas, creeeo q fue el frio de los ultimos dias, voy a esperar a q siga creciendo el primer nudo y ver que pasa, pero ya lo solucione, las otras que se yo, parece que van bien, tengo ese cooler como ventilador interno, ahora lo acomode mas arriba asique pega mejor.

u/Ciromarci1 — 3 days ago

Alguien que haya probado estos?

Buenas gente últimamente estoy viendo mucho estos vaps, mi curiosidad es de donde mierda los traen y si verdaderamente pegan.

u/WillingnessNarrow762 — 3 days ago