Plant Nutrients for white LEDS?

Most nutrient guides for cannabis have been made with HPS/MH in mind. But i've read several times in these forums that using white LEDS (say: cobs, quantums, strips, whathaveyou...) requires a different nutrient balance. Specially more CALMAG...

How come? Is this just a saying or is there any truth to these sayings?

Can anyone chime in on this subject?

Any help is appreciated

eyderbuddy said:

Most nutrient guides for cannabis have been made with HPS/MH in mind. But i've read several times in these forums that using white LEDS (say: cobs, quantums, strips, whathaveyou...) requires a different nutrient balance. Specially more CALMAG...

How come? Is this just a saying or is there any truth to these sayings?

Can anyone chime in on this subject?

Any help is appreciated

Click to expand...

The theory goes like this: the lack of infrared light in white LEDs means you'll have lower temps at the canopy, which means the leaves don't transpire as much as under HID. Less transpiration means less nutrient uptake. This is why most here recommend that you run your grow space warmer than when growing with HID - 80°F+.

All that said, a couple growers here seem to do fine with temps in the mid-70s. I am not one of those growers. I observed a SIGNIFICANT increase in overall plant health when I got my tents up over 80°. I'm off the bottle now (organic home-mixed soil on perlite SIPs), but yeah, added calmag is a good idea. You'll have to play with your ratios to dial it in just right.

With environment dialed in (temps/humidity) feeding is no different from conventional lighting ime.

Check this out.. https://greenleafnutrients.com/?v=f24485ae434a ... They give free samples, you pay $3 shipping..
Good stuff...https://www.rollitup.org/t/greenleaf-nutrients-and-mega-crop-happy-to-be-on-rui.946071/

Thanks

I'm going to try Epsom salt for Mag.
Some strains get pale leaves.
Cal-Mag wasn't the answer for me.

hybridway2 said:

I'm going to try Epsom salt for Mag.
Some strains get pale leaves.
Cal-Mag wasn't the answer for me.

Click to expand...

That's the same problem i've been having, but maybe the CALMAG formulation i bought isn't doing the job?

I just bought some Epsom Salt and will be testing to see if there are any results

eyderbuddy said:

That's the same problem i've been having, but maybe the CALMAG formulation i bought isn't doing the job?

I just bought some Epsom Salt and will be testing to see if there are any results

Click to expand...

Cool! Lmk of you remember.

I would be interested to see the effect of backing off on the nutrient strength. Particularly in a hydro or coco grow.
Lower EC = easier absorption / more drinking
Some of the healthiest LED grows I have noticed have been in soil
Just a thought anyways

OneHitDone said:

I would be interested to see the effect of backing off on the nutrient strength. Particularly in a hydro or coco grow.
Lower EC = easier absorption / more drinking
Some of the healthiest LED grows I have noticed have been in soil
Just a thought anyways

Click to expand...

Soil Keeps em green fo sho.

http://www.pacificlightconcepts.com/led-tips/

Nutrients
Sometimes magnesium deficiencies are reported when making the switch to LED’s. This is because magnesium is a central element in the production of chlorophyll. When we make the move to LED’s, a more chlorophyll targeted spectrum is part of the benefits. As well as overall higher photosynthetic activity. But in order to reap those benefits, we need to match the elemental requirements of the increased chlorophyll focused reactions taking place.

Common hydroponic fertilizers recipes, usually contain between 40-60ppm Mg. We have found that a range or 75-90ppm of Mg to ideal under LED lighting. The best way to increase only Mg and not introduce more nitrogen, is to add 1gram of epsom salt(Magnesium Sulfate) per gallon of nutrient solution. 1gram/gallon of epsom salt adds ~25ppm of Mg and 30ppm of S, and is usually a sufficient supplement to most fertilizer programs.

***It is important to note that “CAL-MAG” is not an element or a deficiency. They are two separate elements(calcium and magnesium) that each have separate functions and roles in the plant. They need to be addressed individually for successful diagnosis and nutrient correction.

Wow 75-90!? Mine have only been getting about 35 ppm mag(4g mega crop per gallon) and they seem to be doing fine. My humidity has been pretty high though so maybe the plants are transpiring less and using less nutes? I just got it down to 50 rh from 70 so I'll be keeping am eye out for deficiencies ..

Oh wait I'm a dumbass. My soilless mix has dolo and agricultural lime...that's probably helping.

I noticed since I started adding a little vermicompost to my coco mix, the plants stopped shouting for magnesium....

dubekoms said:

Wow 75-90!? Mine have only been getting about 35 ppm mag(4g mega crop per gallon) and they seem to be doing fine. My humidity has been pretty high though so maybe the plants are transpiring less and using less nutes? I just got it down to 50 rh from 70 so I'll be keeping am eye out for deficiencies ..

Click to expand...

Mega Crop = Mega hype

OneHitDone said:

Mega Crop = Mega hype

Click to expand...

I agree people love to over hype shit. Nutes IMO don't matter as much as common sense and good watering practices. It was free(besides shipping) so I thought why not. Its been doing good so far, no deficiencies but I do need to up the dose as little. I have some purple stems but i think that's more cold related. No phing either lol just mix it up and dump it

Hygrozyme or pondzyme helped me in a desperate time of need, after making a huge batch of zyme its part of my normal feeding.
My space is cold also so i added a small heater set at lowest setting(500w) @68* at night, sealed room with lights on hits 79-82* plants look fantastic

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