LED's and cal/mag def = ONLY extra cal/mag needed or just up ppms due to more par levels?

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Dan_J

Active Member
Howdy folks ;)

With all the need for extra cal/mag under LED's i was just wondering if it's because of the spectrum of most LED's or are LED's just super efficient producing more par levels at closer canopy heights due to less heat thus the need to up the PPM's of the complete nutrients not just cal/mag?

thoughts?

cheers
 
I believe it is an effect of LIebig's Law of the Minimum. Adding higher quality light or more light increased the demand for Mg (and possibly Ca). Mg became the limiting factor.
 
Its better to think in totals than in concentrations: more efficient spectrum (possibly) but also that your led light doesnt create as much radiant heat, which means lower leaf temps, lower transpiration, drinking less. You have to dial it in between concentrations in the root zone and your environment. More of a weaker juice or less of a stronger juice.
But you can see only increase rootzone concentration up to a point, eventually youll create lock outs of no other nutrients.
So generally grow with a little hotter temps, especially in veg
 
Rocket Soul said:
Its better to think in totals than in concentrations: more efficient spectrum (possibly) but also that your led light doesnt create as much radiant heat, which means lower leaf temps, lower transpiration, drinking less. You have to dial it in between concentrations in the root zone and your environment. More of a weaker juice or less of a stronger juice.
But you can see only increase rootzone concentration up to a point, eventually youll create lock outs of no other nutrients.
So generally grow with a little hotter temps, especially in veg
Click to expand...
Agreed with rocket soul increase temps using led and say goodbye to mg deficiencies its tricky to do in winter but there are plenty of solutions
 
cat shit said:
Agreed with rocket soul increase temps using led and say goodbye to mg deficiencies its tricky to do in winter but there are plenty of solutions
Click to expand...
I use my t5 fixture and seedling mat for germination but also for extra heat while there young and the led is on a lower percentage works well in colder months and keeps humidity in an acceptable range i find oil heaters make things a bit dry even when iin the lung room.
 

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cat shit said:
Agreed with rocket soul increase temps using led and say goodbye to mg deficiencies its tricky to do in winter but there are plenty of solutions
Click to expand...
One of those solutions is hanging a few low watt incandescant lightbulbs, but you really have to be carefull and balance it wih the rest of the lighting: they can cause a lot of stretch.
@Moflow is an inspiration when it comes to growing with leds in the cold, i think he quote insulating his veg space with foamboard and a little epson, magsulfate in the substrate.
 
Rocket Soul said:
One of those solutions is hanging a few low watt incandescant lightbulbs, but you really have to be carefull and balance it wih the rest of the lighting: they can cause a lot of stretch.
@Moflow is an inspiration when it comes to growing with leds in the cold, i think he quote insulating his veg space with foamboard and a little epson, magsulfate in the substrate.
Click to expand...
Thats sounds very interesting. and the t5 is just for heat as the led is feeding the plants its kind of a waste of resources and power but as long as they are warm the outcome is usually worth it.
 
Dan_J said:
Howdy folks ;)

With all the need for extra cal/mag under LED's i was just wondering if it's because of the spectrum of most LED's or are LED's just super efficient producing more par levels at closer canopy heights due to less heat thus the need to up the PPM's of the complete nutrients not just cal/mag?

thoughts?

cheers
Click to expand...
Yes, id say up total ppms a bit aswell.
 
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