cal mag
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growin-Jables
Well-Known Member
Why isnt cal mag needed when growing in soil?
SoOLED
Well-Known Member
magic!!!!
- high porosity hydro mediums have zero nutrients.
- organic soil/compost fillers are meant to meet nutrient needs for each phase of the cycle. (there are many variants in soil use)
growin-Jables
Well-Known Member
What after 4 weeks once the nutrients are depleted ?
SoOLED
Well-Known Member
I don't use soils or compost, there are people here who have lots of experience working like that.
I bet if you search for threads on soil mixes you will find a lot of data.
growin-Jables
Well-Known Member
7
From what I researched and was informed by the gentlemen at our local hydro store, pre mixed " organic" soils like Fox Farms Ocean Forrest has readily available nutrients that will prevent needing any other added nutes for a duration of 4 weeks. After that, all the nutrients have been absorbed and depleted. So since most plant cycles are anywhere between 10 - 14 weeks. I would say Cal Mag is absolutely necessary once those 4 weeks have expired.
From what I researched and was informed by the gentlemen at our local hydro store, pre mixed " organic" soils like Fox Farms Ocean Forrest has readily available nutrients that will prevent needing any other added nutes for a duration of 4 weeks. After that, all the nutrients have been absorbed and depleted. So since most plant cycles are anywhere between 10 - 14 weeks. I would say Cal Mag is absolutely necessary once those 4 weeks have expired.
TacoMac
Well-Known Member
The layman's answer is: Soil contains and holds nutrients naturally. In fact, there's calcium already in it. When you add the lime, it contains BOATLOADS of calcium and some magnesium that will break down in the soil as you water as time goes by, so the soil will never be short of calcium, so you don't need cal mag. In a worst case scenario, you might have to water once with a half teaspoon of Epson salts to add some magnesium, but that's about it and it rarely happens.
Hydropnic grows have no medium that holds on to any nutrients at all. The roots given only those nutrients that are in the solution. The typical solutions are never going to have enough calcium in them, and magnesium is also iffy. So a cal mag regimine becomes necessary due to the fact that there is always a need for calcium and magnesium over the plants life and the standard nutrients do not contain nearly enough of either.
That's why cal mag was made to begin with. Yes, it's expensive. Hydroponics are very expensive...about 25 times more expensive than soil grows. If you can't afford it, don't do it. It's that simple.
I grow for only my personal use and found that hydroponics simply aren't worth it at all. On a larger scale, yes. It makes a hell of a difference. But if you're only doing two plants for your own use and maybe a friend or two, you're wasting your money even bothering with hydroponics.
papa canna
Well-Known Member
If you are using bagged soil, and TAP WATER it is unlikely that you will ever see calmag deficiency. A lot of people do not understand calmag. They hear about it a lot, so they add it religiously.
But most of the old school experienced guys around here will tell you, not only do you not need it in soil with tap water, but those bottles can do more harm than good if you are not careful
But most of the old school experienced guys around here will tell you, not only do you not need it in soil with tap water, but those bottles can do more harm than good if you are not careful
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