Gypsum
- Thread starter Jimmy Verde
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OldMedUser
Well-Known Member
Sure. As long as you don't go overboard with it.
Like dolomitic lime it breaks down slowly in soil and you have to watch what other things you may add that you don't give too much of one substance throwing others out of balance.
A good source of sulfur for your plants especially when they are flowering and helps contribute to resin production. Epsom salts is another good source of S and Mg.
Like dolomitic lime it breaks down slowly in soil and you have to watch what other things you may add that you don't give too much of one substance throwing others out of balance.
A good source of sulfur for your plants especially when they are flowering and helps contribute to resin production. Epsom salts is another good source of S and Mg.
Just as OldMedUser suggested.
Just don't make the mistake of trying to substitute it for lime or, to buffer your soil, it won't. For soil buffering, the calcium has to be in a carbonate form (such as lime), gypsum is in a sulfate form. Great as a Ca and Su source, but lacking buffering ability.
Wet
Just don't make the mistake of trying to substitute it for lime or, to buffer your soil, it won't. For soil buffering, the calcium has to be in a carbonate form (such as lime), gypsum is in a sulfate form. Great as a Ca and Su source, but lacking buffering ability.
Wet
Southerner
Well-Known Member
I noticed a large difference in my smells/tastes after adding gypsum to my ROLS, I wouldn't grow without it now. Great sulfur source like others have said.
Lucky Luke
Well-Known Member
Ive recently stated adding a handful to about 20L of mix. Just a guess amount really.
What amount are others using?
What amount are others using?
Its a fantastic amendment! I love it.
You dont use gypsum for the same purpose as lime. It doesn't alter your ph.
Whats so good about gypsum, is it buffers the soil, so the ph doesn't swing easily at all.
Say you have a soil thats ph 6.5. Well why use lime? The ph is fine.
Gypsum still provides calcium, as well as the benefits of sulphur. But buffers the soil to stay at 6.5. Its fabulous stuff. Really!
Gypsum also breaks up sodic, clay soil.
You dont use gypsum for the same purpose as lime. It doesn't alter your ph.
Whats so good about gypsum, is it buffers the soil, so the ph doesn't swing easily at all.
Say you have a soil thats ph 6.5. Well why use lime? The ph is fine.
Gypsum still provides calcium, as well as the benefits of sulphur. But buffers the soil to stay at 6.5. Its fabulous stuff. Really!
Gypsum also breaks up sodic, clay soil.
Southerner
Well-Known Member
I’ve used at 1cup per 1.5 cu/ft without issues.
NaturalFarmer
Well-Known Member
I have done a few experiments with gypsum and have found that too much in my mix gives a very nasty aftertaste to the smoke.
I ran four mixes in 2 cup increments and only really found awful taste beyond 6 cups of gypsum to 35-45 gallons of soil (45 gallon bags mostly full). 8 cups was almost unsmokeable (I smoked all of it).
2 cups per grow on a large plant should be enough but 4 cups was the sweet spot for my mix.
I ran four mixes in 2 cup increments and only really found awful taste beyond 6 cups of gypsum to 35-45 gallons of soil (45 gallon bags mostly full). 8 cups was almost unsmokeable (I smoked all of it).
2 cups per grow on a large plant should be enough but 4 cups was the sweet spot for my mix.
Miyagismokes
Well-Known Member
You gotta do what you gotta do...
meangreengrowinmachine
Well-Known Member
Definetly adding some gypsum to my mix for next round!
NaturalFarmer
Well-Known Member
There is another thread that I started about gypsum a few years ago or so with a lot of information on gypsum(much more than most would want). I almost hate to link it because it was overrun by bickering and was probably not my best hour but it has a lot of links so here it is.
https://www.rollitup.org/t/gypsum-anyone.930193/
But this video sums it all up
https://www.rollitup.org/t/gypsum-anyone.930193/
But this video sums it all up
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meangreengrowinmachine
Well-Known Member
I need to buy about a ton of this (maybe literally) for my clay soil in my garden too!
Living in red clay country as I do, you can remove the "maybe" from the "(maybe literally)".
Wet
meangreengrowinmachine
Well-Known Member
yeah.... wonder how much that stuff is en masse
meangreengrowinmachine
Well-Known Member
Yeah i watched that. ATM I am trying to see if I can keep adding some organic compost and working it together with the clay but I think the gypsom will help a lot. I will have to look into this I am sure my local feed store or rock place will have a lot.
NaturalFarmer
Well-Known Member
Another source calcium carbonate input is hardwood ash which also gives up a good amount of K as well. I use ash from my fireplace along with crab shell as my carbonates in conjunction with gypsum.
NaturalFarmer
Well-Known Member
200+ years ago Benjamin Franklin experimented with gypsum and it was said that he wrote "Land Plaster Used Here" in gypsum on his hillside field near Philly so that everyone could see the benefits in the greener clover. This anecdote is still used in the Benjamin Franklin trademark brand agri gypsum which I believe is the #1 seller. Just another future Jeopardy question.
https://news.google.com/newspapers?...YtGAAAAIBAJ&sjid=POkMAAAAIBAJ&pg=4489,3794375
https://news.google.com/newspapers?...YtGAAAAIBAJ&sjid=POkMAAAAIBAJ&pg=4489,3794375
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