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Sand as a source of calcium?

 
David Chapman
Posts: 36
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I live in Florida and my up and coming food forest is grown mostly in sand. The sand here comes primarily from broken up seashells and some coral. I was thinking the other day, does that mean I have all the calcium in the world that my plants need and can stop crushing these eggshells?

Thanks!
 
Paul Cereghino
gardener
Posts: 855
Location: South Puget Sound, Salish Sea, Cascadia, North America
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Yes, shell contains calcium and many other micronutrients... except calcium availability is low with low pH, which is common because, free calcium and other positively charged nutrients don't stick to sand soils if they are short clay or organic matter due to low cation exchange capacity. So probably no problem with calcium as long as you organic matter/soil food webs are working, would be my guess... but I have absolutely no experience in your kind of system, so if someone else doesn't have a better story, I'd talk to someone like a local extension agent about how those soils behave, and then reinterpret their knowledge in a whole soils framework as necessary.


 
Charles Kelm
Posts: 170
Location: Western Washington (Zone 7B - temperate maritime)
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For calcium I bury pet hair I save from grooming my animals. I put it in the bottom of the hole when planting - works well, especially with tomatoes.
 
Paulo Bessa
pollinator
Posts: 354
Location: Portugal (zone 9) and Iceland (zone 5)
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Charles Kelm wrote:For calcium I bury pet hair I save from grooming my animals. I put it in the bottom of the hole when planting - works well, especially with tomatoes.


I add my own hair, when I cut it.
I also add my own cut nails.
And all those egg shells.
I also add all waste from fruits, citrus included.

These are precious calcium resources I do not want to waste
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