Plant nutrients are usually categorized as primary, secondary, or trace nutrients. Calcium is secondary macronutrient. Secondary macronutrients are Ca, Mg, and S. Primary macronutrients are N,P, and K, and C,O, and H. Trace nutrients are metals and Cl.<quoted text>
rabbee: excuse me? the ph, of distilled water is 7. anything above ph 7 to 14 is alkaline, anything below it to 0 is acidic. and most plants, do not use calcium. when you burn plants, you end up with mostly potash left. and most plants, other than saline aquatic plants cannot tolerate chlorides. and even salt water plants, cannot grow in the great salt lake, or the dead sea.
I never said pH 7 was an ACID, what I said was that pH 7 was more ACIDIC than pH 8, and that most natural non desert soils are more acidic than that.
Calcium availability to plants is diminished as acidity increase I.E. less is available at pH 7.1 than at 7.5.
Maximum availability is at 7.5 and above.
See the diagram at http://www.firstrays.com/PDF/Part%201%20-%20U...