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[IBC] CEC
I had the words wrong but the description I gave was fairly close. I didn't
copy the paragraph that talks about too high a CEC that salts build up and cause their own serious problems. I believe this happened in some Southwestern farm lands. Check out http://edis.ifas.ufl.edu/CN004 The essential paragraph. Cation Exchange Capacity The ability of a soil or growth medium to retain nutrients against leaching by irrigation water or rainfall is estimated by measuring the cation exchange capacity (CEC). Most adsorption sites on growth medium particles are negatively charged and attract positively-charged ions. Many nutrients required by plants are positively charged and thus are attracted by these negatively-charged sites. Sands and other low-surface area materials have low cation exchange capacities while organic components have a greater ability to retain cations. Pine bark has a cation exchange capacity in the range of 10 to 13 milliequivalents per 100 cubic centimeters while a CEC of approximately 1 is common for builders' sand. Billy on the Florida Space Coast BSF Annual Convention May 28 - 31, 2004 Radisson Hotel, Cape Canaveral, Florida Sponsored by The Bonsai Society of Brevard and the Treasure Coast Bonsai Society http://www.bonsaisocietyofbrevard.org/2004/2004.html ************************************************** ****************************** ++++Sponsored, in part, by John Quinn++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
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