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nafex - [NAFEX] Saving over-fertilized plants

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  • From: "Jim Fruth" <jimfruth@charter.net>
  • To: "NAFEX" <nafex@lists.ibiblio.org>
  • Subject: [NAFEX] Saving over-fertilized plants
  • Date: Wed, 3 Feb 2010 10:29:19 -0600

Mark Wessel asked, "I understand leaching out excess fertilizer with large amounts of water. However I am not sure how gypsum plays a role in this process. Could you explain."


Water alone would likely not remove fertilizers from over-fertilized plants. This explanation will be over-simplified: As it was explained back in my soils class, soil particles and organic matter possess positive and negetative polarity/sites that form a weak chemical bond with the cations and anions of fertilizer. Many of the cations of fertilizer have a valence (charge) of +1 and the calcium in Gypsum, with its valence/charge of +2, displaces the 1's and bonds to the site itself. Does that make sense?

Jim Fruth
Brambleberry Farm
Pequot Lakes, MN 56472
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