Solutions of Zn, Cu and Mn chelates of EDTA, DTPA and EDDHA were reacted separately with a calcareous soil for periods up to 28 days. DTPA was an effective chelate for Zn and Cu; more than 77 and 55% of the added Zn and Cu, respectively, remained soluble after 28 days of reaction with the soil.The stability of Zn‐EDTA and Cu‐EDTA was relatively less than those of the respective DTPA chelates, whereas Zn‐EDDHA and Cu‐EDDHA were highly unstable in the soil. The loss of soluble Mn from Mn‐EDTA, Mn‐DTPA and Mn‐EDDHA additions to soil was very rapid and completed in about one week.
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