Manganese Movement from Fertilizer Granules in Various Soils1
- J. J. Mortvedt and
- P. M. Giordano2
Movement of Mn in acid Hartsells fsl (pH 5.1) from fertilizer granules containing 2% Mn as 54Mn-labeled MnSO4 was in the order: KCl = NH4NO3 [AN] > soil (no carrier) = concentrated superphosphate [CSP] = NH4H2PO4 [MAP] ≫ (NH4)2HPO4 [DAP] = (NH4)3HP2O7 [TPP] = ammonium polyphosphate [APP]. In limed Hartsells soil (pH 7.6) Mn movement was less from granules of all fertilizers, but the order remained the same.
Movement of Mn applied in soil or MAP granules was greater in Spencer sil (pH 4.7) than in five other soils with higher pH levels. Application of Mn with MAP resulted in decreased Mn movement in all soils except Houghton muck. Little or no movement of Mn occurred when MnSO4 was applied with TPP to any of these soils. Reduced movement may have been due to formation of reaction products of low solubility which reduced the concentration gradient of soluble Mn in the soil near the granule site.
Percentage recoveries of applied Mn from the soil immediately adjacent to the granule sites by H2O, neutral 1N NH4OAc, and neutral 1N NH4OAc containing 0.2% hydroquinone showed little difference for Mn applied alone or with granular AN, KCl, CSP, or MAP. However, the recoveries of Mn applied with DAP, APP, and TPP were lower, indicating lower solubility of Mn applied with these fertilizers. Recoveries of applied Mn also were less in soils with higher pH levels.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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