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Influence of Soil Fe and MnEDTA Interactions upon the Fe and Mn Nutrition of Bean Plants 1
Author(s) -
Knezek B. D.,
Greinert H.
Publication year - 1971
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1971.00021962006300040031x
Subject(s) - phaseolus , chemistry , chelation , ammonium , manganese , nutrient , muck , ammonium acetate , crop , agronomy , horticulture , environmental chemistry , inorganic chemistry , biology , ecology , high performance liquid chromatography , organic chemistry , chromatography
Several combinations of inorganic and chelated (EDTA) Fe and Mn were added to Mn‐deficient Houghton muck. Navy bean ( Phaseolus vulgaris L.) growth, nutrient uptake, and Fe:Mn ratios were obtained on two successive crops in the greenhouse. Exchangeable Fe and Mn and easily reducible Mn were determined on the soil after the second crop. Addition of MnEDTA or FeEDTA to the soil intensified visual Mn‐deficiency symptoms, reduced growth, and reduced Mn uptake while the Fe concentration remained relatively constant, resulting in a wide Fe:Mn ratio in plants grown in the presence of EDTA. Soil ammonium acetate‐extractable Mn and Fe values indicated that Fe increased by a factor of 20 in the presence of EDTA, while Mn did not change. The ineffectiveness of MnEDTA in overcoming plant Mn deficiency was due to a rapid substitution of Fe for Mn in the EDTA molecule with probable inactivation of the released Mn by complexing with organic matter. Hence, the aggravation of an already critical Fe:Mn ratio in the soil was accomplished, less Mn was taken up by plants, and Mn deficiency was intensified with the use of MnEDTA.