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  Section: Plant Nutrition » Micronutrients » Iron
 
 
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Soil Testing for Iron

 
     
 
Content
Historical Information
  Determination of Essentiality
Functions in Plants
Forms and Sources of Iron in Soils
Diagnosis of Iron Status in Plants
  Iron Deficiency
  Iron Toxicity
Iron Concentration in Crops
  Plant Part and Growth Stage
  Iron Requirement of Some Crops
  Iron Levels in Plants
    - Iron Uptake
    - Movement of Iron within Plants
Factors Affecting Plant Uptake
  Soil Factors
  Plant Factors
Soil Testing for Iron
Fertilizers for Iron
References

Because of the major impact of soil pH and bicarbonate content on the availability of iron to plants, it is not common to test a soil for iron extractability. Tests of soil pH and lime content are much more valuable in assessing where lime chlorosis is likely to occur.


Where testing of iron content is desired, early methods were based on determining the exchangeable iron by extraction with ammonium acetate (104). Nowadays, soil iron is extracted by the use of a chelating agent, in some cases EDDHA but more commonly DTPA (diethylenetriaminepentacetic acid). This method, first proposed in 1967, is used for the analysis of zinc, iron, manganese, and copper in soils together, and involves adding DPTA to a soil solution buffered at pH 7.3 (105). The mixture contains CaCl2 so that any CaCO3 in the soil is not dissolved, with corresponding release of otherwise unavailable micronutrients.

The micronutrients in the extract are measured by atomic absorption spectrometry, inductively coupled plasma spectrometry, or neutron activation analysis.



 
     
 
 
     



     
 
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