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  Section: Plant Nutrition » Micronutrients » Iron
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Determination of Essentiality

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

Julius von Sachs, the founder of modern water culture experiments, included iron in his first nutrient cultures in 1860, and Eusèbe Gris, in 1844, showed that iron was essential for curing chlorosis in vines (1,2). Sachs had already shown that iron can be taken up by leaves, and within a few years L. Rissmüller had demonstrated that foliar iron is obviously translocated by phloem out of leaves before leaf fall in European beech (Fagus sylvatica L.). The early developments in the study of iron in plant nutrition were summarized by Molisch in 1892 (3).

It was another 100 years before the principal processes of the mobilization of iron in the rhizosphere started to be understood (4–8).


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