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  Section: Plant Nutrition » Micronutrients » Boron
 
 
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Fractionation of Soil Boron

 
     
 
Content
Historical Information
  Determination of Essentiality
  Functions in Plants
    - Root Elongation and Nucleic Acid Metabolism
    - Protein, Amino Acid, and Nitrate Metabolism
    - Sugar and Starch Metabolism
    - Auxin and Phenol Metabolism
    - Flower Formation and Seed Production
    - Membrane Function
Forms and Sources of Boron in Soils
  Total Boron
  Available Boron
  Fractionation of Soil Boron
  Soil Solution Boron
  Tourmaline
  Hydrated Boron Minerals
Diagnosis of Boron Status in Plants
  Deficiency Symptoms
    - Field and Horticultural Crops
    - Other Crops
  Toxicity Symptoms
    - Field and Horticultural Crops
    - Other Crops
Boron Concentration in Crops
  Plant Part and Growth Stage
  Boron Requirement of Some Crops
Boron Levels in Plants
Soil Testing for Boron
  Sampling of Soils for Analysis
  Extraction of Available Boron
    - Hot-Water-Extractable Boron
    - Boron from Saturated Soil Extracts
    - Other Soil Chemical Extractants
  Determination of Extracted Boron
    - Colorimetric Methods
    - Spectrometric Methods
Factors Affecting Plant Accumulation of Boron
  Soil Factors
    - Soil Acidity, Calcium, and Magnesium
    - Macronutrients, Sulfur, and Zinc
    - Soil Texture
    - Soil Organic Matter
    - Soil Adsorption
    - Soil Salinity
  Other Factors
    - Plant Genotypes
    - Environmental Factors
    - Method of Cultivation and Cropping
    - Irrigation Water
Fertilizers for Boron
  Types of Fertilizers
  Methods and Rates of Application
References

 
Boron fractionation was studied in relation to its availability to corn in 14 soils (49). Up to 0.34% of the total boron was in a water-soluble form, 0 to 0.23% was nonspecifically adsorbed (exchangeable), and 0.05 to 0.30% was specifically adsorbed. Jin et al. (49) reported that most of the boron available to corn was in these three forms, and that boron in noncrystalline and crystalline aluminum and iron oxyhydroxides and in silicates was relatively unavailable for plant uptake. For the identification of different pools of boron in soils, Hou et al. (50) proposed a fractionation scheme, which indicated that readily soluble and specifically adsorbed boron accounted for +2% of the total boron. Various oxides-hydroxides, and organically bound forms constituted 2.3 and 8.6%, respectively. Most soil boron existed in residual or occluded form. Recent studies by Zerrari et al. (51) showed that the residual boron constituted the most important fraction at 78.75%.
 
 


 
     
 
 
     



     
 
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