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  Section: Plant Nutrient » Essential Elements - Macronutrients
 
 
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Essential Elements - Macronutrients

 
     
 
Macroelements in plant nutrition:
Nitrogen
Phosphorus
Potassium
Calcium
Magnesium
Sulfur (Sulphur)




Topics covered in Macroelement Nitrogen
Determination of Essentiality
Nitrogen Metabolism and Nitrogenous Constituents in Plants
  Nitrate Assimilation
    - Nitrate Reductase
    - Nitrite Reductase
  Ammonium Assimilation
    - Glutamine Synthetase
    - Glutamate Synthase
    - Glutamic Acid Dehydrogenase
    - Transamination
    - Amidation
  Proteins and Other Nitrogenous Compounds
Diagnosis of Nitrogen Status in Plants
  Symptoms of Deficiency and Excess
  Concentrations of Nitrogen in Plants
    - Concentrations of Nitrogen in Plant Parts
    - Ratios of Concentrations of Nitrogen to Other Nutrients in Plants
Nitrogen in Soils
  Forms of Nitrogen in Soils
    - Organic Nitrogen in Soil
    - Inorganic Nitrogen in Soil
Soil Testing for Nitrogen
  Determinations of Total Nitrogen
  Biological Determinations of Availability Indexes
    - Determination of Inorganic Nitrogen
      - Ammonium
      - Nitrate
      - Amino Sugars
Nitrogen Fertilizers
  Properties and Use of Nitrogen Fertilizers
    - Anhydrous Ammonia (82% N)
    - Aqua Ammonia (21% N)
    - Urea (46% N)
    - Ammonium Nitrate (34% N)
    - Ammonium Sulfate (21% N)
    - Nitrogen Solutions (28–32% N)
    - Ammonium Phosphates (10–21% N)
    - Other Inorganic Nitrogen Fertilizers
    - Organic Nitrogen Fertilizers (0.2–15% N)
References

 




Topics covered in Macroelement Phosphorus
Introduction
  Historical Information
  Phosphorus Functions in Plants
  Nature and Transformations of Soil Phosphorus
Diagnosing Phosphorus Deficiency
  Visual Symptoms of Deficiency and Excess
  Tissue Testing for Phosphorus
  Soil Testing for Phosphorus
Factors Affecting Management of Phosphorus Fertilization
  Crop Response to Phosphorus
  Soil Water
  Soil Temperature
  Sources of Phosphorus
  Timing of Application of Phosphorus Fertilizers
  Placement of Phosphorus Fertilizers
  Foliar-Applied Phosphorus Fertilization
  Fertilization in Irrigation Water
References





Topics covered in Macroelement Potassium
Historical Information
Determination of Essentiality
  Function in Plants
    - Enzyme Activation
    - Protein Synthesis
    - Ion Absorption and Transport
      » Potassium Absorption
      » Potassium Transport within Tissues
      » Osmotic Function
    - Photosynthesis and Respiration
    - Long-Distance Transport
Diagnosis of Potassium Status in Plants
  Symptoms of Deficiency
  Symptoms of Excess
Concentrations of Potassium in Plants
Assessment of Potassium Status in Soils
  Potassium-Bearing Minerals
  Potassium Fractions in Soils
  Plant-Available Potassium
  Soil Tests for Potassium Fertilizer Recommendations
Potassium Fertilizers
  Kinds of Fertilizers
  Application of Potassium Fertilizers
References

 




Topics covered in Macroelement Calcium
Historical Information
  Determination of Essentiality
Functions in Plants
  Effects on Membranes
  Role in Cell Walls
  Effects on Enzymes
  Interactions with Phytohormones
  Other Effects
Diagnosis of Calcium Status in Plants
  Symptoms of Deficiency and Excess
  Concentrations of Calcium in Plants
    - Forms of Calcium Compounds
    - Distribution of Calcium in Plants
    - Calcicole and Calcifuge Species
    - Critical Concentrations of Calcium
    - Tabulated Data of Concentrations by Crops
Assessment of Calcium Status in Soils
  Forms of Calcium in Soil
  Soil Tests
  Tabulated Data on Calcium Contents in Soils
Fertilizers for Calcium
  Kinds of Fertilizer
  Application of Calcium Fertilizers
References





Topics covered in Macroelement Magnesium
Historical Information
  Determination of Essentiality
Function in Plants
  Metabolic Processes
  Growth
  Fruit Yield and Quality
Diagnosis of Magnesium Status in Plants
  Symptoms of Deficiency and Excess
    - Symptoms of Deficiency
    - Symptoms of Excess
  Environmental Causes of Deficiency Symptoms
  Nutrient Imbalances and Symptoms of Deficiency
    - Potassium and Magnesium
    - Calcium and Magnesium
    - Nitrogen and Magnesium
    - Sodium and Magnesium
    - Iron and Magnesium
    - Manganese and Magnesium
    - Zinc and Magnesium
    - Phosphorus and Magnesium
    - Copper and Magnesium
    - Chloride and Magnesium
    - Aluminum and Magnesium
  Phenotypic Differences in Accumulation
  Genotypic Differences in Accumulation
Concentrations of Magnesium in Plants
  Magnesium Constituents
    - Distribution in Plants
    - Seasonal Variations
    - Physiological Aspects of Magnesium Allocation
  Critical Concentrations
    - Tissue Magnesium Concentration Associations with Crop Yields
    - Tabulated Data of Concentrations by Crops
Assessment of Magnesium in Soils
  Forms of Magnesium in Soils
  Sodium Absorption Ratio
  Soil Tests
  Tabulated Data on Magnesium Contents in Soils
    - Soil Types
Fertilizers for Magnesium
  Kinds of Fertilizers
  Effects of Fertilizers on Plant Growth
  Application of Fertilizers
References





Topics covered in Macroelement Sulfur (Sulphur)
Introduction
Sulfur in Plant Physiology
  Uptake, Transport, and Assimilation of Sulfate
    - Foliar Uptake and Metabolism of Sulfurous Gases
  Major Organic Sulfur Compounds
  Secondary Sulfur Compounds
  Interactions between Sulfur and Other Minerals
    - Nitrogen–Sulfur Interactions
    - Interactions between Sulfur and Micronutrients
Sulfur in Plant Nutrition
  Diagnosis of Sulfur Nutritional Status
    - Symptomatology of Single Plants
    - Symptomatology of Monocots
    - Sulfur Deficiency Symptoms on a Field Scale
Soil Analysis
Plant Analysis
  Analytical Methods
  Assessment of Critical Nutrient Values
  Sulfur Status and Plant Health
Sulfur Fertilization
References



 
     
 
 
     




     
 
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