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  Section: Plant Nutrition » Micronutrients » Molybdenum
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Interactions with Phosphorus and Sulfur

Historical Information
  Determination of Essentiality
  Function in Plants
    - Nitrogenase
    - Nitrate Reductase
    - Xanthine Dehydrogenase
    - Aldehyde Oxidase
    - Sulfite Oxidase
Diagnosis of Molybdenum Status of Plants
  Molybdenum Concentration and Distribution in Plants
  Analytical Techniques for the Determination of Molybdenum in Plants
Assessment of Molybdenum Status of Soils
  Soil Molybdenum Content
  Forms of Molybdenum in Soils
  Interactions with Phosphorus and Sulfur
  Soil Analysis
    - Determination of Total Molybdenum in Soil
    - Determination of Available Molybdenum in Soil
Molybdenum Fertilizers
  Methods of Application
    - Soil Applications
    - Foliar Fertilization
    - Seed Treatment
  Crop Response to Applied Molybdenum

The molybdenum nutrition of plants can be affected by the interaction of molybdenum with other nutrients in the soil such as phosphorus and sulfur. It is well established that plant uptake of molybdenum is enhanced by the presence of soluble phosphorus and decreased by the presence of available sulfur (87). In comparison to MoO42-, phosphate has a greater affinity for sorption sites in soils, such as on sesquioxides (92). Phosphorus fertilization often liberates soil-bound molybdenum into the soil solution and increases molybdenum accumulation by plants (85,97). Phosphorus may also stimulate molybdenum absorption through the formation of a phosphomolybdate complex in soils, which may be readily absorbed by plants (98). The effect of sulfur on molybdenum absorption by plants appears to be related to the direct competition between SO42- and MoO42- during root absorption. Stout and Meagher (99) showed that the addition of SO42- to the culture medium reduced absorption of radioactive molybdenum by tomatoes, and decreased molybdenum absorption by tomatoes (Lycopersicon esculentum Mill.) and peas (Pisum sativum L.) in soil (100).


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