Sulfur has the power to impact many important processes including stomatal activity, photo assimilate movement, disease resistance and insect infestation, and overall plant growth and yield.

Quick Facts About Sulfur

  • Sulfur is essential for synthesis of Sulfur-containing amino acids and is therefore vital for protein synthesis.
  • Sulfur aids in seed production and producing the chlorophyll necessary for plants to carry out photosynthesis.
  • Sulfur aids in increased Nitrogen use efficiency.
  • Sulfur is a component of vitamin B1 (particularly for cereals and legumes).
  • Important for production of innate plant defence substances (phytoalexines, glutathione).
  • Sulfur fertilization is increasingly common because higher yielding crops are taking up and removing more Sulphur from soil as harvested products.
  • Form used by plants: SO4-2 (Sulphate)
  • Both solution and adsorbed Sulfate are the forms available for plant use.

Role of Sulphur in Plants

  • Improves root growth and seed production.
  • Promotes nodule formation on legumes.
  • Required for synthesis of amino acids and proteins.
  • When used with Nitrogen, Sulfur leads to improved protein & milling quality.
  • Sulfur helps with vigorous plant growth and resistance to cold.
  • Involved in regulating stomatal opening and closing.

Sulfur Deficiencies:

Deficiency Symptoms

  • Yellow-green color, very similar in appearance to Nitrogen deficiency, but is present on the younger leaves.
  • Uniform chlorosis and yellowing on the younger leaves.
  • In canola, a cupping and/or reddish or purple coloration on the underside of the leaves.
  • Typical symptoms in canola are stunted growth, spoon- like arched leaves, pale yellow or white petals and pods can appear bladder-like and bloated.

Factors Affecting Deficiencies

  • Factors that will reduce Sulfur availability to the plant:
    • Leaching of Sulfate
    • Amount and type of soil colloids (higher clay = less availability)
    • Higher pH
    • Lower organic matter in soils
  • It is possible for Sulfur to be temporarily fixed by microbial activity when they incorporate Sulfur into fulvic acid and humic substances.
  • Under anaerobic conditions, the sulfate-ion can be reduced by bacteria to hydrogen sulphide which is unavailable for plants.
  • The risk of Sulfur deficiency is high on lighter soils, especially after heavy rain, on soils with a poor structure and under any conditions which result in a restricted root system.
  • Excess Sulfate reduces Molybdenum uptake.

Sulfur Recommended Products

Product Type Details
Impel Copper
Micronutrient Foliar
Impel Manganese
Micronutrient Foliar
Impel Zinc
Micronutrient Foliar
Laser KS
Macronutrient Foliar

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