Plant Nutrition

Magnesium Nutrient Info

Magnesium - Quick Facts

  • Magnesium is the central atom of the chlorophyll molecule and is essential for photosynthesis and cell respiration.
  • Magnesium is a mobile nutrient, and it is easily translocated from older tissue to the growing parts of the plants.
  • Magnesium plays a key role in N, P, carbohydrate, oil & energy reactions in the plant.
  • Magnesium is a component of pectin, important for stability of cells and phytin.
  • Form used by plants: Mg+2


Magnesium - Role of Nutrient

  • An activator of more enzymes than any other nutrient, and plays key role in chlorophyll production.
  • Improves utilization and mobility of phosphorus and influences earliness and uniformity of maturity.
  • Essential for synthesis and the transport and storage of important plant substances such as carbohydrates, proteins and fats.
  • Involved in carbohydrate production and transportation.
  • Involved in energy transfer and protein synthesis.


Magnesium - Nutrient in Soil

  • Magnesium is present in some soils as magnesites and dolomites.

Magnesium - Deficiency Symptons

  • Starts with interveinal chlorosis of older leaves
  • Necrosis and red discoloration of stems occur during prolonged periods of deficiency
  • Inadequate Mg will accentuate Phosphate deficiency
  • Leaf curling upwards along margins
  • Dropping foliage
  • Reduced root growth
  • Related to an imbalance of water, the entire plant looks wilted

Magnesium - Factors Affecting Deficiency

  • At pH values >6, magnesium is largely insoluble and therefore unavailable.
  • Soils that are acidic and/or high in organic matter, highly leached soils with low CEC and calcareous soils and typically affected by Magnesium deficiency.
  • Excess levels of other cations such as K, Ca, and N can further restrict Mg availability.
  • Higher amounts of exchangeable Mg than Ca will limit Ca availability.
  • Low soil pH negatively affects the uptake of Mg by the plant.
  • The uptake of Mg by the plant is negatively affected by large K, Mg and Ca, Mg ratios. This means that even at high magnesium concentrations in the soil a latent or even severe deficiency of magnesium in plants is possible.

R3 Agronomic Platform

R3 Lifecycle: Roots > Reproduce > Ripen

Roots – The vegetative stage looks to develop vigorous, healthy roots to maximize nutrient acquisition from the soil. The end result is a healthy root rhizosphere.

Reproduce – Supply the essential nutrients at reproduction to help the plant maximize pollen viability, flowering, pollination, seed set and fruit development.

Ripen – Late season nutrition is vital to optimize the nutrient density and quality of the crop.

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