Role of magnesium fertilisers in agriculture: plant–soil continuum
Mehmet Senbayram A C , Andreas Gransee B , Verena Wahle C and Heike Thiel B D
+ Author Affiliations
- Author Affiliations
A Department of Plant Nutrition and Soil Science, University of Harran, SanliUrfa, TR-63000, Turkey.
B K+S KALI GmbH, Bertha-von-Suttner-Straße 7, 34131 Kassel, Germany.
C Institute of Applied Plant Nutrition, University of Goettingen, Carl-Sprengel-Weg 1, 37075 Göttingen, Germany.
D Corresponding author. Email: heike.thiel@k-plus-s.com
Crop and Pasture Science 66(12) 1219-1229 https://doi.org/10.1071/CP15104
Submitted: 26 March 2015 Accepted: 16 September 2015 Published: 21 December 2015
Journal Compilation © CSIRO Publishing 2015 Open Access CC BY-NC-ND
Abstract
In this review, we summarise factors contributing to plant availability of magnesium (Mg) in soils, the role of Mg in plant physiological processes related to yield formation and abiotic stress tolerance, and soil and fertiliser parameters related to Mg leaching in fertilised soils. Mg is a common constituent in many minerals, comprising 2% of Earth’s crust; however, most soil Mg (90–98%) is incorporated in the crystal lattice structure of minerals and thus not directly available for plant uptake. Plants absorb Mg from the soil solution, which is slowly replenished by soil reserves. Duration and intensity of weathering, soil moisture, soil pH, and root–microbial activity in soil are key factors that determine plant-available Mg release from soils. On the other hand, the amount of Mg released from soil minerals is generally small compared with the amounts needed to sustain high crop yield and quality. Thus, in many agro-ecosystems, application of Mg fertilisers is crucial. Magnesium is involved in many physiological and biochemical processes; it is an essential element for plant growth and development and plays a key role in plant defence mechanisms in abiotic stress situations. An early effect of Mg deficiency in plants is the disturbed partitioning of assimilates between roots and shoots because the supply of sink organs with photosynthetic products is impaired, and sugars accumulate in source leaves. Thus, optimal supply of Mg is required to improve crop tolerance to various stresses and to increase yield and quality parameters of harvested products. Unlike other cations, Mg is very mobile in soils because it is less bound to the soil charges. Therefore, Mg losses by leaching might occur in sandy soils with high water conductivity. Leaching of Mg in soils when applied with various water-soluble fertilisers may also vary depending on the fertiliser’s chemical composition, granule size, and effect on soil pH and cation balance, as we discuss in detail.
Additional keywords: antagonism, mineral fertilisers, soil texture, solubility.
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