Influence of some fertilizer chemical properties on magnesium resorption from leaf surface of oats
1999
Cigler, P. | Hruby, M. | Kuzel, S.
Eight organic and either inorganic magnesium (Mg) compounds (sulphate, acetate, caproate, laurate, glycine salt, L-valine salt, L-phenylalanine salt, and ethylene-diaminetetraacetic acid magnesium disodium salt) were tested for Mg resorption from the leaf surface of oats (Avena sativa L. cv. Zlat'ak) and for biological availability. The plants were grown on Mg-deficient Hoagland nutrient solution. Significant differences among the alternatives studied were found through one-way ANOVA in all parameters of plants (top and root dry weight, Mg content in tops and roots, chlorophyll a and b content and top height). A very significant decrease of Mg content in plants and aggravation of the plant health status with increasing molar weight value (Mr) of anhydrous compound used in corresponding experimental alternative was observed. The best results were obtained in the case of magnesium sulphate (MgSO(4)(.)7H(2)O) (the lowest Mr value) while the worst were observed in the case of Mg laurate. A different diameter of the biggest particle necessary to be absorbed with Mg (Mg complex molecule/anion, salt anion) resulting in different mobility of this particle in water solution was proposed to be the main reason of this effect. This diameter is closely related to the Mr value of the particular compound in this case. Surprisingly, no effect of fertilizer polarity on Mg penetration was observed. The effect of complex stability of some Mg compounds on Mg penetration was also investigated. The biological availability significantly decreased with the increase of the complex strength.
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