Mineralogy and agrochemistry of magnesium in soils of Vojvodina, Sumadija and Northern Pomoravlje [Serbia, Serbia&Montenegro]
2001
Kostic, N.M. (University of Belgrade, Belgrade - Zemun (Serbia and Montenegro). Faculty of Agriculture) | Jakovljevic, M.D. | Hadzic, V.B. | Protic, N.J.
This investigation has shown that the investigated soils have the available Mg content between 10 and 93 mg/100g, with an average of 40.8 mg/100 g, and thus could be considered as Mg sufficient for plant production. Available Mg is primarily associated with carbonate fraction (dolomite) and to a lesser extent with exchangeable (clay minerals) and silicate forms (chlorite, mica, amphibole). Total content of Mg varies between 0.20 and 1.26%, with an average of 0.603%. The Ca/Mg ratio has shown a large scale variation between 2.5:1 and 78.8:1. Only 10% of the soils have Ca/Mg ratio lower then 5:1 or optimal ratio for plant nutrition, whilst 90% of the soils were found to have the ratio above 5:1 which, in case of extremely high values, might be a limiting factor in plant growth and might influence an adequate supply of Mg to animals and humans. This investigation has emphasized a necessity of wider reseach in soil mineralogy and chemistry of our soils, which are considered as being sufficient in available magnesium.
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