Effect on magnesium oxide responses of particle size and combination with superphosphate

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Abstract
In a glasshouse pot trial on a magnesium-deficient soil comparing various particle sizes of magnesium oxide, highest yields of clover were obtained from the 0.5mm-O.25mm mesh fraction, and there was no advantage from finer grinding. Concentrations of magnesium in the herbage were highest in the first two cuts of clover grown with the most finely ground materials (0.25mm-0.125mm and passed 0.125mm mesh), but in the third cut the herbage Mg concentration from the 0.5 mm-O.25 mm fraction was as high as that from the two finer mesh-size treatments. A second pot trial compared the availability of magnesium applied either as MgO or as a magnesium oxide-reverted superphosphate. There were no significant differences between methods of application judged from total dry matter yields.

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