Published online by Cambridge University Press: 27 March 2009
1. Fractionation studies are reported which show that in young spring pasture of low magnesium content, more than 50% of the magnesium is watersoluble, the proportion being higher in pasture at the seeding stage than in young leafy material.
2. Insoluble magnesium constituted about onethird of the magnesium in young leafy pasture and about one-fifth to one-quarter in pasture at the seeding stage.
3. Acetone-soluble magnesium varied from about 12% of the total in young leafy grass to 5% or less in grass at seeding.
4. Fertilizer treatments, though affecting the total magnesium contents, apparently did not affect the proportions in the different fractions.