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Abstract
After ending topdressing with magnesium fertilisers on a field trial on a magnesium-deficient yellow-brown pumice soil, residual effects of six of the fertilisers were compared with effects found from continued annual applications of kieserite. Compared with the regularly topdressed kieserite, all treatments showed a decline in dry matter yields, concentrations of magnesium in the herbage, and magnesium uptakes. Residual effects were smaller from serpentine superphosphate and magnesium phosphate than from dolomite treatments. Over a 6-year period, the percentage of applied magnesium recovered in herbage and soil ranged from 29 to 61 percent, suggesting high losses by leaching from the added magnesium.