1972•Proceedings of the New Zealand Grassland AssociationOpen access
MAGNESIUM DEFICIENCY IN LUCERNE
M. R. J. Toxopeus, K. J. McNaught
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Abstract
An experiment was conducted on lucerne (cv. Wairau), growing on a yellow-brown pumice soil low in magnesium. Under a regime of four harvests annually, small but sign&cant yield responses of 4 and 5% were obtained in the third year to additions of 17 and 34 kg/ha Mg, respectively, when the topsoil (0 to 7.5 cm) Mg value in the control plots had fallen to 2 units (advisory scale). Responses were associated with a concentration of 0.09% Mg in herbage cut ,at the onset of flowering. Foliar symptoms of magnesium deficiency were a chlorosis which increased in severity towards the base of the plant.
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