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Abstract
Plot trials were laid down on Te Kopuru sand, a soil type that grows pasture deficient in copper. Plots were top-dressed at the rates of 0, 5, 10, and 20 lb of copper sulphate/ac. Half of the number of plots receiving each treatment were also top-dressed with ammonium molybdate at the rate of 2 oz/ac.
Results showed that molybdate top-dressing increased molybdenum concentrations in pastures to levels which would be considered dangerous to stock in the absence of copper top-dressing. Copper sulphate top-dressings at the rate of 5 lb/ac/year were sufficient to increase pasture copper concentrations to levels considered satisfactory for stock.
No visible pasture growth response to molybdate was noted.