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Merino wethers forced to graze unsupplemented serrated tussock (Nassella trichotoma (Nees) Hack.) in spring 1961 sustained severe liveweight losses. These weight losses were not significantly reduced by supplementing the serrated tussock with urea, molasses, or urea plus molasses, despite a significant increase in intake on all supplemented treatments. The application of urea significantly increased the apparent crude protein content of the tussock foliage immediately after spraying. After grazing, the apparent crude protein content of the tussock fell to its original level despite two applications of urea, one on the first day and one on the fourth day, each week. Results of this trial, and the practical difficulties of applying urea and molasses, indicate that supplementing serrated tussock in this way would be of little practical importance.

Brimstone, of three different particle size gradings, was compared with finely powdered gypsum in a three year study, on a white clover pasture. Dry matter yield and sulphur recovery were highest ,from gypsum in the first harvest, but brimstone sulphur gave better residual effects. Fineness of grinding influenced the initial availability of brimstone sulphur. The possibility of using particle size gradings to obtain a degree of controlled availability in sulphur fertilizer is discussed in relation to graziers' present and possible future demands. In mixtures of elemental sulphur with soluble sulphate, fertilizers, for example sulphur-fortified superphosphate, a limited amount of delayed release from the elemental sulphur could spread the response over a longer period.