Abstract
SUMMARY At six stages during the grazing season herbage samples from four plots, which had received various fertilizer treatments, namely high potash, high nitrogen, high nitrogen plus potash or no treatment, were analysed for Mn, Cu, Mo, I, Co, Zn and Fe. Nitrogen fertilizer alone or with potash depressed herbage Mn and I but increased herbage Cu and Zn. Potash alone depressed Mo content of the grass. Co and Fe were not affected by fertilizer treatments. These effects were sufficiently severe as to suggest that animals grazing this pasture might suffer trace element deficiency.
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