Selenium (Se) was applied at two rates (10 and 20 g Se ha−1) to a Se‐deficient pasture and herbage samples were analysed ji‐om six harvests taken over a period of 12 months. Both treatments rapidly raised the Se content of the herbage above the critical value for prevention of dejciency in livestock (30 μg Se kg−1 DM), but without approaching the dangerously high values which might cause toxicity. The herbage Se content declined rapidly after the first harvest with a half‐life of approximately 10 weeks; but even so the herbage treated at the higher rate remained above the critical value for at least nine months. The results indicate that soil application of Se is a realistic option in the treatment of Se‐deficient pastures.
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Rimmer et al. (1990) studied this question.