%0 Conference Paper
%A Hansen, Sissel
%A Bakken, Anne Kjersti
%D 2008
%E Neuhoff, Daniel
%F orgprints:11946
%I ISOFAR
%K forage, dairy cattle, deficiency, grassland, ruminant, sheep, mineralsip
%P 160-163
%T A discussion of norms for S supply in organic farming based on content in forage and ruminant performance in Norway
%U http://orgprints.org/11946/
%V II
%X The content of sulphur (S) in grassland on 27 Norwegian organic farms with dairy or sheep production was investigated in 2001 and 2002. The forage content of S was below the norms (2 g S kg DM-1) for both plants and animals in a large proportion of the samples. The average S content in forage at dairy farms was 1.4 g S kg DM-1 and at sheep farms 1.5 g. Even on grasslands with low plant S content (<1 g S kg DM-1), S-fertilization did not increase yields and increased the plants’ S content only very slightly. No indications of S deficiency were observed on the dairy farms. For one sheep farm with a forage S content of 1.1 ± 0.1g S kg DM-1, brittle and short winter wool was reported.