Abstract
Sheep diets are likely to be deficient in sodium (Na) if pasture contains less than 0.04% Na (lambs and maintenance) or 0.05% Na for ewe flushing and lactation. Herbage from four species was sampled in autumn 2002 from 12 sites on a transect south of the Rakaia River from the coast to 110 km inland. All species had >0.10 % Na near the coast but browntop and cocksfoot declined to < 0.10% Na at 10 km and 20 km inland respectively. White clover and ryegrass declined to about 0.10% Na at 40 km and 80 km respectively. In autumn 2003, soil and herbage samples were collected from 8 farms over a range of distances from the coast. Soil quick test (QT) Na from the 8 farms had a strong negative correlation with distance from the sea. Soil QT Na was
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