Abstract
Abstract The quantities of nitrogen (N), phosphorus (P), calcium (Ca) , magnesium (Mg) , sodium (Na) , potassium (K), total solids (TS) , and organic matter (OM) moving downslope at the surface of hill pasture during rain events were estimated for one year. About 60–80% of the year's totals of the nitrate N, Ca, Mg, Na, TS, and OM, and about 30–50% of the Kjeldahl N, total P, and K moved downslope in winter during 3 overland flow events accounting for about 75% of the year's water runoff. The remainder of nutrients moved downslope in rain events with no observed overland flow. About 45% of the year's total of Kjeldahl N and about 30% of the K moved downslope in rain events after grazing. About 34% of the year's total P movement took place in 2 rain events after superphosphate application to recently grazed pasture, but under these conditions only about 0.2% of the year's total moved in topdressed pasture with long grass. Postgrazing and post-fertiliser events accounted for less than 4% of the year's downs...
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