Phosphorus losses in surface run-off from grazed permanent pastures on a volcanic soil from Chile |
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Authors: | M A Alfaro & F J Salazar |
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Institution: | Remehue Research Centre, National Institute for Agricultural Research, PO Box 24-O, Osorno, Chile |
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Abstract: | Reactive (RP) and organic phosphorus (OP) losses from grazed paddocks were determined on a volcanic soil during 2004 and 2005. Paddocks were grazed by Holstein Friesian steers (3.5 steers ha?1) and received N (67.5 kg ha?1) and P fertilizer (30 kg P ha?1). Total losses ranged between 4 and 15 g P ha?1 year?1 and were greatly affected by incidental P losses associated with spring P fertilizer application. Reactive P constituted 90% of the total losses on average. Due to the high water infiltration capacity of the soil, run‐off was <1% of total drainage, therefore, phosphorus losses in run‐off were small. |
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Keywords: | Andisol grazing reactive P organic P run-off P |
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