| Registro completo |
| Provedor de dados: |
Chilean J. Agric. Res.
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| País: |
Chile
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| Título: |
Nitrogen, Phosphorus and Potassium Losses in a Grazing System with Different Stocking Rates in a Volcanic Soil
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| Autores: |
Alfaro,Marta
Salazar,Francisco
Iraira,Sergio
Teuber,Nolberto
Villarroel,Dagoberto
Ramírez,Luis
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| Data: |
2008-06-01
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| Ano: |
2008
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| Palavras-chave: |
Eutrofication
Water quality
Grazing
Andisol
Beef production
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| Resumo: |
In Chile there is little information on nutrient losses in livestock systems. The experiment was carried out between 2004 and 2006. Two stocking rates (3.5 and 5.0 steers ha-1) were tested under rotational grazing with Black and White Friesian steers on a permanent pasture (67.5 kg N and 40 kg P ha-1 yr-1). To quantify surface runoff losses (N, P, K), three surface lysimeters (5 x 5 m) per treatment were established. N and K leaching losses were estimated with ceramic cups. Runoff and leachate samples were individually analyzed for available and total N, reactive (RP) and total P, and K. Dissolved organic N (DON) and organic P (OP) were estimated as the difference between total and available forms. The stocking rate did not increase total N, P and K losses (P > 0.05). Losses in surface runoff were < 0.5 kg N, < 0.05 kg P and < 0.6 kg K ha-1 yr-1, respectively, due to the low amount of runoff measured. Nitrogen leaching losses were high (11 up to 71 kg ha-1 yr-1) and K leaching losses were low (3 to 5 kg ha-1 yr-1). Nitrogen in runoff was mainly lost as DON (50%). Nitrogen leaching losses were mainly as nitrate (70%). Phosphorus was lost as RP (70%). Thus, stocking rates of 5.0 steers ha-1 are plausible, but fertilizer application should be avoided in rainfall periods during the year to reduce incidental nutrient losses.
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| Tipo: |
Journal article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200004
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| Editor: |
Instituto de Investigaciones Agropecuarias, INIA
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| Formato: |
text/html
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| Fonte: |
Chilean journal of agricultural research v.68 n.2 2008
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