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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
29/07/2025 |
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Autoria: |
BROMFIELD, S. M.; JONES, O. L. |
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Título: |
The effect of sheep on the recycling of phosphorus in hayed-off pastures. |
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Ano de publicação: |
1970 |
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Fonte/Imprenta: |
Australian Journal Agricultural Research, v. 21, n. 5, p. 699-711, 1970. |
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DOI: |
https://doi.org/10.1071/AR9700699 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The mineralization of plant organic phosphorus during digestion by sheep was examined by comparing the intake of inorganic and organic phosphorus from a range of feeds with that excreted in the dung. Up to 80% of the organic phosphorus in spring feed was mineralized but net mineralization did not occur in hayed-off summer feeds. Under field and laboratory conditions inorganic phosphorus leached slowly from intact dung pellets. Laboratory studies showed that in general a larger proportion was leached from summer samples than from either spring or autumn samples. Light crushing increased the rate of leaching in the initial stages. The unleached inorganic phosphorus was completely soluble in dilute acid and slightly soluble in water. The recovery of inorganic phosphorus indicated that mineralization of organic phosphorus had not occurred to any extent within the dung during 6 months' decomposition and leaching. Most of the organic phosphorus resisted leaching and net mineralization but a little was extracted in the first leachate. This stable organic phosphorus was soluble in sodium hydroxide but not in dilute acid. The effects of grazing on the availability of inorganic phosphorus and the accumulation of organic phosphorus in pastures are discussed in the light of these results. |
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Palavras-Chave: |
Nutricao mineral. |
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Thesagro: |
Fósforo; Ovino. |
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Thesaurus Nal: |
Ruminant nutrition; Sheep. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01923naa a2200205 a 4500
001 1522929
005 2025-07-29
008 1970 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1071/AR9700699$2DOI
100 1 $aBROMFIELD, S. M.
245 $aThe effect of sheep on the recycling of phosphorus in hayed-off pastures.$h[electronic resource]
260 $c1970
520 $aAbstract: The mineralization of plant organic phosphorus during digestion by sheep was examined by comparing the intake of inorganic and organic phosphorus from a range of feeds with that excreted in the dung. Up to 80% of the organic phosphorus in spring feed was mineralized but net mineralization did not occur in hayed-off summer feeds. Under field and laboratory conditions inorganic phosphorus leached slowly from intact dung pellets. Laboratory studies showed that in general a larger proportion was leached from summer samples than from either spring or autumn samples. Light crushing increased the rate of leaching in the initial stages. The unleached inorganic phosphorus was completely soluble in dilute acid and slightly soluble in water. The recovery of inorganic phosphorus indicated that mineralization of organic phosphorus had not occurred to any extent within the dung during 6 months' decomposition and leaching. Most of the organic phosphorus resisted leaching and net mineralization but a little was extracted in the first leachate. This stable organic phosphorus was soluble in sodium hydroxide but not in dilute acid. The effects of grazing on the availability of inorganic phosphorus and the accumulation of organic phosphorus in pastures are discussed in the light of these results.
650 $aRuminant nutrition
650 $aSheep
650 $aFósforo
650 $aOvino
653 $aNutricao mineral
700 1 $aJONES, O. L.
773 $tAustralian Journal Agricultural Research$gv. 21, n. 5, p. 699-711, 1970.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
