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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
05/09/1996 |
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Data da última atualização: |
05/09/1996 |
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Autoria: |
BLUE, W. G. |
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Afiliação: |
Department of Soils, Florida Agricultural Experiment Station, Gainesvile. |
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Título: |
The effect of lime on retention of fertilizer phosphorus in Leon fine sand. |
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Ano de publicação: |
1970 |
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Fonte/Imprenta: |
Proceedings Soil and Crop Science Society of Florida, v.30, p.140-173, 1970. |
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Idioma: |
Inglês |
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Conteúdo: |
The effect of lime on P retention in Leon fine sand, an acid, flatwoods soil from the Beef Research Unit near Gainesville was studied. A laboratory leaching technique was used to determine retention. The relationship between Ca levels and P retained was linear from pH 4.6 of the virgin soil to pH 7.5 where 2,000 ppm Ca from CaCO3 were applied. Phosphorus retention was also increased by soil-P reaction time up to 30 days. The effect of Ca (OH)2 on P retention was essentially identical to that of CaCO3, which seemed to eliminate adsorption on CaCO3 particles as the mechanism for increased retention. Fractionation of P forms by the Chang-Jackson procedure showed little differentiation in P forms among soil Ca levels. The dominant form was Al-P. There was little Ca-P at any Ga level. However, it was shown that both 1 N NH4CI and 0.5 N NH4F (pH 8.2) dissolved substantial quantities of P from Ca3 (PO4)2. Maximum P retention was shown to vary depending on the method used. Between 3 and 29% of a 100-ppm P application was extracted by NH4OAc-(pH 4.8) at Ca levels from 0 to 1,000 ppm. Extractable P appeared to increase more rapidly above pH 6.5 but differences were small. Soil-P reaction time did not alter amounts of P extracted by NH4OAc (pH 4.8). Maximum P retention of horizons in a typical Leon fine sand profile which had been repeatedly fertilized during 18 years in pasture was low in the surface soil but increased from the spodic horizon downwards. Total retention of P in the profile to a depth of 183 cm exceeded 11,000 kg/ha. MenosThe effect of lime on P retention in Leon fine sand, an acid, flatwoods soil from the Beef Research Unit near Gainesville was studied. A laboratory leaching technique was used to determine retention. The relationship between Ca levels and P retained was linear from pH 4.6 of the virgin soil to pH 7.5 where 2,000 ppm Ca from CaCO3 were applied. Phosphorus retention was also increased by soil-P reaction time up to 30 days. The effect of Ca (OH)2 on P retention was essentially identical to that of CaCO3, which seemed to eliminate adsorption on CaCO3 particles as the mechanism for increased retention. Fractionation of P forms by the Chang-Jackson procedure showed little differentiation in P forms among soil Ca levels. The dominant form was Al-P. There was little Ca-P at any Ga level. However, it was shown that both 1 N NH4CI and 0.5 N NH4F (pH 8.2) dissolved substantial quantities of P from Ca3 (PO4)2. Maximum P retention was shown to vary depending on the method used. Between 3 and 29% of a 100-ppm P application was extracted by NH4OAc-(pH 4.8) at Ca levels from 0 to 1,000 ppm. Extractable P appeared to increase more rapidly above pH 6.5 but differences were small. Soil-P reaction time did not alter amounts of P extracted by NH4OAc (pH 4.8). Maximum P retention of horizons in a typical Leon fine sand profile which had been repeatedly fertilized during 18 years in pasture was low in the surface soil but increased from the spodic horizon downwards. Total retention of P in the pro... Mostrar Tudo |
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Palavras-Chave: |
Capacidade de retencao; Extractable; Retention capacity; Soil profile. |
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Thesagro: |
Fertilidade; Fósforo; Perfil do Solo. |
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Thesaurus Nal: |
ammonium acetate; phosphorus. |
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Categoria do assunto: |
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Marc: |
LEADER 02195naa a2200229 a 4500
001 1789611
005 1996-09-05
008 1970 bl --- 0-- u #d
100 1 $aBLUE, W. G.
245 $aThe effect of lime on retention of fertilizer phosphorus in Leon fine sand.
260 $c1970
520 $aThe effect of lime on P retention in Leon fine sand, an acid, flatwoods soil from the Beef Research Unit near Gainesville was studied. A laboratory leaching technique was used to determine retention. The relationship between Ca levels and P retained was linear from pH 4.6 of the virgin soil to pH 7.5 where 2,000 ppm Ca from CaCO3 were applied. Phosphorus retention was also increased by soil-P reaction time up to 30 days. The effect of Ca (OH)2 on P retention was essentially identical to that of CaCO3, which seemed to eliminate adsorption on CaCO3 particles as the mechanism for increased retention. Fractionation of P forms by the Chang-Jackson procedure showed little differentiation in P forms among soil Ca levels. The dominant form was Al-P. There was little Ca-P at any Ga level. However, it was shown that both 1 N NH4CI and 0.5 N NH4F (pH 8.2) dissolved substantial quantities of P from Ca3 (PO4)2. Maximum P retention was shown to vary depending on the method used. Between 3 and 29% of a 100-ppm P application was extracted by NH4OAc-(pH 4.8) at Ca levels from 0 to 1,000 ppm. Extractable P appeared to increase more rapidly above pH 6.5 but differences were small. Soil-P reaction time did not alter amounts of P extracted by NH4OAc (pH 4.8). Maximum P retention of horizons in a typical Leon fine sand profile which had been repeatedly fertilized during 18 years in pasture was low in the surface soil but increased from the spodic horizon downwards. Total retention of P in the profile to a depth of 183 cm exceeded 11,000 kg/ha.
650 $aammonium acetate
650 $aphosphorus
650 $aFertilidade
650 $aFósforo
650 $aPerfil do Solo
653 $aCapacidade de retencao
653 $aExtractable
653 $aRetention capacity
653 $aSoil profile
773 $tProceedings Soil and Crop Science Society of Florida$gv.30, p.140-173, 1970.
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Registro original: |
Embrapa Pantanal (CPAP) |
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