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| Borie,F.; Rubio,R.. |
| This paper reviews the literature related to total and organic P (Po) levels present in both agricultural and forest soils from southern Chile. Different reports have demonstrated the high contents of total P (Pt) found in agricultural soils (1,000-3,000 mg kg-1) even in unfertilized soils. In most soils Po represents more than 50% of Pt, mainly as inositol penta- and hexaphosphates linked to Fe and/or Al. Lipid-P has been found in very small quantities suggesting very fast cycling. When phosphate fertilizers are applied to these soils, the bulk of P is accumulated as macromolecular-P complexes closely associated with soil organic matter. Close relationships have been found between organic C and Po and between Po and P associated with humic acids (HA-P).... |
| Tipo: Journal article |
Palavras-chave: Agricultural and forest soils; Organic phosphorus; P availability; Total phosphorus; Volcanic soils. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100011 |
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| Schmitt,Djalma Eugênio; Gatiboni,Luciano Colpo; Heidemann,Joice Crescêncio; Dall’Orsoletta,Daniel João; Boitt,Gustavo; Brunetto,Gustavo. |
| Abstract: The objective of this work was to evaluate changes in phosphorus fractions in a Humic Cambisol cultivated with vineyards, after 62 years of additional fertilization with poultry litter. Soil samples were collected from two vineyards (V1 and V2) and a forested area adjacent to them. A total of 1,365 and 910 kg ha-1 P were applied to V1 and V2, respectively, throughout the past 62 years. Samples were collected at 0-10, 10-20, 20-30, and 30-40-cm soil depths for the analysis of soil physicochemical properties. The addition of poultry litter to the soil of the vineyards increased the contents of inorganic P (Pi) in all fractions, except in the residual fraction (residual-P), mainly at the 0-10-cm soil depth, in comparison with the forested area. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis labrusca; Chemical fractionation of P; Grapevine; Organic phosphorus; Organic residue. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000103805 |
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| Souza,César Roriz de; Ghosh,Amlan Kumar; Silva,Ivo Ribeiro da; Alvarenga,Elson Santiago de; Novais,Roberto Ferreira; Jesus,Guilherme Luiz de. |
| Large quantities of poultry litter are being produced in Brazil, which contain appreciable amounts of phosphorus (P) that could be of environmental concern. To assess the immediate environmental threat, five poultry litters composed of diverse bedding material were incubated for 43 days under greenhouse conditions. The litters consisted of: coffee bean husk (CH); wood chips (WC); rice husk (RH); ground corn cobs (CC) and ground napier grass (NG) (Pennisetum purpureum Schum.), in which the change in forms of soluble P was evaluated using 31P NMR spectroscopy. On average, 80.2 and 19.8 % of the total P in the extract, respectively, accounted for the inorganic and organic forms before incubation and 48 % of the organic P was mineralized to inorganic P in 43... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pyrophosphates; Organic phosphorus; Phosphorus fractionation; Bedding material. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000500016 |
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| Gatiboni,Luciano Colpo; Brunetto,Gustavo; Rheinheimer,Danilo dos Santos; Kaminski,João; Pandolfo,Carla Maria; Veiga,Milton; Flores,Alex Fabiani Claro; Lima,Maria Angélica Silveira; Girotto,Eduardo; Copetti,André Carlos Cruz. |
| Long-standing applications of mineral fertilizers or types of organic wastes such as manure can cause phosphorus (P) accumulation and changes in the accumulated P forms in the soil. The objective of this research was to evaluate the forms of P accumulated in soils treated with mineral fertilizer or different types of manure in a long-term experiment. Soil was sampled from the 0-5 cm layer of plots fertilized with five different nutrient sources for nine years: 1) control without fertilizer; 2) mineral fertilizer at recommended rates for local conditions; 3) 5 t ha-1 year-1 of moist poultry litter; 4) 60 m³ ha-1 year-1 of liquid cattle manure and 5) 40 m³ ha-1 year-1 of liquid swine manure. The 31P-NMR spectra of soil extracts detected the following P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycerophosphate; Manure; Phytate; Organic phosphorus; Organic fertilization. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000300010 |
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| Farias,Samuel Christian Cohen; Silva Júnior,Mário Lopes da; Ruivo,Maria de Lourdes Pinheiro; Rodrigues,Possidônio Guimarães; Melo,Vânia Silva de; Costa,Adriane da Rocha; Souza Júnior,João Cardoso de. |
| ABSTRACT The use of fire to prepare agricultural areas is a technique still used by small farmers in eastern Amazon. This type of management changes the dynamics of soil nutrients, especially phosphorus, which constitutes the most limiting nutrient for crop production in tropical soils. This study was carried out to evaluate changes in phosphorus forms in an Argissolo Amarelo Distrófico (Ultisol) submitted to burning and trituration of secondary forest in eastern Amazon. The evaluated systems were: slash-and-burn of vegetation; slash-and-mulch of vegetation; and secondary vegetation. The labile, moderately labile, moderately recalcitrant, available and total phosphorus fractions were assessed at the soil depths of 0.00-0.05, 0.05-0.10 and 0.10-0.20 m. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Shifting cultivation; Tropical soils; Phosphorus fractions; Organic phosphorus. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100506 |
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| Tiecher,Tales; Tiecher,Tadeu Luis; Mallmann,Fábio Joel Kochem; Zafar,Mohsin; Ceretta,Carlos Alberto; Lourenzi,Cledimar Rogério; Brunetto,Gustavo; Gatiboni,Luciano Colpo; Santos,Danilo Rheinheimer dos. |
| ABSTRACT In Southern Brazil, agricultural soils are often treated over long periods with annual pig slurry (PS) applications, and their influence on soil nutrient dynamics should be monitored. This study aimed to evaluate the P forms accumulated in the soil and some biological and biochemical parameters of the P cycle after 19 successive PS applications over eight years, in a no-tillage (NT) system. Pig slurry was applied at rates of 0, 20, 40, and 80 m3 ha-1 per crop. Several P forms (available P, microbial P, phosphatase enzyme, total organic and inorganic P) in the 0.00-0.05 and 0.05-0.10 m soil layers were analyzed. Increases up to 5,523 % in available P, 308 % in microbial P, 104 % in phosphatase enzyme activity, 91 % in organic P, 251 % in inorganic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic phosphorus; Inorganic phosphorus; Microbial biomass phosphorus; Acid phosphatase. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100428 |
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| Galvão,Sandra Regina da Silva; Salcedo,Ignacio Hernan. |
| Phosphorus fractions were determined in soil samples from areas fertilized or not with farmyard cattle manure (FYM) and in samples of FYM used in the semi-arid region of Paraiba state, Brazil. Soil samples were taken from the 0-20; 20-40 and 40-60 cm layers of 18 cultivated areas, which, according to interviews with farmers, had been treated with 12 to 20 t ha-1 FYM annually, for the past 2 to 40 years. Soil samples were also collected from four unfertilized pasture areas as controls. Phosphorus in the soil samples was sequentially extracted with water (Pw), resin (Pres), NaHCO3 (Pi bic and Po bic), NaOH (Pi hid and Po hid), H2SO4 (Pacid) and, finally, by digestion with H2SO4/H2O2 (Presd). Nine FYM samples were extracted with water, resin, Mehlich-1,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic phosphorus; Water soluble phosphorus; Phosphorus leaching. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000300014 |
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