Determination of Orthophosphate in Aqueous Solutions Containing Labile Organic and Inorganic Phosphorus Compounds

Dick, Warren A.; Tabatabai, M. A.

doi:10.2134/jeq1977.00472425000600010018x

Cited by 273 publications

(176 citation statements)

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“…Inorganic P of the alkaline extracts of NaHCO 3 and NaOH was determined by the method proposed by Dick & Tabatabai (1977). In these alkaline extracts, total P was determined by digestion with ammonium persulfate + sulfuric acid in an autoclave.…”

Section: Soil Collection and Analysis Of Soil Properties And P Chemicmentioning

confidence: 99%

Phosphorus fractions in sandy soils of vineyards in southern Brazil

Schmitt

Comin

Gatiboni

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYPhosphorus (P) applications to vineyards can cause P accumulation in the soil and maximize pollution risks. This study was carried out to quantify the accumulation of P fractions in sandy soils of vineyards in southern Brazil. Soil samples (layers 0-5, 6-10 and 11-20 cm) were collected from a native grassland area and two vineyards, after 14 years (vineyard 1) and 30 years (vineyard 2) of cultivation, in Santana do Livramento, southern Brazil, and subjected to chemical fractionation of P. Phosphorus application, especially to the 30-year-old vineyard 2, increased the inorganic P content down to a depth of 20 cm, mainly in the labile fractions extracted by anion-exchange resin and NaHCO 3 , in the moderately labile fraction extracted by 0.1 and 0.5 mol L -1 NaOH, and in the non-labile fraction extracted by 1 mol L -1 HCl, indicating the possibility of water eutrophication. Phosphorus application and grapevine cultivation time increased the P content

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Section: Soil Collection and Analysis Of Soil Properties And P Chemicmentioning

confidence: 99%

Phosphorus fractions in sandy soils of vineyards in southern Brazil

Schmitt

Comin

Gatiboni

et al. 2013

Rev. Bras. Ciênc. Solo

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“…After the extractions, the remaining soil was oven-dried and subjected to digestion with H 2 SO 4 + H 2 O 2 + MgCl 2 (Residual-P). The Pi contained in the alkaline extracts NaHCO 3 and NaOH was determined by the spectrophotometric method proposed by DICK & TABATABAI (1977). In these alkaline extracts, total P was determined after digestion with ammonium persulfate + sulfuric acid in an autoclave (USEPA, 1971), and Po was computed as the difference between total P and Pi.…”

Section: Methodsmentioning

confidence: 99%

Phosphorus fractions in soil after successive crops of Pinus taeda L. without fertilization

et al. 2017

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Pinus cultivation without fertilization is a common practice in southern Brazil, which can induce a decline in the availability of phosphorus (P) in the soil. The purpose of this study was to evaluate the changes in phosphorus fractions in a Humic Cambisol subjected to continuous Pinus taeda L. cultivation without fertilization. Two forest stands were evaluated, after 16 years of Pinus cultivation (1st crop) and 49 years (3rd crop), when soil samples were collected (layers 0-10, 10-20, 20-40, 40-60, and 60-80cm) from six trenches per forest. In soil samples, the P contained in organic (Po) and inorganic (Pi) forms was determined by sequential chemical fractionation. Labile inorganic P fractions remained unchanged after the different cultivation periods. However, the labile organic fractions declined from the first to the third cycle (from 70.6 to 39.8mg dm-3 in the 0-10cm layer), indicating that these forms influence the buffering capacity of labile Pi. The moderately labile organic P acted as a P drain, increasing its percentage of the total, from 34.7 to 56.3%, from the first to the third crop. Soil cultivation for 49 years with Pinus taeda resulted in a reduction of the organic P content, indicating that for this soil use, this P form should be used to diagnose P availability and fertilization requirements.

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“…O P inorgânico extraído pela resina foi determinado conforme a metodologia de Murphy & Riley (1962). Determinou-se, no extrato alcalino (NaHCO 3 ), o P inorgânico, pelo método de Dick & Tabatabai (1977) e o P total por digestão com persulfato de amônio mais ácido sulfúrico em autoclave (USEPA, 1971). O P orgânico deste extrato resultou da diferença entre P total e P inorgânico extraído por bicarbonato.…”

Section: Methodsunclassified

Análise ambiental do uso de fontes de nutrientes associadas a sistemas de manejo do solo

Pandolfo

Ceretta

Massignam

et al. 2008

Rev. bras. eng. agríc. ambient.

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R ESU MOOs modelos matemáticos de análises são ferramentas integradoras que podem contribuir para uma avaliação mais eficaz do potencial poluente de dejetos quando dispostos no ambiente. Utilizou-se, para avaliar os impactos do uso de fontes de nutrientes, um experimento conduzido durante nove anos, em um Nitossolo Vermelho Distrófico, com uma combinação de aplicação de cinco fontes de nutrientes (três fontes orgânicas, uma mineral e uma testemunha) associadas a cinco sistemas de manejo do solo, com delineamento em blocos subdivididos e três repetições. Os atributos utilizados foram os teores no solo de Zn e Cu disponíveis, formas lábeis de P, índice de diversidade da mesofauna edáfica, teores de carbono e nitrogênio no solo, além de dois questionários de opinião sobre o impacto ambiental do uso dos dejetos e dos sistemas de manejo do solo. Na avaliação se usou um modelo cujas saídas, para cada fonte de nutriente dentro de cada sistema de manejo do solo, foram figuras triangulares e a área das mesmas, com intervalo de confiança a nível de 90%. As fontes orgânicas exerceram efeitos diferenciados quanto ao aspecto ambiental, em que o dejeto líquido de suínos apresentou o pior desempenho. O índice de risco, dentre os três índices que compõem o aspecto ambiental, demonstrou ser o mais crítico ao ambiente, considerando-se os parâmetros e pesos utilizados. Palavras-chave: dejetos, resíduos orgânicos, modelo de análiseEnvironmental analysis of use of different sources of nutrients associated with soil tillage systems ABSTRACTIntegrated analysis models can contribute to more efficient evaluation of the pollutant potential of sludge disposed in the environment. In order to study these aspects, an experiment was carried out for nine years on an Oxisol to evaluate five nutrient sources (three organic, one mineral, and a control) associated with five tillage systems in a subdivided block design, with three replications. The attributes used were available Cu and Zn, labile P compounds, diversity index of soil mesofauna, total N, and organic carbon content, as well as two questionnaires asking for technical opinions about the environmental impact of nutrient sources and soil tillage. In this evaluation a model was used which outputs, for each nutrient source within each soil tillage system, triangular figures and their areas, with a confidence interval of 90%. The nutrient sources were different regarding the environmental aspect, and the pig slurry was the worst source among them. Among the three indexes which took part in the environmental aspect, environmental risk index was the most critical considering the parameters and weights used.

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Determination of Orthophosphate in Aqueous Solutions Containing Labile Organic and Inorganic Phosphorus Compounds

Cited by 273 publications

References 0 publications

Phosphorus fractions in sandy soils of vineyards in southern Brazil

Phosphorus fractions in sandy soils of vineyards in southern Brazil

Phosphorus fractions in soil after successive crops of Pinus taeda L. without fertilization

Análise ambiental do uso de fontes de nutrientes associadas a sistemas de manejo do solo

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