Effect of soil properties on the kinetics of phosphate release

Smet, Johan De; Vanderdeelen, Jean; Hofman, Georges

doi:10.1080/00103629809370098

Cited by 22 publications

(20 citation statements)

References 17 publications

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“…Therefore, increasing K d is interpreted as increasing the rate of change in P desorption at a particular solution P concentration, as was observed for all levels of P loading when soil pH was raised to 7.1. Similar results can be found among the limited P desorption studies previously reported (He et al, 1994;De Smet et al, 1998).…”

Section: Soil Ph Effect On P Desorptionsupporting

confidence: 80%

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Influence of soil pH on inorganic phosphorus sorption and desorption in a humid brazilian Ultisol

Sato

Comerford²

2005

Rev. Bras. Ciênc. Solo

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SUMMARYLiming is a common practice to raise soil pH and increase phosphorus (P) bioavailability in tropical regions. However, reports on the effect of liming on P sorption and bioavailability are controversial. The process of phosphorus desorption is more important than P sorption for defining P bioavailability. However few studies on the relationship between soil pH and P desorption are available, and even fewer in the tropical soils. The effects of soil pH on P sorption and desorption in an Ultisol from Bahia, Brazil, were investigated in this study. Phosphorus sorption decreased by up to 21 and 34 % with pH increases from 4.7 to 5.9 and 7.0, respectively. Decreasing Langmuir K parameter and decreasing partition coefficients (K d ) with increasing pH supported this trend. Phosphorus desorption was positively affected by increased soil pH by both the total amount of P desorbed and the ratio of desorbed P to initially sorbed P. A decreased K parameter and increased K d value, particularly at the highest pH value and highest P-addition level, endorsed this phenomenon. Liming the soil had the double effect of reducing P sorption (up to 4.5 kg ha -1 of remaining P in solution) and enhancing P desorption (up to 2.7 kg ha -1 of additionally released P into solution).Index terms: liming, phosphorus bioavailability, Langmuir, partition coefficients, and Atlantic Forest.(

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Section: Soil Ph Effect On P Desorptionsupporting

confidence: 80%

“…The few that exist have obtained results ranging from increased P desorption with increasing pH (De Smet et al, 1998) to decreasing pH in others (Barrow, 2002). Rupa et al (2001) desorbed P from three Indian surface soils using six consecutive dilution extractions at pH values varying from 4.2 to 8.0.…”

Section: Introductionmentioning

confidence: 99%

Influence of soil pH on inorganic phosphorus sorption and desorption in a humid brazilian Ultisol

Sato

Comerford²

2005

Rev. Bras. Ciênc. Solo

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“…The negative value would suggest that the soil was essentially saturated with P. At the low P concentration of equilibration solution (24 mg P kg -1 ), more P ended up in the equilibrated solution than in water showing that more P was released from the soil in the presence of P. However, the soil-bound P increased as the concentration of the equilibration solution increased. This suggests that a different mechanism for binding P occurred, possibly a chemical reaction, which produced a precipitate (De Smet et al 1998). This is supported by the limited and decreasing extraction with bicarbonate of the bound P as the equilibration treatment increased.…”

Section: Phosphatesupporting

confidence: 49%

Binding of inorganic sulphate and phosphate in humid-climate soils measured using column leaching, equilibration and extraction methods

Kowalenko¹

2005

Can. J. Soil. Sci.

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Kowalenko, C. G. 2005. Binding of inorganic sulphate and phosphate in humid-climate soils measured using column leaching, equilibration and extraction methods. Can. J. Soil Sci. 85: 599-610. The ability of soil samples to bind applications of inorganic sulphate and phosphate was examined in the laboratory using column leaching, solution equilibration and extraction methods. Eleven soil samples from the Fraser Valley of British Columbia with a range of soil characteristics and management histories were examined. Column leaching trials showed that sulphate was bound to soils, but not as strongly as phosphate. There was no evidence of significant sulphate binding during the equilibration trials but there was substantial native sulphate bound by the soils as shown by extraction of significant sulphate concentrations by bicarbonate extraction following equilibration. This shows that sulphate is not bound according to the traditional theory of adsorption, but other undefined mechanisms are involved. Both column leaching and equilibration results showed that the samples studied varied considerably in their native phosphate retention attributes, with some samples releasing no phosphate and others releasing considerable phosphate into the water treatments. Equilibration trials showed that some of the soils bound large quantities of phosphate resulting in no phosphate in the soil solution whereas others bound much less resulting in significant phosphate concentrations in the soil solution. Phosphate binding followed the Freundlich equation in eight of the samples, the Tempkin equation in one sample and a direct linear relationship in two samples. The Langmuir equation fitted most of the samples that had followed Freundlich equation reasonably well, but did not fit the other samples. This showed that determination of the maximum amount of phosphate that can be bound by the sample (i.e., P saturation) using the Langmuir equation cannot be used for all humid-climate soils of British Columbia. Two alternate direct measurements are proposed to determine the potential risk of phosphate in soils to contaminate water: amount of phosphate released during equilibration with water (native unbound phosphate) and amount of phosphate bound during equilibration with a low (approximately 25 mg P kg -1 ) phosphate solution (potential for the soil to bind applied P). These results show that sulphate and phosphate binding mechanisms by coastal British Columbia soils are not well understood. The nature of the binding mechanisms needs to be determined to develop and interpret soil analyses for agronomic and environmental purposes. La lixiviation sur colonne révèle que les sulfates se lient au sol, mais pas autant que les phosphates. L'équilibrage n'indique pas de liaison sensible des sulfates, mais l'extraction d'une concentration importante de sulfates par le bicarbonate après équilibrage révèle qu'une bonne quantité de sulfates naturels est liée au sol. Ces résultats laissent supposer que les sulfates ne sont pas liés comme on le croyait t...

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“…McDowell and Sharpley (2003) believed that P desorption and diffusion from inside of soil particles probably was the rate limiting steps in short-and long term P release reactions, respectively. De Smet et al (1998) also related the initial fast and the final slow P release processes from noncalcareous soils to desorption and diffusion-dissolution reactions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus desorption kinetics in two calcareous soils amended with P fertilizer and organic matter

2011

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We studied the effects of poultry manure and pistachio compost with and without phosphorus fertilizer on the kinetics of phosphorus desorption in two calcareous soils of Kerman and Koohbanan farms in the southeastern of Iran. For this purpose mono potassium phosphate, at rates of 0, and 100 parts per million of phosphorus, and airdried manure, at rates of 0 and 4% were mixed with the soils. The soils were incubated at 24-25°C and near field capacity for 90 days in the greenhouse. Afterwards, the desorption of P was studied by the successive extraction with 0.5 M NaHCO 3 . The results of this research indicated that application of OM and fertilizer P combined increased P recovery in each of the extraction time, adding poultry manure and 100 mg phosphorus together to the soils, increased P desorption more than pistachio compost in the soils. The phosphorus desorption rate was initially rapid and then became slower until equilibrium was approached. Kinetic data were best described by power function and simple Elovich equations. Subsequent to these equations, parabolic diffusion equation was also well fitted the timedependent P desorption data.

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Effect of soil properties on the kinetics of phosphate release

Cited by 22 publications

References 17 publications

Influence of soil pH on inorganic phosphorus sorption and desorption in a humid brazilian Ultisol

Influence of soil pH on inorganic phosphorus sorption and desorption in a humid brazilian Ultisol

Binding of inorganic sulphate and phosphate in humid-climate soils measured using column leaching, equilibration and extraction methods

Phosphorus desorption kinetics in two calcareous soils amended with P fertilizer and organic matter

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