scholarly journals Phosphorus sorption on tropical soils with relevance to Earth system model needs

Soil Research ◽  
2019 ◽  
Vol 57 (1) ◽  
pp. 17 ◽  
Author(s):  
Julia Brenner ◽  
Wesley Porter ◽  
Jana R. Phillips ◽  
Joanne Childs ◽  
Xiaojuan Yang ◽  
...  
Keyword(s):  
Sorption Isotherms ◽  
Clay Content ◽  
Tropical Soils ◽  
Soil Characteristics ◽  
P Availability ◽  
Earth System ◽  
Phosphorus Sorption ◽  
Soil P ◽  
P Sorption ◽  
Earth System Models

Phosphorus (P) availability critically limits the productivity of tropical forests growing on highly weathered, low-P soils. Although efforts to incorporate P into Earth system models (ESMs) provide an opportunity to better estimate tropical forest response to climate change, P sorption dynamics and controls on soil P availability are not well constrained. Here, we measured P and dissolved organic carbon (DOC) sorption isotherms on 23 soils from tropical Oxisol, Ultisol, Inceptisol, Andisol, and Aridisol soils using P concentrations from 10 to 500mg P L−1, and DOC concentrations from 10 to 100mg DOC L−1. Isotherms were fit to the Langmuir equation and parameters were related to soil characteristics. Maximum P sorption capacity (Qmax) was significantly correlated with clay content (ρ=0.658) and aluminium (Al)- or iron (Fe)-oxide concentrations (ρ=0.470 and 0.461 respectively), and the DOC Qmax was correlated with Fe oxides (ρ=0.491). Readily available soil characteristics could eventually be used to estimate Qmax values. Analysis of literature values demonstrated that the maximum initial P concentration added to soils had a significant impact on the resultant Qmax, suggesting that an insufficiently low initial P range could underestimate Qmax. This study improves methods for measuring P Qmax and estimating Qmax in the absence of isotherm analyses and provides key data for use in ESMs.

scholarly journals Kinetics of phosphorus sorption in soils in the state of Paraíba¹

2011 ◽  
Vol 35 (4) ◽  
pp. 1301-1310 ◽  
Author(s):  
Hemmannuella Costa Santos ◽  
Fábio Henrique Tavares de Oliveira ◽  
Ignácio Hernan Salcedo ◽  
Adailson Pereira de Souza ◽  
Valério Damásio da Mota Silva
Keyword(s):  
Soil Properties ◽  
Clay Content ◽  
The State ◽  
Phosphorus Sorption ◽  
P Adsorption ◽  
Soil P ◽  
P Sorption ◽  
P Concentration ◽  
Elovich Equation ◽  
Kinetics Of

The soil P sorption capacity has been studied for many years, but little attention has been paid to the rate of this process, which is relevant in the planning of phosphate fertilization. The purpose of this experiment was to assess kinetics of P sorption in 12 representative soil profiles of the State of Paraíba (Brazil), select the best data fitting among four equations and relate these coefficients to the soil properties. Samples of 12 soils with wide diversity of physical, chemical and mineralogical properties were agitated in a horizontal shaker, with 10 mmo L-1 CaCl2 solution containing 6 and 60 mg L-1 P, for periods of 5, 15, 30, 45, 60, 90, 120, 420, 720, 1,020, and 1,440 min. After each shaking period, the P concentration in the equilibrium solution was measured and three equations were fitted based on the Freundlich equation and one based on the Elovich equation, to determine which soil had the highest sorption rate (kinetics) and which soil properties correlated to this rate. The kinetics of P sorption in soils with high maximum P adsorption capacity (MPAC) was fast for 30 min at the lower initial P concentration (6 mg L-1). No difference was observed between soils at the higher initial P concentration (60 mg L-1). The P adsorption kinetics were positively correlated with clay content, MPAC and the amount of Al extracted with dithionite-citrate-bicarbonate. The data fitted well to Freundlich-based equations equation, whose coefficients can be used to predict P adsorption rates in soils.

Soil phosphorus buffering measures should not be adjusted for current phosphorus fertility

Soil Research ◽  
2008 ◽  
Vol 46 (8) ◽  
pp. 676 ◽  
Author(s):  
L. L. Burkitt ◽  
P. W. G. Sale ◽  
C. J. P. Gourley
Keyword(s):  
Agricultural Soils ◽  
Soil Phosphorus ◽  
Single Point ◽  
Sorption Isotherms ◽  
Phosphorus Sorption ◽  
Soil P ◽  
P Sorption ◽  
P Concentration ◽  
Extractable P ◽  
Fertiliser Application

Soil phosphorus (P) sorption is an important and relatively stable soil property which dictates the equilibrium between sorbed and solution P. Soil P sorption measures are commonly adjusted for the effect of current P fertility on the amount of P a soil sorbs. In the case of highly fertilised agricultural soils, however, this adjustment is likely to be inappropriate as it may mask changes in a soil’s capacity to sorb P, which could affect future P fertiliser applications. A study was undertaken to compare adjusted or unadjusted methods of measuring P sorption using 9 pasture soils sampled from southern Victoria which had previously received P fertiliser and lime. The P sorption assessment methods included: P sorption isotherms, P-buffering capacity (PBC) measures (slope between equilibrium P concentration of 0.25 and 0.35 mg P/L), and single-point P-buffering indices (PBI), with methods either adjusted or unadjusted for current P fertility. A single application of 280 kg P/ha, 6 months before sampling, resulted in a general negative displacement of unadjusted P sorption isotherm curves, indicating reduced P sorption on 8 of the 9 soils. Adding the Colwell extractable P concentration to the amount of P sorbed before calculating the slope (PBC+ColP), tended to negate this fertiliser effect and, in 2 of the 9 soils, resulted in a significant increase in PBC+ColP values. Increasing rates of P fertiliser application (up to 280 kg P/ha) resulted in a consistent trend to decreasing PBI values (unadjusted for Colwell P), which was significant at 4 of the 9 sites after 6 months. However, only minimal changes in PBI values were determined when PBI was adjusted for current P fertility (PBI+ColP). Phosphorus sorption properties appeared reasonably stable over time, although 2 soils, both Ferrosols, indicated significant linear increases in PBI values when these sites remained unfertilised for 30 months. Lime significantly increased both PBI and PBI+ColP values at all sites 6 months after application, but the effect generally diminished after 30 months, suggesting PBI measurements should not be taken immediately after liming. These results demonstrate that unadjusted measures of P sorption are more likely to accurately reflect changes in soil P sorption capacity following P fertiliser applications and suggest that the unadjusted PBI be used in commercial soil testing rather that the currently adjusted PBI+ColP.

scholarly journals P-sorption and desorption in Savanna Brazilian soils as a support for phosphorus fertilizer management

2013 ◽  
Vol 37 (6) ◽  
pp. 521-530 ◽  
Author(s):  
Flávio Araújo Pinto ◽  
Edicarlos Damacena de Souza ◽  
Helder Barbosa Paulino ◽  
Nilton Curi ◽  
Marco Aurélio Carbone Carneiro
Keyword(s):  
Clay Content ◽  
Soil Characteristics ◽  
Fertilizer Management ◽  
Phosphorus Fertilizer ◽  
Phosphorus Adsorption ◽  
P Sorption ◽  
Brazilian Soils ◽  
Soil Clay ◽  
Sand Base ◽  
Soil Clay Content

Phosphorus (P) sorption by soils is a phenomenon that varies depending on soil characteristics, influencing its intensity and magnitude, which makes it a source or drain of P. The objective of this study was to determine the Maximum Phosphorus Adsorption Capacity (MPAC) and desorption of P from soils under native Savanna Brazilian and verify the correlation between MPAC and P Capacity Factor (PCF) with the chemical and physical properties of these soils. The study was conducted in seven soils under native Savannas. The Langmuir isotherms were adjusted from the values obtained in sorption assays, being evaluated the MPAC, the energy adsorption (EA) and PCF, which was calculated according to the levels of P-adsorbed and P-sorbed. Values of MPAC were classified as high in most soils, ranging from 283 up to 2635 mg kg-1 of P in the soil and were correlated with soil organic matter, clay, silt, sand, base saturation and pH. The PCF was higher in soils where the MPAC was also higher. The use of only one attribute of soil (clay content) as a criterion for the recommendation of phosphated fertilization, as routinely done, is susceptible to errors, needing the use of more attributes for a more accurate recommendation, as a function of the complexity of the interactions involved in the process.

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

2005 ◽  
Vol 29 (5) ◽  
pp. 685-694 ◽  
Author(s):  
Shinjiro Sato ◽  
Nicholas Brian Comerford
Keyword(s):  
Soil Ph ◽  
Ph Value ◽  
Tropical Soils ◽  
Inorganic Phosphorus ◽  
Phosphorus Sorption ◽  
Tropical Regions ◽  
P Sorption ◽  
Phosphorus Desorption ◽  
P Desorption ◽  
P Bioavailability

Liming 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 (Kd) 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 Kd 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).

scholarly journals Phosphorus Sorption and Redistribution on Soil Solid Phase in a Brazilian Haplorthox Amended with Biosolids

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Ricardo de Oliveira Munhoz ◽  
Ronaldo Severiano Berton ◽  
Otávio Antonio de Camargo
Keyword(s):  
Binding Energy ◽  
Solid Phase ◽  
Sorption Isotherms ◽  
Land Application ◽  
Phosphorus Sorption ◽  
Sequential Fractionation ◽  
Soil P ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
P Fraction

Land application of biosolids (SS) can cause a buildup of phosphorus (P) in the top soil. The changes in the soil P characteristics may be assessed by the sorption isotherm and the sequential fractionation techniques. Samples of Haplorthox were collected from a field experiment where maize was cultivated for two years, after two applications of SS originated from two cities of São Paulo State, Brazil. SS applications added a total of 125, 250, 500, 1000 and 2000 kg ha−1of P in the area. To perform the sorption isotherms and obtain P maximum sorption capacity (Qmax) and the binding energy, soil samples were submitted to increasing P concentration solutions until equilibrium was reached. Sequential fractionation was done by a sequential extraction with CaCl2, NaHCO3, NaOH, HCl, and HNO3+ HClO4(residual). Addition of biosolids from both cities to the soil decreasedQmaxand the binding energy obtained by the Langmuir equation. SS additions changed the P fractions distribution in the soil by increasing the labile fractions (P-CaCl2and P-NaHCO3) and the moderately labile fraction (P-NaOH) by 11.2% and 20.3%, respectively, in detriment of the most resistant P fraction.

Phosphorus sorption - desorption by purple soils of China in relation to their properties

Soil Research ◽  
2007 ◽  
Vol 45 (3) ◽  
pp. 182 ◽  
Author(s):  
M. Li ◽  
Y. L. Hou ◽  
B. Zhu
Keyword(s):  
Binding Energy ◽  
Single Point ◽  
Phosphorus Sorption ◽  
Soil P ◽  
P Sorption ◽  
Desorption Curve ◽  
Degree Of P Saturation ◽  
Soil Test P ◽  
Sorption Index ◽  
Water Eutrophication

The understanding of phosphorus (P) sorption and desorption by soil is important for better managing soil P source and relieving water eutrophication. In this study, sorption–desorption behaviour of P was investigated in purple soils, collected from 3 kinds of purple parent materials with different kinds of land cover, in the upper reaches of Yangtze River, China, using a batch equilibrium technique. Results showed that most of the farmed purple soils had P sorption capacity (PSC) values ranging from 476 to 685 mg P/kg, while higher PSC values were observed in the soils from forestland and paddy field. A single-point P sorption index (PSI) was found to be significantly correlated with PSC (R2 = 0.94, P < 0.001), suggesting its use in estimating PSC across different types of purple soils. The PSC of purple soils was positively and strongly related to the contents of amorphous Fe and Al oxides (r = 0.73, P < 0.001), clay (r = 0.55, P < 0.01), and organic matter (r = 0.50, P < 0.05). Furthermore, the constant relating to binding strength was positively correlated with the content of amorphous Fe and Al oxides (r = 0.66, P < 0.01), but negatively correlated with labile Ca (r = –0.43, P < 0.05) and soil pH (r = –0.53, P < 0.01). Some acidic purple soils with high binding energy featured a power desorption curve, suggesting that P release risk can be accelerated once the P sorbed exceeds a certain threshold. Other soils with low binding energy demonstrated a linear desorption curve. The P desorption percentage was significantly correlated with soil test P (r = 0.78, P < 0.01) and the degree of P saturation (r = 0.82, P < 0.01), but negatively correlated with PSC (r = –0.66, P < 0.01).

scholarly journals Relationship Between Exchangeable Alumunium and Phosphorus Sorption Parameters of Indonesian Acid Soils

2004 ◽  
Vol 6 (2) ◽  
pp. 70-74
Author(s):  
A Hartono
Keyword(s):  
Acid Soils ◽  
Sorption Isotherms ◽  
Clayey Soils ◽  
Phosphorus Sorption ◽  
General Reaction ◽  
P Sorption ◽  
Hydrous Oxides ◽  
Sorption Parameters ◽  
Main Component

In acid soils, phosphorus (P) sorption is generally attributed to hydrous oxides of Fe and Aluminum (AI) particularly intropical soils with low pH. However, reports concerning the role of exchangeable AI in P sorption mechanism are very liltle.Phosphorus (P) sorption isotherms were studied in fifteen acid upland soils containing different amount of exchangeable AI. Psorption characteristics were satisfactorily described by the Langmuir equation. which was used to determine P sorptionmaxima and bonding energies, with r values ranging from 0.97 to 0.99. The soils varied widely in their capacities to sorb P.P sorption maxima rangedfrom 303 to 1429 mg kg-I (mean 627 mg kg-I) and bonding energies from 0.65 to 8.00 L mtl (mean 2.39 L mg-I). Exchangeable AI was found not correlated with P sorption maxima (r = -0.11) but significantly correlated with P bonding energies (r = 0.68**). This was clearly shown by clayey soils from Java and Sumatra but not in sandy soils fromKalimantan. The results suggested that in general. reaction of exchangeable AI with P increased P bonding energy butexchangeable AI was not the main component in P sorption maximum

Mechanisms for altering phosphorus sorption characteristics induced by low-molecular-weight organic acids

2016 ◽  
Vol 96 (3) ◽  
pp. 289-298 ◽  
Author(s):  
Yongzhuang Wang ◽  
Joann K. Whalen ◽  
Xin Chen ◽  
Yanhong Cao ◽  
Bin Huang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Low Molecular Weight ◽  
Minor Effect ◽  
Phosphorus Sorption ◽  
Sorption Data ◽  
P Fractionation ◽  
Soil P ◽  
P Sorption ◽  
A Minor

Exudation of low-molecular-weight organic acids (LMWOAs) from plant roots enhances phosphorus (P) acquisition from soil, either by dissolving P fixed in secondary minerals or by reducing P sorption to organo-minerals. How LMWOAs may modify P sorption in soils with contrasting pH is not well understood, much less the mechanisms involved. The effects of three common LMWOAs (oxalic, citric, and malic acids) on P sorption in calcareous, neutral, and acidic soils were studied in batch experiments, followed by sequential P fractionation to elucidate the mechanisms whereby LMWOAs alter P sorption. The sorption data of the three soils fitted better to the Freundlich equation (r2 = 0.325–0.994, P < 0.05) than the Langmuir and linear equations. Oxalic, citric, and malic acids at 10 mmol kg−1 soil decreased the Freundlich P sorption parameters Kf and n, which represent P sorption capacity and energy, due to the fact that LMWOAs reduced P sorption in NaHCO3-Pi (soil soluble and exchangeable Pi, 23.8–30.9%) and NaOH-Pi (Fe-Pi and Al-Pi, 21.6–54.2%) fractions of the three soils. Comparing acidified P-LMWOAs solutions with the pH-adjusted P-LMWOAs solutions (pH = 7) had a minor effect on P sorption. Our results indicated that the reduction in soil P sorption was due to ligand exchange and chelation of LMWOAs with Fe and Al minerals, and the acid strength of LMWOAs had a minor effect on P sorption in calcareous, neutral, and acid soils.

Phosphorus sorption in relation to soil properties for the major soil types of South-Western Australia

Soil Research ◽  
1991 ◽  
Vol 29 (5) ◽  
pp. 603 ◽  
Author(s):  
B Singh ◽  
RJ Gilkes
Keyword(s):  
Regression Analysis ◽  
Western Australia ◽  
Stepwise Regression ◽  
Clay Content ◽  
Soil Types ◽  
Phosphorus Sorption ◽  
P Sorption ◽  
Agricultural Areas ◽  
Langmuir And Freundlich Equations ◽  
Sorption Characteristics

The P sorption characteristics of 97 soils that are representative of the agricultural areas of Western Australia were described using Langmuir and Freundlich equations. The Langmuir P maximum (xm) ranged from 11 to 2132 �g g-1 soil and the Freundlich k coefficient ranged from 1 to 1681. Clay content, DCB Fe and Al, oxalate Fe and AL, and pyrophosphate Al were positively related to xm and k. By using stepwise regression analysis, the combination of DCB and oxalate-soluble A1 predicted more than 75% Of the variation in the P sorption coefficients. Reactive Al compounds may thus be responsible for much of the P sorption by these soils. Soil pH in 1 M NaF (pH 8.2), which is normally used for the detection of allophanic material, was strongly related to the P sorption coefficients and might therefore be used as a quick test for predicting the P sorption capacity of soils.

scholarly journals Phosphorus sorption capacity of different types of opoka

2007 ◽  
Vol 38 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Victor Cucarella ◽  
Tomasz Zaleski ◽  
Ryszard Mazurek
Keyword(s):  
Sorption Capacity ◽  
Sorption Isotherms ◽  
Freundlich Isotherm ◽  
Carbonate Content ◽  
Phosphorus Sorption ◽  
P Sorption ◽  
P Sorption Capacity ◽  
Onsite Wastewater Treatment Systems ◽  
Different Types ◽  
Phosphorus Sorption Capacity

Phosphorus sorption capacity of different types of opoka The bedrock opoka has been lately reported as an appropriate reactive media for onsite wastewater treatment systems due to its high phosphorus (P) sorption capacity. However, variations on its chemical composition may affect its reactivity with P, therefore leading to a variable P removal efficiency. In this paper, the P-sorption capacity of three different types of opoka from the region of Miechów, Poland, is reported. According to the silica and carbonate content, opoka samples were classified as light-weight and heavy-weight opoka. When heated over 900°C, opoka showed a very high P-sorption capacity that was well correlated to its Ca content. P-sorption isotherms from batch experiments with an artificial P solution were plotted and fitted to the Langmuir and Freundlich adsorption models. The Freundlich isotherm appeared to model better the P-sorption of light opoka and the Langmuir isotherm of heavy opoka, suggesting different dominating mechanisms of P-sorption by light and heavy opoka.

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