A simple phosphorus buffering index for Australian soils

Soil Research ◽  
2002 ◽  
Vol 40 (3) ◽  
pp. 497 ◽  
Author(s):  
L. L. Burkitt ◽  
P. W. Moody ◽  
C. J. P. Gourley ◽  
M. C. Hannah
Keyword(s):  
Initial Data ◽  
Soil Properties ◽  
Soil Property ◽  
Agricultural Soils ◽  
Single Point ◽  
Phosphorus Sorption ◽  
Data Set ◽  
P Sorption ◽  
Extractable P ◽  
Single Addition

Soil phosphorus (P) buffering capacity (PBC) is an important soil property that influences the amount of P fertiliser available for plant uptake. However, current methods of determining PBC are time-consuming and uneconomic in most commercial soil testing programs. The current study examined simpler methods of measuring the PBC of a wide range of Australian soils. Phosphorus sorption and extractable P data from 290 soils (initial data set) were collated to define the range of PBC values of Australian agricultural soils. Independently, detailed chemical and physical analyses were undertaken on a second set of 90 agricultural soils (principal data set), which were selected to represent the range of soil properties measured on the initial data set. Relationships between PBCO&S (Ozanne and Shaw 1968) values (P sorbed between solution P concentrations of 0.25 and 0.35 mg P/L) and 11 different single-point P sorption indices and selected soil properties were examined for the principal data set. Whilst relationships between PBCO&S values and selected soil properties such as oxalate-extractable iron and aluminium, and clay content, were generally poor, strong relationships existed between all of the single-point P sorption indices and PBCO&S. Results suggest that PBCO&S values were most closely related to the P buffering indices (PBI+ColP and PBI+OlsP) when a single addition of 1000 mg P/kg was added to soil and either the Colwell or 4.59 Olsen extractable P were added to the amount of P sorbed: PBI+ColP = (Ps + Colwell P)/c0.41 PBI+OlsP = (Ps + 4.59 Olsen P)/c0.41 where Ps is the amount of P sorbed (mg P/kg) from a single addition of 1000 mg P/kg, and c is the resulting solution P concentration (mg P/L). This index provides a simple and accurate method for estimating PBC, a fundamental soil property that influences the P fertiliser requirements of different soil types. phosphorus sorption capacity, single-point phosphorus sorption index, phosphorus retention index, soil properties, Colwell phosphorus, Olsen phosphorus.

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 Phosphate sorption parameters in relation to soil properties in some major agricultural soils of India

2016 ◽  
Vol 14 (1) ◽  
pp. 1-9 ◽  
Author(s):  
I Rashmi ◽  
VRR Parama ◽  
AK Biswas
Keyword(s):  
Soil Properties ◽  
Agricultural Soils ◽  
Clay Content ◽  
Phosphate Adsorption ◽  
Phosphorus Sorption ◽  
Sorption Data ◽  
K Value ◽  
P Sorption ◽  
Indian Representative ◽  
Sorption Parameters

Phosphorus sorption characteristics of some Indian representative agricultural soils belonging to four soil orders namely Vertisol, Inceptisol, Alfisol and Ultisol were investigated for adsorption behaviour of P and sorption data were fitted to Langmuir and Freundlich equations. The Langmuir constant i.e. adsorption maxima was highest for Vertisol (716.85 ?g g-1), followed by Ultisol (633.3 ?g g-1), Alfisol (501.46 ?g g-1) and Inceptisol (522.93 ?g g-1) respectively. The Freundlich ‘k’ value for Vertisol, Inceptisol, Alfisol and Ultisol were 159.12, 59.41, 110.57 and 181.36 ?g g-1 respectively, whereas the ‘n’ values were 2.05, 1.92, 2.49 and 3.07 g ml-1 respectively. The phosphate adsorption isotherm gave good fit adopting Langmuir (r2 = 0.96 to 0.99) and Freundlich (r2= 0.95 to 0.99) for the four soils. Phosphorus sorption maxima was significantly correlated with clay (r2=0.70), Al (r2= 0.73) and Fe (r2=0.81) forms, MPBC (r2=0.67) and Freundlich constants (r2=0.82). Among the various soil properties which correlated with P sorption maxima of significance was clay content (r2=0.97) was significantly correlated. The study illustrated that P sorption isotherm in relation to soil properties can be used as a tool of P management in sustainable crop production.SAARC J. Agri., 14(1): 1-9 (2016)

Phosphorus sorption capacity of alkaline Manitoba soils and its relationship to soil properties

2005 ◽  
Vol 85 (3) ◽  
pp. 417-426 ◽  
Author(s):  
D V Ige ◽  
O O Akinremi ◽  
D N Flaten ◽  
B. Ajiboye ◽  
M A Kashem
Keyword(s):  
Soil Properties ◽  
Langmuir Isotherm ◽  
Single Point ◽  
Chemical Properties ◽  
Phosphorus Sorption ◽  
Point Index ◽  
Adsorption Parameters ◽  
Retention Capacity ◽  
Phosphorus Adsorption ◽  
P Retention

The establishment of the P retention capacity of soil in Manitoba is essential for effective management of P in the region. However, the methods for determining the P retention capacity for neutral to calcareous soils in the Eastern Prairies are not well developed. The objectives of this study were to determine the P retention capacity of Manitoba soils and to generate equations that relate these capacities to other soil properties. One hundred and fifteen archived surface soils were selected and their physico-chemical properties were measured. These soils were used to generate a single-point P adsorption index by equilibrating 2 g of soil in 20 mL of 0.01 M KCl solution containing either 150 (P150) or 400 (P400) mg P L-1. A subset of 26 of these soils was used for multipoint isotherms with P concentrations in the range of 0–1000 mg P L-1. The data obtained were fitted to the Langmuir isotherm and the adsorption indices were correlated with the various soil properties that were then used to developed predictive equations of the P retention capacity of the soil. The values of the adsorption index, P150, obtained from the single point adsorption study using 150 mg P L-1, ranged between 88 and 891 mg P kg-1, while that of P400 ranged between 100 and 1250 mg P kg-1. A better correlation was obtained between P150 and soil properties compared with P400. For the 26 soil subset, the adsorption indices, Smax1 to Smax 6, obtained from the Langmuir isotherm, ranged from 300 to 1330 mg kg-1. A good correlation was obtained between the single point index and the multipoint isotherm (r = 0.93). Hence, Smax for the 115 soils was estimated from the relationship between P150 and Smax 3 of the 26 soils. The best relationships between the adsorption parameters, P150 and Smax, and the soil properties were obtained with the sum of Mehlich-3 extractable Ca and Mg (R2= 0.66) and the sum of exchangeable Ca and Mg (R2= 0.64). Mehlich-3-Ca and -Mg each explained 56% of the variation, while clay content explained 40% of the variation in the P retention capacity of these soils. Unlike the widely reported influence of Al and Fe in acid soils, our study showed that the retention of P in Manitoba soils was influenced more by Ca and Mg and soil texture. Key words: Phosphorus, phosphorus retention capacity, phosphorus adsorption capacity, phosphorus sorption, single-point index

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).

Phosphorus sorption-desorption by some sediments of the Johnstone Rivers catchment, northern Queensland

1992 ◽  
Vol 43 (6) ◽  
pp. 1535 ◽  
Author(s):  
C Pailles ◽  
PW Moody
Keyword(s):  
Equilibrium Solution ◽  
Buffer Capacity ◽  
Sea Water ◽  
Phosphorus Sorption ◽  
Constant Amount ◽  
Inorganic P ◽  
P Sorption ◽  
P Concentration ◽  
Extractable P ◽  
Water Columns

Phosphorus (P) sorption-desorption characteristics were determined for 11 sediments from the Johnstone Rivers catchment, northern Queensland. Sediments were selected to cover a range in values of Bray extractable P from 0.1 to 10.4 mg P kg-1. P sorption curves were determined by using 0.01 M NaCl to simulate fluvial water conditions and, on a restricted number of sediments, 0.5 M NaCl to simulate sea water. The amounts of P released in 10 successive extractions for 30 min with 0.01 M CaCl2 were determined for each sediment. The amounts of P desorbed either declined to nondetectable levels or declined to a constant amount. These desorption curves were used to delineate 'rapidly desorbable' P from 'slowly desorbable' P. Bray extractable P and adsorption characteristics (equilibrium solution P concentration and P buffer capacity) were poorly correlated with 'rapidly desorbable' P. Most sediments in the suite would act as P sinks in both fluvial and marine environments because their equilibrium P concentrations are lower than the dissolved inorganic P concentrations of their respective water columns. For those sediments acting as potential sources (5 from 11 in 0.01 M NaC1, 2 from 6 in 0.5 M NaCl), amounts of P that could potentially be desorbed into the fluvial water column ranged from 0.1 to 3.9 mg P kg-1 sediment.

Influence of biosolids on phosphorus sorption characteristics of a Vertisol in comparison with manures and fertilizer

2007 ◽  
Vol 87 (5) ◽  
pp. 511-521 ◽  
Author(s):  
Babasola Ajiboye ◽  
Olalekan O Akinremi ◽  
Geza J Racz ◽  
Donald N Flaten
Keyword(s):  
Sorption Isotherm ◽  
Single Point ◽  
Chemical Properties ◽  
Similar Proportion ◽  
Phosphorus Sorption ◽  
P Sorption ◽  
P Loss ◽  
Degree Of P Saturation ◽  
Labile P ◽  
Sorption Characteristics

Regulation of manure application in Manitoba has raised the question of whether or not biosolids application should be regulated in the same way. This study examined the effects of biosolids (BIO) applications on P sorption characteristics of a Vertisol in comparison with dairy cattle (DAIRY) and hog (HOG) manures, and monoammonium phosphate (MAP) fertilizer using the classical sorption isotherm and single point sorption index. Pertinent chemical properties and degree of P saturation (DPS) were also determined. The sorption maximum (Smax) in the control was reduced from 655 mg kg-1, to a range of 536–655 mg kg-1 with BIO, 559–650 mg kg-1 with MAP, 402–568 mg kg-1 with DAIRY, and 350–587 mg kg-1 with HOG depending upon the rate of P added. The lower DPS in the soil amended with BIO suggests a lower risk of P loss with biosolids compared with manures. The higher P sorption capacity of biosolids-amended soils compared with soils amended with manures suggest that Ca added with BIO increased the number of P sorption sites by a similar proportion to the amount of P added. Key words: Biosolids, P sorption isotherm, degree of P saturation, labile P, non-labile P

scholarly journals Effect of Eucalyptus globullus biochar addition on the availability of phosphorus in acidic soil

2017 ◽  
Vol 35 (1) ◽  
pp. 75-81 ◽  
Author(s):  
María José Martínez C. ◽  
Julio César España A. ◽  
José De Jesus Diaz V.
Keyword(s):  
Soil Properties ◽  
Crop Production ◽  
Agricultural Soils ◽  
P Availability ◽  
Phosphorus Sorption ◽  
Acidic Soils ◽  
Phosphate Fertilizers ◽  
Normal Soil ◽  
Insoluble Compounds ◽  
P Retention

Phosphorus (P) is one of the primary nutrients limiting crop production. The application of phosphate fertilizers in acidic soils leads to the formation of secondary insoluble compounds that reduces the effectiveness of the fertilizer. The addition of biochar may represent a solution to the problem of nutrients bioavailability, especially P. In this study, tests were performed to determine the effects of amending soil with five different percentages of biochar (0, 5, 10, 20, and 35% w/w) on the phenomena of P sorption and desorption. The effect of soil/ biochar contact treatments on P availability was also examined. Phosphorus sorption was lower in the soils containing biochar compared to normal soil. The accumulated desorption quantity after eight consecutive extractions was 85% higher when 35% biochar was added to the soil than soil alone. Moreover, the application of 35% biochar increased the concentration of soluble P up to 38% after 30 days of incubation. Based on these results, we deduced that biochar induces changes in P retention soil properties that may be beneficial for agricultural soils.

scholarly journals Evaluation of phosphate sorption capacity and external phosphorus requirement of some agricultural soils of the southwestern Ethiopian highlands

2021 ◽  
Vol 18 (2) ◽  
pp. 136
Author(s):  
Berhanu Dinssa ◽  
Eyasu Elias
Keyword(s):  
Sorption Capacity ◽  
Crop Production ◽  
Agricultural Soils ◽  
Soil Characteristics ◽  
Soil Samples ◽  
Phosphorus Sorption ◽  
Acidic Soils ◽  
Ethiopian Highlands ◽  
P Sorption ◽  
P Sorption Capacity

<span>One of the most soil fertility management problems for crop production on acidic soils of the Ethiopian highlands is phosphorus fixation. The research was executed to assess the P-sorption capacity and to determine the external P requirement of different acidic soils in the Southwestern highlands of Ethiopia. Phosphorus sorption capacity (Kf) and its relation with selected soil characteristics were assessed for some major agricultural soils in the Ethiopian highlands to answer the questions, ‘What are the amount of P-sorption capacity and external P requirement of Nitisols, Luvisols, Alisols, and Andosols in Ethiopia?’. Twelve surface soil samples (at depth of 0-30 cm) were gathered and the P-sorption capacity was estimated. Phosphorus-sorption data were obtained by equilibrating 1 g of the 12 soil samples with 25 ml of KH<sub>2</sub>PO<sub>4</sub> in 0.01 M CaCl2, having 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, and 330 mg P L<sup>-1</sup> for 24 hours. The data were adjusted to the Freundlich adsorption model and the relationship among P-sorption and soil characteristics was established by correlation analysis.  Clay content and exchangeable acidity, organic matter, Al<sub>2</sub>O<sub>3</sub>, and Fe<sub>2</sub>O<sub>3</sub> oxides have affected phosphorus-sorption at a significance level of (P &lt; 0.05).  Alisols had the highest Kf value (413 mg kg<sup>-1</sup>) but Nitisols had the lowest Kf (280 mg kg<sup>-1</sup>). The external phosphorus fertilizer requirement of the soils was in the order of 25, 30, 32, and 26 mg P kg<sup>-1</sup> for Nitisols, Luvisols, Alisols, and Andosols sequentially. The Kf varies among different soil types of the study area. The magnitude of the soil’s Kf was affected by the pH of the soil, soil OM content, and oxides of Fe and Al. Therefore, knowledge of the soils’ P retention capacity is highly crucial to determine the correct rate of P </span><span>fertilizer</span><span> for crop production.</span>

Factors affecting the change in extractable phosphorus following the application of phosphatic fertiliser on pasture soils in southern Victoria

Soil Research ◽  
2001 ◽  
Vol 39 (4) ◽  
pp. 759 ◽  
Author(s):  
L. L. Burkitt ◽  
C. J. P. Gourley ◽  
P. W. G. Sale ◽  
N. C. Uren ◽  
M. C. Hannah
Keyword(s):  
Soil Properties ◽  
Organic Carbon Content ◽  
Single Superphosphate ◽  
Soil P ◽  
Olsen P ◽  
P Sorption ◽  
P Concentration ◽  
Extractable P ◽  
Fertiliser Application ◽  
High Organic Carbon Content

Nine pasture soils from high rainfall zones of southern Victoria were analysed for a range of chemical and physical properties before receiving a single application of P fertiliser in the form of triple superphosphate (TSP), single superphosphate (SSP), or TSP and lime (5 t/ha) at amounts ranging from 0 to 280 kg P/ha. Soils were analysed for bicarbonate-extractable P concentration, using both the Olsen P and Colwell P methods, 6 and 12 months after fertiliser application. A strong positive linear relationship existed at all sites between the amount of P applied and both the Olsen P and Colwell P concentrations. The slopes of these relationships measured the change in extractable P concentration (Δ EP) per unit of P applied, whilst the inverse of the ΔEP value indicated the amount of P fertiliser required above maintenance to increase the extractable P concentration by 1 mg/kg. These values ranged from 5 to 15 kg P/ha, depending on soil type. The ΔEP measured by the Olsen (Δ EP Olsen ) method was closely related to selected soil properties and P sorption measures, whilst the ΔEPColwell values were also closely related to selected soil properties and P sorption measures, but only when one particular site, an acidic sand, with a high organic carbon content was excluded from the analysis. In general, simple, direct measures of soil P sorption could allow the estimation of ΔEP values on different soil types. The application of P in the form of SSP resulted in a trend for higher ΔEP values than occurred with TSP. This difference was significant on 3 sites (P < 0.05), but depended on the method of extraction and the time after fertiliser application. The application of lime significantly (P < 0.001) increased soil pH (H2 O and CaCl 2 ) and decreased the concentration of exchangeable Al, 6 months after treatments were applied, but generally had little impact on ΔEP values.

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.

Sign in / Sign up

Export Citation Format

Share Document