Assessing the Feasibility of Olsen P and P Sorption Parameters in Acidic Soils

Phosphorus (P) exports from agricultural land are a problem world-wide and soil tests are often used to identify high risk areas. A recent study investigated changes in soil (0–20 mm), soil water and overland flow in 4 recently laser-graded (<1 year) and 4 established (laser-graded >10 years) irrigated pastures in south-eastern Australia before and after 3 years of irrigated dairy production. We use the results from that study to briefly examine the relationships between a series of ‘agronomic’ (Olsen P, Colwell P), environmental (water-extractable P, calcium chloride extractable P, P sorption saturation, and P sorption), and other (total P, organic P) soil P tests. Of the 2 ‘agronomic’ soil P tests, Colwell P explained 91% of the variation in Olsen P, and Colwell P was better correlated with the other soil tests. With the exception of P sorption, all soil P tests explained 57% or more of the total variation in Colwell P, while they explained 61% or less of Olsen P possibly due to the importance of organic P in this soil. Variations in total P were best explained by the organic P (85%), Calcium chloride extractable P (83%), water-extractable P (78%), and P sorption saturation (76%). None of the tests adequately predicted the variation in P sorption at 5 mg P/L equilibrating solution concentration. The results of this limited study highlight the variability between soil P tests that may be used to estimate P loss potential. Moreover, these results suggest that empirical relationships between specific soil P tests and P export potential will have limited resolution where different soil tests are used, as the errors in the relationship between soil test P and P loss potential are compounded by between test variation. We conclude that broader study is needed to determine the relationships between soil P tests for Australian soils, and based on that study a standard protocol for assessing the potential for P loss should be developed.

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

Jurnal Ilmu Tanah dan Lingkungan ◽

10.29244/jitl.6.2.70-74 ◽

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

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Effects of decalcification on the phosphate sorption characteristics of eight calcareous soils

Soil Research ◽

10.1071/sr9900919 ◽

1990 ◽

Vol 28 (6) ◽

pp. 919 ◽

Cited By ~ 3

Author(s):

ICR Holford ◽

M Chater ◽

GEG Mattingly

Keyword(s):

Calcareous Soils ◽

Sorption Isotherms ◽

Phosphate Sorption ◽

Surface Equation ◽

P Sorption ◽

Surface Areas ◽

Freundlich Equation ◽

Sorption Parameters ◽

Parameter Values ◽

Sorption Characteristics

Phosphate sorption isotherms and parameter values were determined on eight calcareous soils which were carefully decalcified using a procedure which minimized changes in cation saturation. Calcite content of the original soils varied from 0.8 to 24 2% and calcite surface areas from 4 . 0 to 8.5 m2 g-1. Sorption parameters were derived from the Langmuir 'two-surface' equation. Decalcification increased phosphate sorption at low residual P concentrations (<0.8 mg L-1) but decreased it at higher concentrations. The higher P sorption was associated with an increase in affinity because the calculated sorption capacities of high-affinity surfaces were not increased. These sorption capacities were well correlated with iron oxide contents of the soils, so the increase in phosphate affinity of these surfaces was consistent with the decrease in pH (0.5 to 1.5 units) of the decalcified soils. The lower P sorption at higher concentrations was associated with a substantial decrease in sorption capacity of the postulated low-affinity surfaces. These latter decreases were quantitatively correlated with the calcite surface areas of the original soils. These and other changes in phosphate sorption characteristics support the utility of the Langmuir 'two-surface' equation in providing information, compatible with what would be expected from more complex mechanistic models, and which exceeds what one would expect from other simpler models such as the Freundlich equation. They also support an hypothesis that an important component of low-affinity surfaces of these calcareous soils is calcite on which organic anions are co-adsorbed.

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Soil phosphorus sorption properties in different fertilization systems

Plant Soil and Environment ◽

10.17221/696/2018-pse ◽

2019 ◽

Vol 65 (No. 2) ◽

pp. 78-82 ◽

Cited By ~ 1

Author(s):

Ewa Szara ◽

Tomasz Sosulski ◽

Magdalena Szymańska

Keyword(s):

Binding Energy ◽

Soil Phosphorus ◽

Sorption Properties ◽

Phosphorus Sorption ◽

Sorption Coefficient ◽

P Sorption ◽

P Content ◽

Sorption Parameters ◽

Total P

The study aimed at the evaluation of the accumulation and vertical distribution of different forms of phosphorus (P) in reference to phosphorus sorption properties subject to mineral (NPK), mineral-organic (NPK + M), and organic (M) fertilisation. It was carried out in a long-term experimental field in Skierniewice (Central Poland) conducted since 1923 under rye monoculture. Total P content in the M and NPK soil profile was similar and lower than in the NPK + M soil. The content of organic P in Ap and Eet horizons of both manured soils was similar and higher than in the NPK soil. The Langmuir P sorption maximum (Smax) in the studied soils ranged from 39.7 to 90 mg P/kg, while the Freundlich P sorption coefficient aF ranged from 6.9 to 41.9 mg P/kg. Higher variability of parameters related to the binding energy from the Lanqmuir (k) and Freundlich (aF) equations was determined between soil horizons than between the fertilisation systems. Nonetheless, in M and NPK + M soils, sorption parameters aF and Smax and binding energy (k, bF) were considerably lower than in the NPK soil. The content of water extracted P in manured soils was higher than in the NPK soil.

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Amelioration of soil acidity, Olsen-P, and phosphatase activity by manure- and peat-derived biochars in different acidic soils

Arabian Journal of Geosciences ◽

10.1007/s12517-018-3616-1 ◽

2018 ◽

Vol 11 (11) ◽

Cited By ~ 13

Author(s):

Muhammad Aqeel Kamran ◽

Jun Jiang ◽

Jiu-yu Li ◽

Ren-yong Shi ◽

Khalid Mehmood ◽

...

Keyword(s):

Phosphatase Activity ◽

Soil Acidity ◽

Acidic Soils ◽

Olsen P ◽

Amelioration Of Soil Acidity

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Phosphorus Sorption Characteristics of Luvisols and Nitisols in North Ethiopian Soils

Applied and Environmental Soil Science ◽

10.1155/2021/8823852 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Ashebir Getie ◽

Alemayehu Kiflu ◽

Gashaw Meteke

Keyword(s):

Clay Content ◽

Fertilizer Application ◽

Application Rate ◽

Soil Types ◽

Phosphorus Sorption ◽

Sorption Data ◽

P Sorption ◽

Fertilizer Application Rate ◽

P Fertilizer ◽

Sorption Parameters

Crop response to phosphorus (P) application is often erratic in most acidic soil types. The main processes for P losses from agricultural fields are fixation, crop removal, erosion, surface runoff, and subsurface leaching. The purpose of this experiment was to evaluate adsorption properties of selected soils, determine the external phosphorous requirements (EPRs) of the soils, and identify factors contributing to P sorption in two soils in North Ethiopia. In this experiment, separately weighed 1 g soil samples were equilibrated with KH2PO4 at rates of 0.5, 5, 10, 20, 30, 40, and 50 mg PL−1. The P sorption data were fitted well with both Langmuir and Freundlich models with average r2 values of 0.91 and 0.88, respectively. The adsorption maximum (Xm) of the Langmuir isotherm ranged from 588.20 mg P kg−1 soil in Luvisols to 833.3 mg P kg−1 soil in Nitisols. The EPRL values ranged between 86.20 to 93.28 mg P kg−1 for soils of the study area. Among the soil properties, clay content and Ex. Al were positively correlated with Xm. The path analysis revealed that clay, pH, and Av. P had a direct effect on P sorption parameters. The EPRL of the studied soils was 3.44 to 3.6 times greater than the blanket P fertilizer rate recommendation. It is concluded that P sorption models can effectively be used to discriminate soils based on P fixation ability. The result further indicates that the current P fertilizer application rate of 50 kg P ha−1 being practiced across all soil types should be revised after validating the models and EPR values estimated in this study for each soil both under greenhouse and in-the-field conditions.

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

Sains Tanah - Journal of Soil Science and Agroclimatology ◽

10.20961/stjssa.v18i2.51325 ◽

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

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 KH2PO4 in 0.01 M CaCl2, having 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, and 330 mg P L-1 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, Al2O3, and Fe2O3 oxides have affected phosphorus-sorption at a significance level of (P < 0.05). Alisols had the highest Kf value (413 mg kg-1) but Nitisols had the lowest Kf (280 mg kg-1). The external phosphorus fertilizer requirement of the soils was in the order of 25, 30, 32, and 26 mg P kg-1 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 fertilizer for crop production.

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

SAARC Journal of Agriculture ◽

10.3329/sja.v14i1.29549 ◽

2016 ◽

Vol 14 (1) ◽

pp. 1-9 ◽

Cited By ~ 1

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)

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Dung decomposition in temperate dairy pastures. II. Contribution to plant-available soil phosphorus

Soil Research ◽

10.1071/sr03009 ◽

2004 ◽

Vol 42 (1) ◽

pp. 115 ◽

Cited By ~ 19

Author(s):

S. R. Aarons ◽

H. M. Hosseini ◽

L. Dorling ◽

C. J. P. Gourley

Keyword(s):

Organic P ◽

High Input ◽

Soil P ◽

Olsen P ◽

P Sorption ◽

P Pools ◽

Microbial P ◽

Total P ◽

Extractable Soil ◽

Inorganic And Organic

Changes in dung and soil inorganic and organic P pools were measured in an experiment investigating the effects of dung on soil properties in 2 grazed dairy pasture systems (low and high input). Total dung P and bicarbonate-extractable P pools were measured in decomposing pads and compared with the changes in inorganic and organic bicarbonate-extractable soil P, P sorption, and microbial P flush of soils beneath dung pads and control 'pads' where nothing was applied. Bicarbonate-extractable total P in the dung pads declined to the same level in both systems by the last sample date. Organic P comprised a similar proportion (36%) of the bicarbonate-extractable total P pool in dung from both low and high input systems. However, the transformations of dung P were different in each system, with the bicarbonate-extractable total P in the low input dung increasing by 25% before declining, and a greater decrease in percentage bicarbonate-extractable organic P in this system.Bicarbonate-extractable soil organic P did not vary under dung pads despite the large increases in Olsen and Colwell P observed. Soil Olsen P trends observed in the low and high input systems indicate a potential for leaching losses of P in high input systems compared with low. This increase in soil Olsen P was not due to decreased P sorption as dung did not reduce the sorption capacity of the soil. Microbial soil P increased under dung pads only after 60 days in this experiment. Neither the organic P nor microbial P pools contributed significantly to soil labile P pools in these temperate dairy pasture systems. The transformations of P thought to occur during the decomposition of dung are discussed.

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Development of a Novel Model of Soil Legacy P Assessment for Calcareous and Acidic Soils

Frontiers in Environmental Science ◽

10.3389/fenvs.2020.621833 ◽

2021 ◽

Vol 8 ◽

Author(s):

Wenjia Yu ◽

Guohua Li ◽

Tobias Edward Hartmann ◽

Minggang Xu ◽

Xueyun Yang ◽

...

Keyword(s):

Fertilizer Application ◽

P Uptake ◽

Acidic Soils ◽

Simulation Accuracy ◽

Contrast Model ◽

Soil P ◽

Olsen P ◽

Soil Legacy ◽

P Fertilizer

Phosphate (P) rock is a finite natural resource, and its use for P fertilizer production has resulted in its rapid depletion worldwide. In order to reduce the use of natural P resources, reducing the input of P into agricultural systems is necessary. The assessment of legacy P in soil is an option to maintain crop yield with low P fertilizer input. Many models have been tested to assess the contribution of legacy soil P to crop uptake. However, these models face a common challenge as conceptual soil P pools in models cannot be accurately initiated and evaluated using measured soil P indexes. In this study, a novel legacy P assessment (LePA) model was developed according to empirical equations about crop P uptake, soil Olsen-P, and total P from two long-term fertilizer experiments in typical calcareous and acidic soils in China. We used the DPPS (dynamic phosphorus pool simulator) model as a contrast model to estimate the simulation accuracy of the new LePA model. The calibration and validation datasets for both models were set-up by collecting data from two long-term fertilizer experiments in typical calcareous and acidic soils in China. The results showed that the LePA model simulated crop P uptake similar to the DPPS model in calcareous soil. While the DPPS model failed to depict crop P uptake under low pH conditions, the LePA model worked well after modification when limited crop growth caused by acidic conditions was considered. Moreover, the LePA model can also predict changes in soil TP and Olsen-P with P fertilizer application, which are new functions compared with the DPPS model. Based on a scenario analysis generated by the LePA model, P fertilizer application could be reduced by 52% in Yangling and 46% in Qiyang compared with the conventional application rate during this period to maintain the current yields if soil legacy P can be utilized efficiently. The LePA model is a useful tool for guiding soil P management from the field to country scales.

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