RESIDUAL PHOSPHORUS SOLUBILITY FOR AN ACID, CLAYEY, FORESTED SOIL IN THE PRESENCE OF OXALATE AND CITRATE

1989 ◽  
Vol 69 (1) ◽  
pp. 111-117 ◽  
Author(s):  
N. B. COMERFORD ◽  
M. F. SKINNER
Keyword(s):  
Key Words ◽  
Pinus Radiata ◽  
Clayey Soil ◽  
Organic Anion ◽  
Sorption Isotherms ◽  
Organic P ◽  
Soil Material ◽  
Residual P ◽  
Residual Phosphorus ◽  
P Sorption

A highly weathered, clayey soil was sampled 14 yr after a Pinus radiata stand was broadcast fertilized with 0, 50 and 200 kg P ha−1 as ordinary superphosphate. Incremental loadings of oxalate and citrate anions from 10 to 100 μmol of anion g−1 soil were evaluated for increased soluble, reactive P (SRP) and soluble, nonreactive (SNP) P. Sorption isotherms were compared to evaluate the effect of the previous fertilization on P sorption by the soil material sampled, and also to measure SNP displacement by orthophosphate-P. A portion of the SNP pool was more readily released than SRP and orthophosphate displaced a significant amount of SNP. After 14 yr the effect of fertilization was still obvious in the sampled soil material. Much of the organic anion-soluble P was in the SRP form. Key words: Citrate, organic P, orthophosphate, oxalate, Pinus radiata, residual P

CHANGES WITH TIME IN THE FORM AND AVAILABILITY OF RESIDUAL FERTILIZER PHOSPHORUS ON CHERNOZEMIC SOILS

1986 ◽  
Vol 66 (1) ◽  
pp. 105-119 ◽  
Author(s):  
B. I. WAGAR ◽  
J. W. B. STEWART ◽  
J. O. MOIR
Keyword(s):  
Key Words ◽  
Organic P ◽  
Clay Loam ◽  
P Fractionation ◽  
Residual P ◽  
Fractionation Procedure ◽  
P Fertilizer ◽  
Labile P ◽  
P Transformations ◽  
Stable Forms

A sequential phosphorus (P) fractionation procedure was used to measure the changes in the labile and stable forms of inorganic and organic P following single broadcast P applications to Canadian Chernozemic soils under cereal cropping. Approximately half of the fertilizer residues remained in plant-available forms (resin, NaHCO3). In a Black Waskada clay loam 8 yr after the application of 200 and 400 kg P ha−1, residual fertilizer P consisted of resin-P, 30–40%; HCl-P, 25–30%; residue-P, 10–15%; NaOH-P, 10–15%, NaHCO3-P, 10%; and aggregate protected P, 3%. The residues in a Dark Brown Sutherland clay 5 yr after the application of 160 kg P ha−1 were: resin-P, 35%; NaOH-P, 30–40%; NaHCO3-P, 15%; HCl-P, 0–5%; H2SO4-P, 5%; and aggregate protected P, 5%. The soils differed in the quantity of fertilizer recovered in inorganic HCl-extractable forms. In the Sutherland soil the change from wheat-fallow to continuous wheat cropping produced a build-up of organic P which occurred with and without the addition of P fertilizer. Key words: Residual P, P transformations, Labile Pi; labile Po, stable Pi stable Po

Fate of applied phosphorus in an effluent-irrigated Pinus radiata plantation

Soil Research ◽  
1999 ◽  
Vol 37 (6) ◽  
pp. 1095 ◽  
Author(s):  
R. A. Falkiner ◽  
P. J. Polglase
Keyword(s):  
Pinus Radiata ◽  
Sorption Isotherms ◽  
Average Concentration ◽  
Organic P ◽  
Retention Capacity ◽  
Inorganic P ◽  
Eastern Australia ◽  
Soil Irrigation ◽  
And Migration ◽  
Total P

We examined the fate of applied phosphorus (P) in a young Pinus radiata plantation in south-eastern Australia, spray-irrigated with secondary-treated municipal effluent. Measurements included changes (before irrigation, and after 5 years) in total P, total organic P, total inorganic P, labile P, and sorption and desorption characteristics. During the first 5 years a total of 363 kg/ha of P was applied at an average concentration of 5.4 mg/L. Irrigation changed the forms and distribution of P throughout the profile (0–1 m). Increases in labile inorganic P (membrane-exchangeable, bicarbonate-extractable, and in soil solution) were confined mostly to the 0–0.5 m horizon, and wholly within the 0–0.7 m horizon. In addition, large amounts of organic P (204 kg/ha) were mineralised within the surface 0.7 m, due to stimulation of decomposer activity by increased soil water. Mineralisation, therefore, provided a significant and additional input of inorganic P to soil. Irrigation and P additions changed both the placement and curvature of soil sorption isotherms. Retention capacity (0–0.5 m), calculated from P sorption isotherms, decreased by 180 kg/ha. Desorbable P, determined by sequential extraction with dilute acid, increased by 184 kg/ha. Thus, these 2 independent methods of measuring the changes in exchangeable P gave the same result. Of the total inorganic P added to the soil (in effluent and mineralised), 25% remained in the exchangeable form; the rest was retained unavailable for short-term exchange and migration through soil. After 5 years, fluxes (kg/ha) of P in the 0–0.7 m horizon were: input in effluent less storage in vegetation (323), change in total organic P (–204), change in total inorganic P (517), net change in total P (313). Thus, 97% of the net amount of P added in effluent was recovered in the surface 0.7 m. Results have implications for the way in which P retention capacity is calculated under effluent irrigation.

A comparison of some surface soil phosphorus tests that could be used to assess P export potential

Soil Research ◽  
2007 ◽  
Vol 45 (5) ◽  
pp. 397 ◽  
Author(s):  
David Nash ◽  
Murray Hannah ◽  
Kirsten Barlow ◽  
Fiona Robertson ◽  
Nicole Mathers ◽  
...  
Keyword(s):  
Organic P ◽  
Soil Tests ◽  
Soil P ◽  
Olsen P ◽  
P Sorption ◽  
P Loss ◽  
Extractable P ◽  
Soil P Tests ◽  
Total P ◽  
Water Extractable

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.

Phosphorus K-edge XANES spectroscopy has probably often underestimated iron oxyhydroxide-bound P in soils

2018 ◽  
Vol 25 (6) ◽  
pp. 1736-1744 ◽  
Author(s):  
Jörg Prietzel ◽  
Wantana Klysubun
Keyword(s):  
Linear Combination ◽  
Xanes Spectroscopy ◽  
Organic P ◽  
Iron Oxyhydroxide ◽  
Edge Structure ◽  
X Ray ◽  
Soil P ◽  
P Sorption ◽  
Fe Oxyhydroxides ◽  
X Ray Absorption

Phosphorus (P) K-edge X-ray absorption near-edge structure (XANES) spectra of orthophosphate (oPO4) bound to soil FeIII minerals (e.g. ferrihydrite, goethite) show a pre-edge signal at 2148–2152 eV. It is unknown whether organic P bound to FeIII oxyhydroxides also show this feature. Otherwise, Fe-bound soil P may be underestimated by P K-edge XANES spectroscopy, because a large portion of Fe oxyhydroxide-bound P in soils is organic P. K-edge XANES spectra were obtained for different organic P compounds present in soils [inositol hexaphosphate (IHP), glucose-6-phosphate (G6P), adenosine triphosphate (ATP)] after sorption to ferrihydrite or goethite and compared with spectra of oPO4 adsorbed to these minerals. P sorption to ferrihydrite increased in the sequence IHP ≪ G6P < oPO4 < ATP. P sorption to goethite increased in the sequence G6P < oPO4 ≪ ATP = IHP. Pre-edge signals in P K-edge XANES spectra of organic P adsorbed to Fe oxyhydroxides were markedly smaller compared with those of oPO4 adsorbed to these minerals and absent for FeIII oxyhydroxide-bound ATP as well as goethite-bound IHP. Linear combination fitting (LCF) performed on spectra of IHP, G6P or ATP adsorbed to ferrihydrite or goethite, using only spectra of FeIII oxyhydroxide-bound oPO4 as reference compounds for Fe-bound P, erroneously assigned >93% (ferrihydrite) or >41% (goethite) of Fe-bound P to non-Fe-bound P species. Inclusion of FeIII oxyhydroxide-bound IHP as reference compounds markedly increased the recovery of oxyhydroxide-bound organic P. Thus, Fe-bound soil P has probably often been underestimated by LCF in soil XANES studies where IHP adsorbed to ferrihydrite and to goethite were not included as reference compounds.

COMPARISON OF SINGLE LARGE BROADCAST AND SMALL ANNUAL SEED-PLACED PHOSPHORUS TREATMENTS ON YIELD AND PHOSPHORUS AND ZINC CONTENTS OF WHEAT ON CHERNOZEMIC SOILS

1986 ◽  
Vol 66 (2) ◽  
pp. 237-248 ◽  
Author(s):  
B. I. WAGAR ◽  
J. W. B. STEWART ◽  
J. L. HENRY
Keyword(s):  
Key Words ◽  
Zinc Concentration ◽  
Clay Soil ◽  
P Uptake ◽  
Average Yield ◽  
Residual P ◽  
Broadcast Application

Yield and P and Zn contents of wheat from plots on a Dark Brown Chernozemic clay soil which received single broadcast P applications and annual seed-placed P applications were compared in a 6-yr study. Broadcast P applications of 20, 40, 80 and 160 kg P ha−1 increased the average yield by 9, 24, 33 and 35%, respectively. Yearly seed-placed P treatments of 2.5, 5, 10 and 20 kg P ha−1 applied over the first 5 yr of the study increased the average yield by 10, 15, 24 and 29%, respectively. The broadcast application of 40 kg P ha−1 increased yields over 5 yr and had an average yield and P uptake similar to that of the annual seed-placed applications of 10 and 20 kg P ha−1. Broadcasting 80 and 160 kg P ha−1 increased yields over 6 yr. Soil levels of extractable NaHCO3-Pi indicated future increases may occur. Yields from plots receiving consecutive seed-placed P treatments significantly benefited from the P residues of previous seed-placed applications. Plant zinc concentration was significantly reduced by the broadcast application of 160 kg P ha−1 and the seed-placed application of 20 kg P ha−1. Key words: Broadcast P, seed-placed P, residual P, P-Zn interaction

DISTRIBUTION OF CARBON, NITROGEN, SULPHUR AND PHOSPHORUS IN PARTICLE-SIZE SEPARATES FROM GLEYSOLIC SOILS

1980 ◽  
Vol 60 (4) ◽  
pp. 783-786 ◽  
Author(s):  
A. A. HINDS ◽  
L. E. LOWE
Keyword(s):  
Particle Size ◽  
Soil Carbon ◽  
Organic P ◽  
Soil N ◽  
Dispersion Method ◽  
Ultrasonic Dispersion ◽  
Soil Material ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Fine Clay

Levels of C, N, S and organic P (Po) were determined in fine, medium and coarse clay- and silt-size separates obtained from five Gleysolic soils by an ultrasonic dispersion method. Contents of C, N, S and Po increased with decreasing particle size, with average C values increasing from 3.7% in the silt to 10.1% in fine clay fractions. The corresponding increases for N, S and Po were 0.26–1.17%, 0.037–0.178% and 0.043–0.172%, respectively. C/N and C/S ratios decreased with decreasing particle size, indicating a relative enrichment of N and S in the finer particle-size fractions. N/S showed little variation with particle size, while C/Po ratios were erratic. The three clay fractions accounted on average for 31.3% of the soil material, and for 39.1% of soil carbon. In contrast, the clay fractions together accounted on average for 52–59% of soil N, S and Po.

scholarly journals Reviews and Syntheses: Ironing Out Wrinkles in the Soil Phosphorus Cycling Paradigm

2020 ◽  
Author(s):  
Curt A. McConnell ◽  
Jason P. Kaye ◽  
Armen R. Kemanian
Keyword(s):  
Soil Phosphorus ◽  
Phosphorus Cycling ◽  
Organic P ◽  
New Techniques ◽  
Inorganic P ◽  
Soil P ◽  
Plant System ◽  
P Sorption ◽  
P Cycling ◽  
Critical Challenge

Abstract. Soil phosphorus (P) management remains a critical challenge for agriculture worldwide, and yet we are still unable to predict soil P dynamics as confidently as that of carbon (C) or nitrogen (N). This is due to both the complexity of inorganic P (Pi) and organic P (Po) cycling and the methodological constraints that have limited our ability to trace P dynamics in the soil-plant system. In this review we describe the challenges to building parsimonious, accurate, and useful P models and to explore the potential of some new techniques to advance modeling efforts. To advance our understanding and modeling of P biogeochemistry, research efforts should focus on the following: 1) update the McGill and Cole (1981) model of Po mineralization by clarifying the role and prevalence of “biochemical” and “biological” Po mineralization which we hypothesize are not mutually exclusive and may co-occur along a continuum of Po substrate stoichiometry; 2) further understand the dynamics of phytate, a 6-C compound that can regulate the poorly understood stoichiometry of soil P; 3) explore the effects of C and Po saturation on P sorption and Po mineralization; and 4) resolve discrepancies between hypotheses about P cycling and the methods used to test these hypotheses.

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

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

Soil Research ◽  
1990 ◽  
Vol 28 (6) ◽  
pp. 919 ◽  
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.

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.

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