Comparative Evaluation of Phosphate Spectrophotometric Methods in Soil Test Phosphorus Extracting Solutions

Miller, Anthony P.; Arai, Yuji

doi:10.2136/sssaj2016.08.0256n

Cited by 21 publications

(18 citation statements)

References 28 publications

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“…Accordingly, the TOP fraction was a difference between TP and TIP. For this IP fractionation analysis, a modified Asher method (Miller & Arai, 2016) was used to avoid overquantifying the concentration of phosphate from the acid hydrolysis reaction of organic P species. In this analysis, four operationally defined IP groups were extracted via a sequential extraction method: (a) soluble P extracted by ammonium chloride, (b) nonoccluded P extracted by sodium hydroxide and sodium chloride, (c) Fe-occluded P extracted by the bicarbonate-citrate-dithionate method, and (d) Ca-P extracted by hydrochloric acid.…”

Section: Total P Fractionation and Inorganic P Fractionationmentioning

confidence: 99%

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Intensive agricultural management‐induced subsurface accumulation of labile phosphorus in Midwestern agricultural soils dominated by tile lines

Gentry

Chen

et al. 2020

Soil Science Soc of Amer J

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In addition to surface runoff, subsurface P loss through tile lines in agricultural lands has received attention over the last decade. It is not clearly understood how this strong ligand, phosphate, is distributed in subsoils (≤180 cm), contributing to subsurface P loss. We hypothesized that subsurface accumulation of labile P as a result of long‐term intensive agricultural management contributes to subsurface P loss. The depth sequence distribution of P and its speciation and reactivity were investigated in tile‐line‐dominated Midwestern agricultural fields via chemical extraction and digestion, batch desorption experiments, and X‐ray absorption near‐edge structure spectroscopy. The results suggest that labile P in subsoils exceeds the eutrophication‐inducing level (>0.01 mg L–1). Because of intensive agricultural management, total P was ∼400 mg kg–1 in surface soils and ∼200‐300 mg kg–1 in subsoils. The depth sequence distribution of P indicated the translocation of P to subsoils. Although phosphate and phytic acid adsorbed by Al or Fe (oxyhydro)oxides and calcite were found in surface soils, phosphate adsorbed to calcite, hydroxyapatite, or both were the dominant P species in subsoils. Phosphate was highest in surface soils and decreased sharply with increasing depth. Slightly alkaline soil in subsoils suppressed the release of P but the process was continuous after 30 d. Subsurface P loss was influenced by the dissolution and desorption process of inorganic P phases and preferentially transported P from surface soils. Subsurface P loss should be considered in strategies to reduce agricultural P loss in the Gulf of Mexico.

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Section: Total P Fractionation and Inorganic P Fractionationmentioning

confidence: 99%

“…The replaced supernatants were then filtrated through 0.2-μm polyvinylidene difluoride filters. The filtrate was analyzed for dissolved phosphate via the modified molybdenum blue method (He, Baligar, Ritchey, & Martens, 1998;Miller & Arai, 2016).…”

Section: Long-term P Desorptionmentioning

confidence: 99%

Intensive agricultural management‐induced subsurface accumulation of labile phosphorus in Midwestern agricultural soils dominated by tile lines

Gentry

Chen

et al. 2020

Soil Science Soc of Amer J

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“…Soil physicochemical properties, including soil pH water 80 , total base saturation 81 , total exchange capacity 82 , organic matter 83 , organic C 84 , and total and organic P 85 were characterized. The total P and organic P concentrations were determined colorimetrically, using the molybdate blue method 86 and the modified Asher molybdate blue method 87 , respectively. All chemicals used in this study were of the American Chemical Society (ACS) grade.…”

Section: Methodsmentioning

confidence: 99%

Nitrogen species specific phosphorus mineralization in temperate floodplain soils

Arenberg

Arai

2021

Sci Rep

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As an essential component of enzymes, higher N availability from agricultural runoff to forest soils may boost the activity of phosphatase, increasing the bioavailability of phosphate. The objective of this study was to evaluate P mineralization rates in temperate floodplain soils as a function of inorganic N species (i.e., ammonium and nitrate) and amendment rate (1.5–3.5 g N kg−1). Accordingly, the soil was amended with nitrate and ammonium, and P dynamics were monitored during a 40-day incubation. The addition of ammonium significantly boosted acid and alkaline phosphatase activity by 1.39 and 1.44 µmol p-nitrophenol P (pNP) g−1 h−1, respectively. The degree of increase was positively correlated with the amendment rate. Likewise, the P mineralization rate increased by 0.27 mg P kg−1 in the 3.5 g N kg−1 ammonium treatment. 31P nuclear magnetic resonance spectroscopic analysis further supported the reduction in organic orthophosphate diesters on day 30. Meanwhile, the addition of nitrate promoted P mineralization to a lesser degree but did not increase phosphatase activity. While floodplain soils have great potential to sequester anthropogenic P, high availability of inorganic N, especially ammonium, could promote P mineralization, potentially increasing P fertility and/or reducing P the sequestration capacity of floodplain soils.

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“…Plant available phosphorus (P) and exchangeable potassium (K) were extracted from 1 g air-dried fine soil (<2 mm) using Bray 2 solution, the reagents being 0.1 M HCl and 0.03 M NH4F (Bray and Kurtz, 1945). K was determined using flame-photometry, and P measured calorimetrically at 882 nm (Miller and Arai, 2016) after reaction with ammonium molybdate and development of the 'Molybdenum (Mo) Blue' colour (within 30 min. ).…”

Section: Soil Sampling Preparation and Analysesmentioning

confidence: 99%

Nitrogen availability determines the long-term impact of land-use change on soil carbon stocks in grasslands of southern Ghana

Nyameasem¹,

Reinsch²,

Taube³

et al. 2020

Preprint

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Abstract. Enhancing the capacity of agricultural soils to resist soil degradation and to mitigate climate change requires long-term assessments of land-use systems. Such long-term evaluations, particularly regarding low-input livestock systems, are limited. This study evaluated the impact of long-term land-use practices, condensed tannins (CT) and soil nutrient status on carbon cycling in arable and permanent systems of a tropical Savannah. Soil samples were taken (0–30 cm depth) from arable crop fields, grazed-seeded grassland, cut-use permanent crops and native grassland. Soil organic carbon (SOC) stocks ranged from 19.9 to 36.8 Mg SOC ha−1 (mean ± sd = 32.9 ± 0.2 Mg ha−1). SOC stocks were lower for grazed-seeded grassland relative to cut-use grass, legume trees and shrubs. Within sown systems, nitrogen availability seemed to be the most critical factor that determines the fate of the SOC stocks, with soil nitrogen (N) concentration and the SOC being highly correlated (r = 0.90; p

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Comparative Evaluation of Phosphate Spectrophotometric Methods in Soil Test Phosphorus Extracting Solutions

Cited by 21 publications

References 28 publications

Intensive agricultural management‐induced subsurface accumulation of labile phosphorus in Midwestern agricultural soils dominated by tile lines

Intensive agricultural management‐induced subsurface accumulation of labile phosphorus in Midwestern agricultural soils dominated by tile lines

Nitrogen species specific phosphorus mineralization in temperate floodplain soils

Nitrogen availability determines the long-term impact of land-use change on soil carbon stocks in grasslands of southern Ghana

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