Sorption capacity of phosphate in mineral soils: I Estimation of sorption capacity by means of sorption isotherms

Niskanen, R.

doi:10.23986/afsci.72918

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…Higher soil organic matter content values are associated with more water‐soluble carbon complexes, which also means that more P associated with organic matter may be lost through soil macropores and cracks to the drainage system by means of preferential flow (Tarkalson & Leytem, 2009). On the other hand, soil organic matter is also responsible for P sorption within the profile by means of complex formation (Bloom, 1981; Niskanen, 1990a; Börling et al. , 2001) and formation of amorphous hydroxides (Borggaard et al.…”

Section: Discussionmentioning

confidence: 99%

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Impact of horse grazing and feeding on phosphorus concentrations in soil and drainage water

Parvage

Kirchmann

Kynkäänniemi

et al. 2011

Soil Use and Management

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The number of horses in Sweden has increased, from 77 300 in 1970 to 283 000 in 2003 (ca. 250%). These horses are kept on 300 000 ha, which represents 10% of total agricultural land in Sweden. Maximum recommended livestock density in Sweden is 2.5 units/ha for grazed pasture, but no limits have yet been set for outdoor keeping and feeding areas (paddocks) for horses. This study characterized the potential risk of phosphorus (P) losses from a horse paddock established on a heavy clay soil with a stocking rate of 3.75 livestock units/ha compared with nearby arable land. The horse paddock received 15 kg P/ha/yr and 75 kg N/ha/yr through horse excreta, while annual input of P and N to the adjacent arable land was 13 and 112 kg/ha, respectively. There was no significant difference in water‐soluble P (WSP) in fresh and dried soil samples between the horse paddock (mean values: 0.62 and 0.43 mg/100 g soil; n = 15) and the arable field (mean values: 0.52 and 0.37 mg/100 g soil; n = 5). In contrast, phosphorus extractable in ammonium acetate lactate (extractable P) in the topsoil of the horse paddock (mean: 15 mg/100 g soil) was significantly higher (P = 0.03; n = 15) than in the arable land, whereas total P extracted with nitric acid (total P) showed no statistically significant differences. Furthermore, there was no significant difference in lactate‐extractable iron and aluminium (extractable Fe and Al), organic carbon (C), total nitrogen (N) or phosphorus sorption index between the two parcels of land. However, the degree of P saturation in soil was significantly higher (P = 0.02; n = 15) in the horse paddock. Extractable Al and Fe were highly correlated to extractable P (P < 0.001; n = 69), the correlation being negative for Al. No relationship was found with calcium, but soil C content was found to be correlated with extractable P (P < 0.001; n = 69). Over the past 8 yr, high P concentrations (up to 1.5 mg/L), mainly in dissolved reactive form, have been recorded in drainage water from the grazed catchment. We concluded that horse grazing at high stocking rates (>2.5 livestock units/ha) may pose a risk of high P losses to nearby water bodies.

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Section: Discussionmentioning

confidence: 99%

“…, 2001) and formation of amorphous hydroxides (Borggaard et al. , 1990; Niskanen, 1990a). Organic matter has a pronounced effect on the formation of amorphous Al oxides, which in turn increase P sorption capacity (Niskanen, 1990b; Lookman et al.…”

Section: Discussionmentioning

confidence: 99%

Impact of horse grazing and feeding on phosphorus concentrations in soil and drainage water

Parvage

Kirchmann

Kynkäänniemi

et al. 2011

Soil Use and Management

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“…One factor in sorption capacity is the amorphous aluminium oxide content of the soil (Bloom, 1981;Borggaard et al, 1990;Niskanen, 1990b;Bö rling et al, 2001). Organic matter complexity also seems to have an influence on the ability of the soil to absorb P (Bloom, 1981;Niskanen, 1990a;Bö rling et al, 2001) since organic matter inhibits crystallization of hydrous oxides and thereby increases their reactivity (Niskanen, 1990a;Borggaard et al, 1990). An increase in absorbed anions increases the negative charge at the soil surface (Barrow, 1978).…”

Section: Introductionmentioning

confidence: 95%

A simplified risk assessment for losses of dissolved reactive phosphorus through drainage pipes from agricultural soils

Ulén¹

2006

Acta Agriculturae Scandinavica, Section B - Soil & Plant Sc

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Soil tests with extractions are commonly used for risk assessments of phosphorus (P) leaching. Procedures for routine analysis of crop-available soil P by extraction with acid ammonium lactate (P-AL) have been used for nearly 50 years in Sweden, Norway and several East European countries. Aluminium and iron (Al-AL and Fe-AL) were determined in the same extract for 40 well known clayey, loamy or sandy soils from the Swedish long-term studies. Average outcome was 16.8 and 6.0% for the two elements related to extraction with chelating ammonium oxalate (Al-AO and Fe-AO) and concentrations had a correlation coefficient of 0.947 and 0.891, respectively, when the two extraction agents were compared. On average, P-AL determination using inductive coupled plasma (ICP) resulted in 19% higher soil P concentrations compared to analysis using a colorimetric method based on non-calcareous and calcareous soils from the southern counties in the Swedish soil survey, represented mainly by sandy loam soils. Degree of P saturation on a molar basis in the AL extract (DPS-AL) was determined for 22 Nordic observation fields with drained clayey, loamy and sandy soils. Results were used together with long-term flow-weighed concentration of dissolved reactive P (DRP) concentration in drainage water. These parameters were correlated (r0/0.918, p0/0.000) and could be fitted to a linear regression model (R 2 0/84.3). In addition, two fields with unusually high DPS-AL values could clearly be identified as those with lowest P sorption index and highest DRP concentrations in drainage water. This demonstrates DPS-AL to have the potential as an environmental risk indicator for Swedish acid soils. A set of 230 non-calcareous soils in the southern counties of Sweden from the Swedish soil survey indicated that 3% of the soils had a high DPS-AL in the topsoil or subsoil, from which high DPS leaching probably occurs.

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“…Since soil P availability is less affected by warming‐induced changes in biological processes, but more influenced by abiotic P inputs (Jiao et al, 2016), warming could have negatively affected abiotic P supply pathways. A rise in temperature can directly enhance soil P sorption rates (Barrow, 1983) as well as the migration rate of phosphate into fines pores of hydrous aluminium and iron oxides (Niskanen, 1990), and thereby have dampened abiotic Pi mobilization and reduced P availability in warmed soils. For example, the transformation of secondary P to occluded P is facilitated by warming (Siebers et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Does long‐term soil warming affect microbial element limitation? A test by short‐term assays of microbial growth responses to labile C, N and P additions

Shi

Urbina-Malo

Tian

et al. 2023

Global Change Biology

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Increasing global temperatures have been reported to accelerate soil carbon (C) cycling, but also to promote nitrogen (N) and phosphorus (P) dynamics in terrestrial ecosystems. However, warming can differentially affect ecosystem C, N and P dynamics, potentially intensifying elemental imbalances between soil resources, plants and soil microorganisms. Here, we investigated the effect of long-term soil warming on microbial resource limitation, based on measurements of microbial growth ( 18 O incorporation into DNA) and respiration after C, N and P amendments. Soil samples were taken from two soil depths (0-10, 10-20 cm) in control and warmed (>14 years warming, +4°C) plots in the Achenkirch soil warming experiment. Soils were amended with combinations of glucose-C, inorganic/organic N and inorganic/organic P in a full factorial design, followed by incubation at their respective mean field temperatures for 24 h. Soil microbes were generally C-limited, exhibiting 1.8-fold to 8.8-fold increases in microbial growth upon C addition. Warming consistently caused soil microorganisms to shift from being predominately C limited to become C-P co-limited. This P limitation possibly was due to increased abiotic P immobilization in warmed soils.Microbes further showed stronger growth stimulation under combined glucose and inorganic nutrient amendments compared to organic nutrient additions. This may be related to a prolonged lag phase in organic N (glucosamine) mineralization and utilization compared to glucose. Soil respiration strongly positively responded to all kinds of | 2189 SHI et al.

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Sorption capacity of phosphate in mineral soils: I Estimation of sorption capacity by means of sorption isotherms

Cited by 5 publications

References 16 publications

Impact of horse grazing and feeding on phosphorus concentrations in soil and drainage water

Impact of horse grazing and feeding on phosphorus concentrations in soil and drainage water

A simplified risk assessment for losses of dissolved reactive phosphorus through drainage pipes from agricultural soils

Does long‐term soil warming affect microbial element limitation? A test by short‐term assays of microbial growth responses to labile C, N and P additions

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