The Olsen P method as an agronomic and environmental test for predicting phosphate release from acid soils

Horta, Carmo; Torrent, J.

doi:10.1007/s10705-006-9066-2

Cited by 111 publications

(47 citation statements)

References 29 publications

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“…Available P index in soil increases with agricultural land use, reaching mean P content of 17 mg kg -1 (11-27 mg kg -1 ) in grassland soils and 69 mg kg -1 (26-122 mg kg -1 ) in cultivated land. The mean Olsen P in cultivated land was higher than the conservative threshold value (20 mg kg -1 ) for environmental purposes according to Horta and Torrent (2007).…”

Section: Study Area Descriptionmentioning

confidence: 80%

Phosphorus Loss from a Mixed Land Use Catchment in Northwest Spain

2013

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This work examined P loss from a mixed land use catchment in northwest Spain and how it was related to hydrological factors. A stream draining a mixed land use catchment of 16 km in northwest Spain was monitored for 5 yr. Water samples were taken more frequently with increased stream flows. A total of 132 runoff events of different magnitudes were analyzed in this study. Mean annual P loss from the catchment was 11.5 kg km, about 68% being transported during runoff events, which only contributed to 29% of the flow. The contribution of runoff events to particulate P and dissolved P losses was 76 and 46% of total losses during the study period, respectively. A high interannual variability in P loss was observed, the differences being related to rainfall amount and distribution. At a seasonal scale, the highest P loads and concentrations were observed during rainy seasons; the lowest P loads occurred in summer because they occurred with stream flow. Particulate P accounted for the greatest proportion (74%) of transported P. There was a high variability in P transported between runoff events, with maximum discharge and discharge increase being the most important variables explaining total P concentration in these events through their effect on suspended sediment concentration.

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Section: Study Area Descriptionmentioning

confidence: 80%

Phosphorus Loss from a Mixed Land Use Catchment in Northwest Spain

2013

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“…Soil pH was measured by using a calibrated pH meter. As an estimate of plant-available phosphorus (Pa), the Olsen P method [29,30], which is based on extraction with 0.5 M sodium bicarbonate, was applied. Salt-exchangeable potassium (K ex ) was measured by an extraction of ammonium acetate in a spectrophotometer.…”

Section: Soil Samplingmentioning

confidence: 99%

Vegetation Succession on Degraded Sites in the Pomacochas Basin (Amazonas, N Peru)—Ecological Options for Forest Restoration

Walentowski¹,

Heinrichs

Hohnwald³

et al. 2018

Sustainability

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Abstract:The Andes of northern Peru are still widely covered with forests, but increasingly suffer from habitat fragmentation. Subsequent soil degradation often leads to the abandonment of overused forests and pastures. Ecological knowledge on the restoration potential, e.g., on dependencies of soil conditions and altitude, is scarce. Therefore, we compared soil and vegetation patterns along nine transects within the upper Pomacochas Basin, which is an important biodiversity corridor along the Andes, between remaining forests, succession sites and pastures. Anthropogenic successional and disturbance levels, geological substrate, and altitude have the most important ecological impacts on vegetation and tree species composition. Species responded to sandstone versus calcareous substrates, but also to depths of the organic soil layer, and light conditions. The absence of organic layers under pastures contrasted with the accumulation of thick organic layers under forest cover. Vegetation composition at succession sites revealed certain starting points (herbal stage, bush stage, or secondary forest) for restoration that will determine the length of regeneration paths. Pre-forest patches of Alchornea sp. and Parathesis sp. may act as habitat stepping stones for expeditiously restoring biocorridors for wildlife. The key findings can contribute to the sustainable use and conservation of biodiversity in a fragile ecoregion.

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“…, 1995; Torrent, 1997; Borggaard et al. , 2004; Horta & Torrent, 2007a). In developed countries and in intensive crop systems, fertilizers are usually applied above plant needs and soil P sorption capacity (Torrent et al.…”

Section: Introductionmentioning

confidence: 99%

“…Phosphorus (P) is an essential nutrient of living organisms and therefore essential in food production. Higher plants absorb P in the form of phosphate, whose concentration in the soil solution is governed by P sorption ⁄ desorption reactions, dependent in turn on the properties of solid phase and the amount of P sorbed (Gerke & Hermann, 1992;Matar et al, 1992;Frossard et al, 1995;Torrent, 1997;Borggaard et al, 2004;Horta & Torrent, 2007a). In developed countries and in intensive crop systems, fertilizers are usually applied above plant needs and soil P sorption capacity (Torrent et al, 2007), which results in an increase of the risk of P loss to water (Sibbesen & Runge-Metzger, 1995) and the depletion of the non-renewable phosphate natural resources.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus sorption and desorption properties of soils developed on basic rocks under a subhumid Mediterranean climate

Horta

Monteiro

Madeira

et al. 2012

Soil Use and Management

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Representative samples of A, B and C horizons from 11 pedons (Luvisols, Solonetzs and Cambisols) developed on intermediate and basic rocks were studied regarding evaluation of phosphorus (P) behaviour, with the aim of delineating site‐specific management practices. For this purpose, (i) sorption properties were evaluated by Langmuir and Freundlich isotherms, (ii) soil samples were fertilized to a level of ca. 0.5 mg P/L, estimated by the Freundlich isotherm fitted to each horizon and (iii) the amount of phosphate‐P desorbed to a dilute electrolyte mimicking fresh water over periods of up to 60 days at soil:solution ratios of 1:100, 1:1000 and 1:10 000 was measured. The pedons had a slightly acidic or alkaline reaction and a limited capacity to sorb P, sorption seemingly occurring by both adsorption and precipitation. The nature of the sorption processes seemed to change with depth: precipitation dominated in C horizons, adsorption in A horizons and both types of processes being balanced in B horizons. The short‐term capacity of the soil to transfer P to water was related to the sorption curve parameters and the nature of the process seemingly controlling sorption. The ability of soil to desorb P increased with decreasing soil:solution ratio and when precipitation was the dominant process in sorption. After P fertilizer application, soils exhibited a high capacity to transfer P to water, thus making it advisable to use a replacement P strategy to prevent P accumulation in the topsoil and its downward movement.

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The Olsen P method as an agronomic and environmental test for predicting phosphate release from acid soils

Abstract: The role of soil phosphorus (P) in the eutrophication of fresh water systems is well established. It is crucial therefore to assess the potential loss of P from soil in the various scenarios where soil can come into contact with water. To date, such assessment

Cited by 111 publications

References 29 publications

Phosphorus Loss from a Mixed Land Use Catchment in Northwest Spain

Phosphorus Loss from a Mixed Land Use Catchment in Northwest Spain

Vegetation Succession on Degraded Sites in the Pomacochas Basin (Amazonas, N Peru)—Ecological Options for Forest Restoration

Phosphorus sorption and desorption properties of soils developed on basic rocks under a subhumid Mediterranean climate

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