Modelling phosphate adsorption to the soil: Application of the non-ideal competitive adsorption model

Nohra, Joumana S. Abou; Madramootoo, Chandra A.; Hendershot, William H.

doi:10.1016/j.envpol.2006.12.027

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…The chemical and physical properties of the soils used in this study are summarized in Table 1, with more detailed information in Abou Nohra et al (2007), where the same soils were used for a different application.…”

Section: Field Description and Experimental Set-upmentioning

confidence: 99%

Estimating phosphorus leachability in reconstructed soil columns using HYDRUS-1D model

et al. 2011

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Modern agricultural production uses phosphorus (P) extensively to meet the challenges of feeding rapidly growing population and changing lifestyles, making P a leading source of impairment for rivers and streams in Canada. Developing effective management strategies to reduce P losses from agro-ecosystems requires improved understanding of P transport pathways in the soil. The purpose of this study was to investigate vertical distribution and transport processes of phosphate (PO 4 ) in reconstructed soil columns using HYDRUS-1D model. Results obtained from field experiments were used to calibrate and validate the HYDRUS-1D model. The results showed that 98% of the total P applied was concentrated in the top 0.2 m of the columns, and decreased progressively with soil depth. The model over-predicted PO 4 adsorption, leading to a weak correspondence between the simulated and the measured results for PO 4 . This is a suggestion that the HYDRUS-1D model could not account accurately for the different soil structures found in the undisturbed soil columns and the preferential flow that occurs in these columns. This may be due to the fact that Freundlich isotherm, which is part of the transport equations, could not adequately describe PO 4 adsorption onto the soil particles.

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Section: Field Description and Experimental Set-upmentioning

confidence: 99%

Estimating phosphorus leachability in reconstructed soil columns using HYDRUS-1D model

et al. 2011

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“…In a study of sandy soils, a threshold DPS value of 20% is suggested as an indicator of potential of P from field to surface waters through surface runoff or subsurface drainage (Nair et al ., ). Modelling of soil P adsorption using the non‐ideal competitive adsorption model (Abou Nohra et al ., ) and the Langmuir model (Jiao et al ., ) have shown that soils have a high P binding strength site with low binding capacity, and a low P binding strength site with high capacity. The high binding strength site averaged 36% of the total binding sites in these two studies which suggests that with DPS < 8.7% in these blueberry soils, the P found in these soils is bound at the high binding strength sites.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus and aluminium solubility relationships in acidic lowbush blueberry barren soils in Maine

Ohno

Severy

2013

Soil Use and Management

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Lowbush blueberry (Vaccinium angustifolium) is a native plant that is not cultivated, but managed in areas of sufficient plant density to provide commercial yields. A cropping systems study was initiated to compare how organic and three levels of conventional (low, medium and high input) management practices affected soil properties at 12 grower fields in the lowbush blueberry barrens of Maine. The fields under organic and low‐conventional treatments did not receive any fertilizer inputs. The high and medium conventional treatment fields received optimal and reduced diammonium phosphate inputs, respectively. Three measurements of soil P (modified‐Morgan soil test, oxalate extractable and total P) showed no significant effect of management treatment on the phosphorus status of the soils. This suggests that soil P may be leaching below the 0–10 cm rooting zone which was investigated in this study. Equilibrium chemical speciation of soil/water extracts showed that gibbsite was controlling the solubility of Al in these barren soils and that P was undersaturated with respect to amorphous Al(OH)2PO4. A laboratory one‐point P sorption study showed that dissolved organic matter derived from the organic pad sampled from the study sites did not inhibit the adsorption of the added P. This suggests that addition of carbon‐rich soil amendments such as compost may not increase P bioavailability of these acidic soils with high Al (oxy)hydroxide (gibbsite) mineral content.

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“…As for solute (PO 4 ) transport, concentration flux boundary conditions were implemented at the upper boundary, and a zero gradient boundary condition was set at the lower solute boundary condition. The reaction parameters required by the HYDRUS-1D model were derived from the adsorption experiment reported by Abou Nohra et al [14]. The reaction parameters (k d and β) required by the HYDRUS-1D model were derived based on Eq.…”

Section: The Hydrus-1d-flow and Transport Modelmentioning

confidence: 99%

Simulation of Phosphorus Transport in Soil Under Municipal Wastewater Application Using Hydrus-1D

Agah¹,

Meire²,

Deckere³

2016

Soil Contamination - Current Consequences and Further Solutions

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Today, wastewater irrigation is one of the best options to reduce the stress on limited availability of fresh water and to meet the nutrient requirements of crops. In the present study, the simulation accuracy and performance of the HYDRUS-1D model to predict phosphorus leaching have been evaluated and compared to lysimeter data. More specifically, the effects of irrigation using four types of water (wastewater, effluent, mixture of freshwater and effluent, and freshwater) on three types of soil (sandy loam, loam, and clay loam) have been investigated both experimentally and numerically. Barley was planted as a common agricultural crop. The leachates from lysimeters have been collected and sampled at the beginning, middle, and end of the growing season. These samples have then been analyzed for phosphorous. The results show that the trend of change in nutrient concentration (P) was a function of plant requirement. Maximum process of leaching occurred concurrent with minimum plant requirement. The average phosphorus leaching into the root depths turns out to be insignificant, as it amounts to only 0.65-1.65%. This reassuring result means that wastewater with high concentrations of phosphorus compounds (up to 5-10.3 PO 4 -P mgl −1 ) can just be treated through an intermittent application to the land surface. Overall, a good agreement between experimental-and numerical-model results is obtained, wherefore the model overestimates the mean phosphate leaching during the growing season of the crop slightly. On the basis of these results, soil with loamy texture was considered to be the most suitable type for irrigation with wastewater and effluent. The results of this research indicate that with a proper management program in regard to the types of soil to be used, crops to be cultivated, water quality, and timing maneuver, the negative impacts of low quality water on soil/plant/groundwater systems can be minimized.

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Modelling phosphate adsorption to the soil: Application of the non-ideal competitive adsorption model

Cited by 11 publications

References 20 publications

Estimating phosphorus leachability in reconstructed soil columns using HYDRUS-1D model

Estimating phosphorus leachability in reconstructed soil columns using HYDRUS-1D model

Phosphorus and aluminium solubility relationships in acidic lowbush blueberry barren soils in Maine

Simulation of Phosphorus Transport in Soil Under Municipal Wastewater Application Using Hydrus-1D

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