Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa

González-Rodríguez, Sara; Fernández-Marcos, María Luisa

doi:10.7717/peerj.5820

Cited by 14 publications

(8 citation statements)

References 37 publications

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“…The specific surface area of soil aggregates explains why soil aggregates 0.25–0.15 mm in size showed the weakest capacity to adsorb P, whereas those 0.10–0.05 mm and <0.05 mm in size showed a relatively high capacity for P sorption. In addition, the K F and n values caused soil aggregates <0.05 mm in size to adsorb the most P and release the least P, as well as those 0.25–0.15 mm in size to adsorb the least P and release the most P. These patterns in P sorption and desorption are supported by the results observed in Silandic Andosol and Vitric Andosol soils in Equatorial Africa (Gonzalez‐Rodriguez & Fernandez‐Marcos, 2018). Compared to soils with higher concentrations of added P, those with lower concentrations were characterized by fast sorption.…”

Section: Discussionsupporting

confidence: 64%

“…addition, the K F and n values caused soil aggregates <0.05 mm in size to adsorb the most P and release the least P, as well as those 0.25-0.15 mm in size to adsorb the least P and release the most P. These patterns in P sorption and desorption are supported by the results observed in Silandic Andosol and Vitric Andosol soils in Equatorial Africa(Gonzalez-Rodriguez & Fernandez-Marcos, 2018). Compared to soils with higher concentrations of added P, those with lower T A B L E 3 Slope of P sorption and desorption 0-1 mg L À1 P adding = 1-10 mg L À1 P desorption time = 1-3 hr P desorption time = 3-6 hr…”

supporting

confidence: 68%

“…For instance, P sorption and desorption in soil allow us to quantify the impact of potentially eroded topsoil particles on P concentration in watercourses (Borovec & Jan, 2018). Furthermore, strong P sorption and desorption in soils have been serious limiting factors for plant growth (Gonzalez-Rodriguez & Fernandez-Marcos, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of phosphorus sorption/desorption by soil aggregates in a long‐term revegetation desert ecosystem

Ren

et al. 2022

Land Degrad Dev

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Elucidating the kinetics of phosphorus (P) sorption and desorption in soil aggregates of different sizes has important implications for the regulation of plant growth and development in revegetation desert ecosystems. In this study, the Freundlich models were used to describe the kinetics of P sorption and desorption by soil aggregates of five sizes (0.5–0.25, 0.25–0.15, 0.15–0.10, 0.10–0.05 and <0.05 mm) in a long‐term revegetation desert ecosystem. The results showed that long‐term (>65 years) revegetation significantly improved the properties of desert soil in terms of P fractions (p < 0.05), soil bulk density (p < 0.05), and soil type. The Freundlich models well‐described P sorption and desorption by soil aggregates in the revegetated desert. Soil aggregates of 0.25–0.15 mm adsorbed the lowest amount of P (P adsorbed: KF = 0.26, n = 0.97) but desorbed the highest amount of P (P desorbed: KF = 2.41, n = −0.97). Soil aggregates of <0.05 mm adsorbed the most P (P adsorbed: KF = 0.60, n = 0.85) but desorbed the lowest P (P desorbed: KF = 1.67, n = −1.00). Furthermore, P sorption was fastest when the added P was 0–1.0 mg L−1, and P desorption was fastest at 1–3 hr. Soil aggregates that were 0.25–0.15 mm in size had the highest mass proportion in the long‐term revegetation desert and played a key role in supporting available P for plant development. Soil aggregates of <0.05 mm adsorbed the most P; however, their contribution was constrained because they had the smallest mass proportion and the lowest amount of P desorption.

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Section: Discussionsupporting

confidence: 64%

supporting

confidence: 68%

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Kinetics of phosphorus sorption/desorption by soil aggregates in a long‐term revegetation desert ecosystem

Ren

et al. 2022

Land Degrad Dev

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“…Both soils showed high and hardly reversible phosphate sorption, somewhat higher in the Silandic Andosol [64]. The phosphate sorption isotherms conformed to the Temkin model.…”

Section: Soilssupporting

confidence: 55%

Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

González-Rodríguez

Fernández-Marcos

2021

Soil Systems

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Sorption of oxyanions by soils and mineral surfaces is of interest due to their role as nutrients or pollutants. Volcanic soils are variable charge soils, rich in active forms of aluminum and iron, and capable of sorbing anions. Sorption and desorption of vanadate, arsenate, and chromate by two African andosols was studied in laboratory experiments. Sorption isotherms were determined by equilibrating at 293 K soil samples with oxyanion solutions of concentrations between 0 and 100 mg L−1 V, As, or Cr, equivalent to 0−2.0 mmol V L−1, 0−1.3 mmol As L−1, and 0−1.9 mmol Cr L−1, in NaNO3; V, As, or Cr were determined by ICP-mass spectrometry in the equilibrium solution. After sorption, the soil samples were equilibrated with 0.02 M NaNO3 to study desorption. The isotherms were adjusted to mathematical models. After desorption with NaNO3, desorption experiments were carried out with a 1 mM phosphate. The sorption of vanadate and arsenate was greater than 90% of the amount added, while the chromate sorption was much lower (19–97%). The sorption by the Silandic Andosol is attributed to non-crystalline Fe and Al, while in the Vitric Andosol, crystalline iron species play a relevant role. The V and Cr sorption isotherms fitted to the Freundlich model, while the As sorption isotherms conformed to the Temkin model. For the highest concentrations of oxyanions in the equilibrating solution, the sorbed concentrations were 37–38 mmol V kg−1, 25 mmol As kg−1, and 7.2–8.8 mmol Cr kg−1. The desorption was low for V and As and high for Cr. The comparison of the sorption and desorption isotherms reveals a pronounced hysteresis for V in both andosols and for Cr in the Silandic Andosol. Phosphate induced almost no V desorption, moderate As desorption, and considerable Cr desorption.

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“…According to several authors (Alvarado, 1982;Gonzalez-Rodriguez and Fernandez-Marcos, 2018;Hashimoto et al, 2012;Montalvo et al, 2015;Nanzyo et al, 1993a), the major limiting factor for agricultural production in andosols is a very high phosphate fixation capacity. Actually, the percentage of phosphate retention is a classification criterion for defining andosols (Shoji, 1985).…”

Section: Chapter 1 General Introductionmentioning

confidence: 99%

Fertilizer interactions with micronutrients in tropical volcanic soils

Corrales¹

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Background information for the development of this research:Around the year 2010, we studied nutrient management for papaya (Carica papaya L.) production systems in Costa Rica. The main reason to study these production systems was that papaya is principally grown by small farmers in Costa Rica, who generally operated under low input conditions and limited technical assistance. In addition, there was a general lack of essential information about the correct management of this crop. Firstly, we characterized the nutrient uptake for a high-yielding papaya hybrid (Figure 1.1) . As a result, we found that papaya absorbed amounts of nutrients that exceed the quantities typically applied by farmers, and the fertilizer amounts previously applied were not compensating for total plant nutrient uptake. The application of lower quantities of fertilizer compared to the plant nutrient uptake have several consequences for growers and for the soil system, for instance low productivity per unit area, and depletion of nutrients. Additionally, the nutrient management in papaya production systems is difficult because of the variation of the nutrient requirements over time. Papaya nutrient uptake is concentrated in short periods of time (Figure 1.1), which complicates the correct supply of highly demanded nutrients according to their uptake by the plant. Excessive input of a specific fertilizer in the soil could produce side effects like competition with other ions and increased leaching rates.According to previous observations of the high nutrient demand for the papaya production systems, the growers have increased the addition of fertilizer rates (basically N-P-K) considerably, but this decision lacked agronomical and environmental evidence that justify this practice. Consequently, we have developed field experiments to evaluate the agronomical effects (possible decreasing of yield gaps) of the application of increased N and K fertilizer rates in papaya. The results of this experiment for a dystric volcanic soil are shown in Figure 1.2. From these experiments we observed a noticeable increase in the number of fruits per plant when adding high rates of N and K. These results thus support the use of high fertilizer rates in papaya production systems.The decision to apply increased fertilizer rates for papaya production systems, however, did not consider the environmental consequences of the movement of concentrated solutions through these soils mainly because the possible consequences were not completely understood. Concerned about potential environmental implications due to increased nutrient management in papaya production systems, we realized that the addition of high fertilizer rates is a common practice in other large-scale agricultural production systems and is common for intensive production systems developed in permeable volcanic soils.For instance, more than 43.000 hectares are currently cultivated with bananas in Costa Rica (CORBANA, 2022), receiving high rates of N-P-K fertilizers to account for the high yields required by...

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Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa

Cited by 14 publications

References 37 publications

Kinetics of phosphorus sorption/desorption by soil aggregates in a long‐term revegetation desert ecosystem

Kinetics of phosphorus sorption/desorption by soil aggregates in a long‐term revegetation desert ecosystem

Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

Fertilizer interactions with micronutrients in tropical volcanic soils

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