Exchangeable Calcium/Magnesium Ratio Affects Phosphorus Behavior in Calcareous Soils

Wadu, Mihiri C.W. Manimel; Michaelis, Vladimir K.; Kroeker, Scott; Akinremi, O. O.

doi:10.2136/sssaj2012.0102

Cited by 29 publications

(22 citation statements)

References 46 publications

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“…Solutions with higher Mg than Ca can have negative implications on soil structure, infiltration, and hydraulic conductivity (Bame et al, 2013;Yilmaz et al, 2005). The ratio between soil Ca and Mg also affects the behaviour of other nutrients such as phosphorous (Manimel Wadu et al, 2013), nitrogen (Favaretto et al, 2012), and copper (Lombini et al, 2003), as well as plant biomass and nutrient accumulation in tissues (Kopsell et al, 2013;Drzewiecka et al, 2014). The soil Ca:Al ratio is an indicator of ecosystem stress as a result of acid deposition and soil infertility.…”

Section: Introductionmentioning

confidence: 99%

Short-term low-severity spring grassland fire impacts on soil extractable elements and soil ratios in Lithuania

Pereira

Cerdà

Martin³

et al. 2017

Science of The Total Environment

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Spring grassland fires are common in boreal areas as a consequence of slash and burn agriculture used to remove dry grass to increase soil nutrient properties and crop production. However, few works have investigated fire impacts on these grassland ecosystems, especially in the immediate period after the fire. The objective of this work was to study the short-term impacts of a spring grassland fire in Lithuania. Four days after the fire we established a 400m sampling grid within the burned area and in an adjacent unburned area with the same topographical, hydrological and pedological characteristics. We collected topsoil samples immediately after the fire (0months), 2, 5, 7 and 9months after the fire. We analysed soil pH, electrical conductivity (EC), major nutrients including calcium (Ca), magnesium (Mg), sodium (Na), and potassium (K), and the minor elements aluminium (Al), manganese (Mn), iron (Fe) and zinc (Zn). We also calculated the soil Na and K adsorption ratio (SPAR), Ca:Mg and Ca:Al. The results showed that this low-severity grassland fire significantly decreased soil pH, Al, and Mn but increased EC, Ca, Mg, and K,. There was no effect on Na, Fe, and Zn. There was a decrease of EC, Ca, Mg, and Na from 0months after the fire until 7months after the fire, with an increase during the last sampling period. Fire did not significantly affect SPAR. Ca:Mg decreased significantly immediately after the fire, but not to critical levels. Ca:Al increased after the fire, reducing the potential effects of Al on plants. Overall, fire impacts were mainly limited to the immediate period after the fire.

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Section: Introductionmentioning

confidence: 99%

Short-term low-severity spring grassland fire impacts on soil extractable elements and soil ratios in Lithuania

Pereira

Cerdà

Martin³

et al. 2017

Science of The Total Environment

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“…In more acidic systems (pH < 7) with less Ca (1-1.5:1 Ca:P), dicalcium phosphate dihydrate, or brushite (DCPD; CaHPO 4 •2H 2 O) is stable. Interestingly, brushite has been observed in fertilized calcareous soils [2][3][4] and there is established and mounting evidence, chiefly in the biomedical field, that brushite is an important HAP precursor for many different geochemical conditions [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Magnesium is a potentially significant cation for complexation and precipitation reactions with P that has largely been omitted from soil P speciation due to the observation that pure Mg phases are much more soluble than Ca-P minerals [4,7]. Nonetheless, magnesium phosphate minerals, such as newberyite (NBTE; MgHPO 4 •3H 2 O) and bobierrite (BOB; Mg 3 (PO 4 ) 2 •8H 2 O) have been identified in systems where there is an abundance of Mg due to amendment applications or parent material [4,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Influences of Magnesium upon Calcium Phosphate Mineral Formation and Structure as Monitored by X-ray and Vibrational Spectroscopy

2020

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Calcium phosphate minerals are typically the solubility-limiting phase for phosphate in calcareous soils. Magnesium (Mg), despite being present in high concentrations in calcareous soils, has been largely neglected in the study of formation and stabilization of soil phosphate minerals due to the high solubility of pure Mg phosphate phases. In this study, a series of four common calcium and magnesium phosphate minerals, hydroxyapatite/bobierrite and brushite/newberyite were synthesized in the presence of widely varying Mg concentrations to examine the effects of Mg substitution upon the local bonding environment and overall structure of the precipitates. Phosphorus K-edge X-Ray absorption near edge structure (XANES) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) provide insight into the local coordination environment, whereas synchrotron powder X-Ray diffraction (SP-XRD) and transmission electron microscopy (TEM) were used for structural analysis. In acidic to neutral pH, Mg-bearing brushite phases formed over a wide range of Ca:Mg ratios. In neutral to high pH systems, a short-range order amorphous calcium phosphate (ACP) with a local structure analogous with hydroxyapatite precipitated for a wide range of Ca to Mg ratios. It can be inferred that the presence of Mg in soils leads to stabilization of metastable phases: via cation substitution in brushite and via poisoning of crystal growth propagation for hydroxyapatite.

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“…In soil systems, dissolved PO 4 is inhibited through strong partitioning of PO 4 3– via sorption processes such as adsorption on mineral surfaces and precipitation of phosphate‐bearing minerals. In calcareous soils, characterized by neutral pH and high CaCO 3 content, this typically leads to formation of sparingly soluble Ca phosphate minerals that decrease bioavailability and greatly reduce P transport (Tunesi et al, 1999; Cao and Harris, 2008; Manimel Wadu et al, 2013; Siciliano et al, 2016; Bulmer et al, 2018; Hamilton et al, 2018). The extent that Ca‐P minerals limit solubility depends strongly on the crystal structure of the mineral phase, which largely depends on solution pH (Peak et al, 2012).…”

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confidence: 99%

“…A pretreatment experiment was devised to either remove soil Ca and increase Mg concentrations, or increase Ca levels beyond their current levels and saturate exchange sites. This produced three treatments: untreated (control), Ca‐saturated, and Ca‐depleted (von Wandruszka, 2006; Manimel Wadu et al, 2013; Bulmer et al, 2018). The results helped to (i) illustrate the roles of excess Ca and Mg in the speciation of phosphate and (ii) demonstrate the influence of citrate on P adsorption.…”

mentioning

confidence: 99%

Effects of Citrate on the Rates and Mechanisms of Phosphate Adsorption and Desorption on a Calcareous Soil

Bulmer

Hamilton

Kar

et al. 2019

Soil Science Soc of Amer J

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Citrate and Ca influence the P sorption in calcareous soil. Labile Ca influences the citrate‐enhanced P desorption. The soil P reactions obey the pseudo‐second‐order kinetics. P sorption in calcareous soil is Ca‐concentration dependent. Adsorption at the soil–water interface is a fundamental chemical process that often controls the retention of compounds in soils. The rates of adsorption therefore have a vital role in the fate and transport of phosphate in the soil environment. In this study, the effects of a range of organic acid (citrate) levels and soil Ca levels on phosphate (PO43−) adsorption and desorption were investigated in detail through a combination of laboratory (miscible displacement kinetics) and synchrotron‐based X‐ray absorption spectroscopy. A pseudo‐second‐order kinetics model was applied to the data that provided good fits for the entire datasets (both adsorption and desorption) with a single set of equations. In general, it was observed that citrate directly competed for adsorption sites in soils with reduced levels of Ca but in soils high in labile Ca, citrate was not competitive in desorbing P. The most likely explanation for this is that citrate instead chelates with Ca to form soluble complexes when an excess of Ca is present.

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Exchangeable Calcium/Magnesium Ratio Affects Phosphorus Behavior in Calcareous Soils

Cited by 29 publications

References 46 publications

Short-term low-severity spring grassland fire impacts on soil extractable elements and soil ratios in Lithuania

Short-term low-severity spring grassland fire impacts on soil extractable elements and soil ratios in Lithuania

The Influences of Magnesium upon Calcium Phosphate Mineral Formation and Structure as Monitored by X-ray and Vibrational Spectroscopy

Effects of Citrate on the Rates and Mechanisms of Phosphate Adsorption and Desorption on a Calcareous Soil

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