2013
DOI: 10.2136/sssaj2012.0102
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Exchangeable Calcium/Magnesium Ratio Affects Phosphorus Behavior in Calcareous Soils

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Cited by 30 publications
(22 citation statements)
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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%
“…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%
“…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%
“…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).…”
mentioning
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%