The effect of the level of phosphate rock application on its dissolution in soil and on bicarbonate-soluble phosphorus

Kanabo, I. A. K.; Gilkes, R. J.

doi:10.1007/bf01053316

Cited by 22 publications

(9 citation statements)

References 28 publications

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“…Percent dissolution of PR decreased with increasing application rate. These results are consistent with the findings of Kanabo and Gilkes (1988). The North Carolina PR showed a similar pat-tern of high reactivity in both soil horizons (Fig.…”

Section: Phosphate Rock Dissolutionsupporting

confidence: 91%

“…Calcium in the extracts was determined using ICP emission spectroscopy. The extent of dissolution was calculated from the P/Ca ratio in the PR assuming free calcite was not present and congruent dissolution of PR occurred (Kanabo and Gilkes, 1988).…”

Section: Methodsmentioning

confidence: 99%

“…Numerous studies have been conducted to investigate the reactivity and fertilizer effectiveness of phosphate rock (PR) sources in various types of soils (Chien et al, 1987;Hammond et al, 1986;Kanabo and Gilkes, 1988;Smyth and Sanchez, 1982). Recent studies on low buffer capacity acid soils have indicated that certain PRs have both a substantial liming effect and serve as an important source of Ca (Easterwood et al, 1989;Hellums et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

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The effect of phosphate rock dissolution on soil chemical properties and wheat seedling root elongation

et al. 1991

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Soils of the Appalachian region of the United States are acidic and deficient in P. North Carolina phosphate rock (PR), a highly substituted fluoroapatite, should be quite reactive in these soils, allowing it to serve both as a source of P and a potential ameliorant of soil acidity. An experiment was conducted to evaluate the influence of PR dissolution on soil chemical properties and wheat (Triticum aestivum cv. Hart) seedling root elongation. Ten treatments including nine rates of PR (0, 12.5, 25, 50, 100, 200, 400, 800, and 1600 mg P kg -~) and a CaCO 3 (1000 mg kg -1) control were mixed with two acidic soils, moistened to a level corresponding to 33 kPa moisture tension and incubated for 30 days. Pregerminated wheat seedlings were grown for three days in the PR treated soils and the CaCO 3 control. Root length was significantly (P <0.05) increased both by PR treatments and CaCO3, indicating that PR dissolution was ameliorating soil acidity. The PR treatments increased soil pH, exchangeable Ca, and soil solution Ca while lowering exchangeable A1 and 0.01 M CaC12 extractable soil A1. Root growth in PR treatments was best described by an exponential equation ( P < 0.01) containing 0.01 M CaC12 extractable A1. The PR dissolution did not reduce total soil solution AI, but did release A1 complexing anions into soil solution, which along with increased pH, shifted A1 speciation from toxic to nontoxic forms. These results suggest that North Carolina PR should contribute to amelioration of soil acidity in acidic, low CEC soils of the Appalachian region.

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Section: Phosphate Rock Dissolutionsupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of phosphate rock dissolution on soil chemical properties and wheat seedling root elongation

et al. 1991

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“…This phenomenon has been noted by other researchers (Engelstad, Jugsujinda & Datta, 1974;Khasawneh & Sample, 1978;Bolland & Bowden, 1984;Bolland, Weatherley, Gilkes & Bowden, 1986;Yeates & Allen, 1987). A further complication to the estimation of the relative agronomic effectiveness of PR is that the response curves for superphosphate and PR may differ in their functional form owing to differences in their dissolution behaviour in soils (Kanabo & Gilkes, 1988a). Thus, the effectiveness of PR does not remain constant, but varies according to the point on the response curve at which the comparison is made (Bolland & Barrow, 1988;Bolland & Gilkes, 1989).…”

Section: Results and Discussion Dry Matter Yieldsmentioning

confidence: 76%

The effectiveness of Langebaan rock phosphate and superphosphate in two acid, phosphate-deficient soils

Thibaud¹,

Farina²,

Hughes³

et al. 1992

South African Journal of Plant and Soil

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Acid, P-deficient soils with a large capacity to immobilize P favour the rapid decomposition of apatite. Such soils are widespread in the east of South Africa and the possibility exists that Langebaan rock phosphate (Langfos) may be a more cost-effective source of P than superphosphate on these soils. This study compared the effectiveness of granular Langfos to that of double superphosphate in a pot experiment using a strongly P-fixing Salmoral clay (Typic Haplorthox) and a weakly P-fixing Avalon sandy loam (Plinthic Paleudult). Five rates of double superphosp,hate (0,100,250,500 and 1 000 mg Pkg-1 ) and six of Langfos (0,100, 250, SOD, 1 000 and 2000 mg P kg-) were compared at three lime rates. Three consecutive crops of maize (lea mays L.) were grown for periods of four weeks. The average of the initial response slopes from the relationship between cumulative yield and P applied for the different lime applications showed that the effectiveness of Langfos relative to superphosphate was 10% and 18% for the Salmoral and Avalon soils, respectively. Lime had relatively little effect on plant response to superphosphate on the Salmoral, but had a marked positive effect on the Avalon. The response to Langfos was negatively affected by lime on the Salmoral, but only slightly so on the Avalon. These results suggest that granular Langfos will be more effective in acid sandy soils than in acid clay soils but that it is not an effective substitute in either for water-soluble P fertilizers.Suur, P-gebrekkige gronde met 'n hoe P-vasleggingsvermoe bevorder die vinnige ontbinding van appetiet. Sulke gronde kom wydverspreid in die ooste van Suid-Afrika voor, en die moontlikheid bestaan dat Langebaanrotsfosfaat (Langfos) op hierdie gronde dalk 'n meer koste-effektiewe bron van P as superfosfaat mag wees. Hierdie studie het die effektiwiteit van gekorrelde Langfos met dubbelsuperfosfaat vergelyk in 'n potproef op 'n hoe P-vasleggende Salmoral-klei (Typic Haplorthox) en 'n lae P-vasleggende Avalon sanderige leem (Plinthic paleudult). Vyf peile van dubbelsuperfosfaat (0, 100, 250, 500 en 1 000 mg P kg-1) en ses peile van Langfos (0, 1 ~O, 250, SOD, 1 000 en 2000 mg P kg-1) is vergelyk by drie verskillende kalk peile. Drie agtereenvolgende oeste van mielies (lea mays L.) is verbou vir periodes van vier weke elk. Die gemiddelde van die aanvangsgedeelte van die reaksie-kurwe van die verwantskap tussen kumulatiewe opbrengs en P toegedien vir die verskillende peile van kalk toon dat die effektiwiteit van Langfos relatief tot superfosfaat, respektiewelik 10% en 18% vir die Salmoral en die Avalon gronde was. Kalk het plantreak~ie op superfosfaat op die Salmoral grond relatief min geaffekteer, maar 'n merkbare positiewe effek op die Avalon grond gehad. Die reaksie op Langfos was deur kalk negatief op die Salmoral grond geaffekteer, maar slegs gering negatief opdie Avalon grond geaffekteer. Hierdie resultate dui aan dat gekorrelde Langfos nie 'n effektiewe plaasvervanger vir wateroplosbare bemestingsstowwe is nie en dat gekorrelde Langfos se...

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“…Factors affecting PR dissolution in soil include particle size, PR rate and chemical reactivity, pH, titrable acidity, and P buffering capacity, among others (Bolland and Gilkes, 1990;Chien and Menon, 1995;Mackay and Syers, 1986). Kanabo and Gilkes (1988) studied the dissolution of North Carolina RP in a lateritic soil and found that after 35 days of incubation, the percentage of the added PR dissolved ranged from 19% for particle size of less than 0.038 mm to 12% for particle size of 0.15 to 0.25 mm. The strong effect of particle size on PR dissolution was also found in the study of Watkinson (1994), who estimated the dissolution time to be 0.56 year for 0.075-mm particle size and 2.25 years for 0.15-mm particle size.…”

Section: Release Of CD From Tsp and Pr In Soilmentioning

confidence: 99%

Release of Cadmium From a Triple Superphosphate and a Phosphate Rock in Soil

Kuo¹,

Huang

Bembenek³

2007

Soil Science

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Although phosphorous fertilizers containing elevated amount of cadmium (Cd) could affect Cd accumulation in soils and crops, the extent of the effect may depend on the amount of Cd added and the rate of Cd release from those fertilizers. This study examined Cd forms of a triple superphosphate (TSP) and a western phosphate rock (PR) by sequential extractions and the rate of Cd release from the fertilizers by incubation in a silt loam and subsequent extraction with diethylenetriaminepentaacetic acid (DTPA). The lability of TSP Cd was high, as evidenced by its high solubility in water (36.0%) and 1 M HCl (57.8%). The lability of PR Cd, in contrast, was very low, with 0.1% soluble in water, 29.9% soluble in 1 M HCl, and 70.1% in the residual form. Although soil DTPA-Cd was substantially higher when the soil was treated with the TSP than with the PR at the same Cd rate, the difference narrowed as more PR Cd became extractable by DTPA with time, which reflected increased lability of PR Cd after incorporation into the soil. However, substantial amounts of the added TSP Cd (50%) and PR Cd (77.3%) remained not extractable by DTPA after 210 days of incubation. High correlation of DTPA-Cd with DTPA-zinc (Zn) in the TSP-or PR-treated soils suggested concurrent release of Zn with Cd from both P fertilizers. This should be beneficial, considering Zn can compete with Cd during bioaccumulation processes. (Soil Science 2007;172:257-265)

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The effect of the level of phosphate rock application on its dissolution in soil and on bicarbonate-soluble phosphorus

Cited by 22 publications

References 28 publications

The effect of phosphate rock dissolution on soil chemical properties and wheat seedling root elongation

The effect of phosphate rock dissolution on soil chemical properties and wheat seedling root elongation

The effectiveness of Langebaan rock phosphate and superphosphate in two acid, phosphate-deficient soils

Release of Cadmium From a Triple Superphosphate and a Phosphate Rock in Soil

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