Reaction Products of Orthophosphates in Soils Containing Varying Amounts of Calcium and Magnesium

Racz, G. J.; Soper, R. J.

doi:10.4141/cjss67-035

Cited by 39 publications

(27 citation statements)

References 3 publications

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“…A variety of P minerals may coexist at the pH of 7.2 found on the Waskada soils. Mg-phosphates may have formed in this soil as the water soluble Ca:Mg ratio of the Waskada soil was 1.6 which approaches the ratio of 1.5 at which Racz and Soper (1967) reported Mg-phosphate formation. The solubility of Mgphosphates indicate they can be discounted as permanent fixation products and should constitute forms capable of supplying readily available P to plants (Lindsay 1979 (Fixen et al 1983;Fixen and Ludwick 1982;.…”

Section: Data Treatmentmentioning

confidence: 99%

“…Soils receiving successive yearly applications of P fertilizer (Barber 1980; Cope l98l; Olsen et al 1983;Spratt and McCurdy 1966) or single large broadcast P applications may, therefore, experience aJt accumulation of residual P (Read et al 1977;Sharpe et al 1984). In calcareous soils, these residual portions may contribute significant quantities of P to crop production as they can form labile inorganic P compounds such as octocalcium phosphate (OCP) and dicalcium phosphate dihydrate (DCPD) (Bell and Black 1970;Racz and Soper 1967;Sadler and Stewartl9T 5,1977) and mineralizable organic P forms (Chauhan et al 1981;Halm etal.1972). …”

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confidence: 99%

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Changes With Time in the Form and Availability of Residual Fertilizer Phosphorus on Chernozemic Soils

Wagar¹,

Stewart²,

Moir³

1986

Can. J. Soil. Sci.

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A sequential phosphorus (P) fractionation procedure was used to measure the changes in the labile and stable forms of inorganic and organic P following single broadcast P applications to Canadian Chernozemic soils under cereal cropping. Apg1o-limately half of the fertilizer residues remained in plant-available foims (resin, NaHCor). In a Black waskada clay loam 8 yr after the application of 200 and 400 kg P ha-', residual fertilizer p consisted of resin-p, 3\ab%; HCI_P, 25_3OVo;res_ idue-P, lU-l1Vo; NaOH-P, l}-l1Vo, NaHCOT-p, l\Vo; and aggregate protected p, 3Vo.The residues in a Dark Brown Sutherland clay 5 yr after the application of 160 kg P ha-t were: resin-P, 35Zo; NaOH-p , 3040Vo; Nai{COr-p, rcn;gCl_p , USE\; Hrso4-P, 5vo; and aggregate protected p, 5vo. The soils differed in the quantity of fertilizer recovered in inorganic HCl-extractable forms. In the Sutherland soil-the change from wheat-fallow to continuous wheat cropping produced a build-up of organic P which occurred with and without the addition of p fertilizer. Stewart 1975Williams et al. 1967). Experiments to evaluate fertilizer P residues using plant uptake or extractable P in soils measure only the labile, plantavailable soil P pool and do not document the fate of all the applied P. A more complete assessment of residual P in soils would include all soil P pools, as transformations among these pools may alter the long-term availability of fertilizer P residues.The purpose of the present work was to build upon previous studies which documented the effect that large applications of fertilizer P had on grain yield and labile inorganic P pools in Chernozemic soils (Bailey etal. 1977;Read et al. 1973 Read et al. ,1977Spratt et al. 1980 (Bailey et al. 1977;Read et al. 1973 Read et al. , 1977 0' 20' 40' 80 and I 60 kg P ha-' to a Sutherland soil. The field plan, yields and nutrient uptake of this study have been described previously (Wager et al' 1986). The location, classification and characteristics of the soils used in this study were obtained from Read et al. (1977) and Souster (1979 0-, 20-, 40-,80-and 160-kg P ha-' treatments was analyzed individually to allow for statistical interpretation. Phosphorus FractionationIn this procedure (Fig. l), labile inorganic P (P,) and organic P (P.) forms are removed first, followed by more stable P forms removed with stronger extracting agents (Hedley et al. 1982

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Section: Data Treatmentmentioning

confidence: 99%

mentioning

confidence: 99%

Changes With Time in the Form and Availability of Residual Fertilizer Phosphorus on Chernozemic Soils

Wagar¹,

Stewart²,

Moir³

1986

Can. J. Soil. Sci.

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“…In neutral and calcareous soils, dicalcium phosphate dihydrate, octacalcium phosphate and apatites are the phosphate compounds usually present (7,71,12, I7'). Soils having a water-soluble calcium to magnesium ratio of approximately 1.5 or less have been found to precipitate added phosphare as dimagnesium phosphate trihydrate and trimagnesium phosphates in addition to the calcium phosphates usually found in soils ( 13 For personal use only.…”

Section: Introductionmentioning

confidence: 99%

Solubility of Dimagnesium Phosphate Trihydrate and Trimagnesium Phosphate

Racz¹,

Soper²

1968

Can. J. Soil. Sci.

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“…CaHPOi). *2H20 is an important initial soil-fertilizer reaction pro duct in the vicinity of Ca(H2P04)2*H20 or NH4H2PO4 fertilizer (Lindsay et al, 1959;Lindsay and Taylor, 1960;Racz and Soper, 1967). Above pH 5, CaHPO^'ZH^O is theoretically unstable with respect to CaHPO^^, CagH2(P0ij,)5*5H20, and Caio(OH)2(P04)6 (Moreno et 1960b).…”

Section: Identification Of Reaction Productsmentioning

confidence: 99%

“…After being washed with acetone, the crystals were identi fied by their optical properties as CaHPOij,*2H20 and CaHPO/j., the former being the most prevalent phase. Racz and Soper (1967) used X-ray diffraction analysis to identify the crystalline phosphates produced in two calcareous soils treated with pellets of NHij,H2P0^ and (NHi^)2HP04. The compounds probed from the soil to which NHi^H2P0i,.…”

Section: Identification Of Reaction Productsmentioning

confidence: 99%

Nature and transformation of crystalline phosphates produced by interaction of phosphate fertilizers with slightly acid and alkaline soils

Bell

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Reaction Products of Orthophosphates in Soils Containing Varying Amounts of Calcium and Magnesium

Abstract: The reaction products formed rvhen orthophosphates (peliers) rvere added to 22

Cited by 39 publications

References 3 publications

Changes With Time in the Form and Availability of Residual Fertilizer Phosphorus on Chernozemic Soils

Changes With Time in the Form and Availability of Residual Fertilizer Phosphorus on Chernozemic Soils

Solubility of Dimagnesium Phosphate Trihydrate and Trimagnesium Phosphate

Nature and transformation of crystalline phosphates produced by interaction of phosphate fertilizers with slightly acid and alkaline soils

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