Phosphorus fractions and speciation in rural and urban calcareous soils in the semiarid region of Sulaimani city, Kurdistan, Iraq

Khorshid, Mohammad Said Hamma; Kruse, Jens; Semella, Sebastian; Vohland, Michael; Wagner, Jean-Frank; Thiele‐Bruhn, Sören

doi:10.1007/s12665-019-8543-2

Cited by 7 publications

(3 citation statements)

References 58 publications

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“…Phosphorus (P) losses from agricultural soils and subsequent transport of P to waterways can impair water quality of freshwater bodies through stimulating algal growth (Schindler et al, 2016(Schindler et al, , 2012. Chemical speciation of P is important for understanding its lability in soils and the potential risk of P mobilization from soils to waterways (Eriksson et al, 2015;Khorshid et al, 2019). Phosphorus in soils exists in various inorganic and organic forms (Pierzynski et al, 2015;Turrion et al, 2010), which differ in reactivity, mobility, and bioavailability.…”

Section: Introductionmentioning

confidence: 99%

Flooding‐induced inorganic phosphorus transformations in two soils, with and without gypsum amendment

et al. 2022

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Anaerobic conditions developed during flooding can increase phosphorus (P) losses from soils to waterways. Soil amendment with gypsum (CaSO4·2H2O) can effectively reduce flooding‐induced P release, but its effectiveness is soil dependent, and the reasons are poorly understood. The objectives of this study were to reveal the possible inorganic P transformations during flooding of two soils (acidic‐Neuenberg sandy loam [NBG‐SL] and alkaline‐Fyala clay [FYL‐Cl]), with and without gypsum amendment prior to flooding. Porewater samples collected at 0, 35, and 70 d after flooding (DAF) from soils incubated in vessels were analyzed for dissolved reactive P (DRP); pH; and concentrations of calcium (Ca), magnesium, iron (Fe), manganese, chloride, nitrate, sulfate, and fluoride. Thermodynamic modeling using Visual MINTEQ software and chemical fractionation of soil P were used to infer P transformations. Soil redox potential (Eh) decreased with flooding and favored reductive dissolution of Fe‐associated P increasing porewater DRP concentrations. Greater solubility of Ca‐P under acidic pH maintained a higher DRP concentration in NBG‐SL during early stages of flooding. A subsequent increase in pH with flooding and higher Ca concentration with added gypsum enhanced the stability of Ca‐P (β‐tricalcium phosphate and octacalcium phosphate), reducing the DRP concentration in gypsum‐amended NBG‐SL. Stability of Ca‐P was less affected with flooding and gypsum amendment in FYL‐Cl soil because it had an alkaline pH and inherently higher Ca concentration. The FYL‐Cl, with a more rapid decrease in Eh than NBG‐SL, became severely reduced, releasing more P and Fe by 70 DAF. These conditions favored vivianite formation in FYL‐Cl but not in NBG‐SL.

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Section: Introductionmentioning

confidence: 99%

Flooding‐induced inorganic phosphorus transformations in two soils, with and without gypsum amendment

et al. 2022

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“…The concentration of phosphors in table (5) shows the lowest concentration in comparison with nitrogen and potassium. This may be because that our Kurdistan soil contains a high amount of calcium carbonate, which causes P fixation in the soil and therefore leads to P deficiencies in plants [13].…”

Section: The Concentration Of Nitrogen (Npk) In Flag Leafmentioning

confidence: 99%

Comparison between Simbio, Organic and Chemical Fertilizers on the Yield and quantitate traits of Wheat Triticum aestivum L. on Nutrient Balance

Sulaiman,

Dizayee

2023

KUJAS

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The study involves a field experiment that will be conducted at the Ankawa field Directorate of Agricultural Research - Erbil in the growing season of 2021–2022, 10 km to the north of Erbil City (36.2463 N, 43.9931 E, and 420 m above mean sea level). To investigate the effect of three different types of fertilizers (simbio, organic, and chemical) with three different concentration levels (B0 B1 B2, O0 O1 O2, and C0 C1 C2) with three replications. The field experiment consists of 81 plots (27 * 3) using factorial split plot design. The wheat yield ranged from (3.02-5.56 Mg ha-1) the highest yield was in the plot (B2O2C2) and the lowest was in the plot (B0O0C0), moreover, the weight of 1000 gm ranged from (33.48-39.11), the highest and the lowest was the same as the yield plots. The concentration of NPK in the flag leaf of wheat ranged from (2.91-3.99 mg kg-1), (0.11-0.14 mg kg-1), and (1.62-1.82 mg kg-1) respectively.

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“…It is difficult for DSTF effluent treatment to achieve local wastewater emission standards, with the nutrient in effluent entering the regional water environment system, which can influence the surface water environment ( Qu et al, 2018 ; Shukla et al, 2020 ). In addition, the high proportion of soluble reactive phosphorus (SRP) in RDS causes low TP removal efficiency when traditional treatment processes (A/O or A 2 /O) are used ( Khorshid et al, 2019 ; Qin et al, 2019 ). Therefore, CWs are widely used in RDS treatment, so choosing fillers is very significant.…”

Section: Introductionmentioning

confidence: 99%

Removal efficacy of fly ash composite filler on tailwater nitrogen and phosphorus and its application in constructed wetlands

et al. 2023

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Constructed wetlands (CWs) have been widely used in tailwater treatment. However, it is difficult to achieve considerable removal efficiency of nitrogen and phosphorus in tailwater solely by CWs—an efficient green wetland filler is also important. This study investigated 160 domestic sewage treatment facilities (DSTFs) in rural areas from two urban areas in Jiaxing for TP and NH3-N and found that TP and NH3-N concentrations in rural domestic sewage (RDS) in this plain river network are still high. Therefore, we selected a new synthetic filler (FA-SFe) to enhance nitrogen and phosphorus reduction, and we discuss the importance of filler in constructed wetlands. Experiments revealed the adsorption capacity of the new filler: the maximum adsorption amounts of TP and NH3-N reached 0.47 g m-2 d-1 and 0.91 g m-2 d-1, respectively. The application potential of FA-SFe was verified in actual wastewater treatment, with the removal rates of ammonia nitrogen and TP reaching 71.3% and 62.7%, respectively. This study provides a promising pathway for nitrogen and phosphorus removal from rural tailwaters.

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Phosphorus fractions and speciation in rural and urban calcareous soils in the semiarid region of Sulaimani city, Kurdistan, Iraq

Cited by 7 publications

References 58 publications

Flooding‐induced inorganic phosphorus transformations in two soils, with and without gypsum amendment

Flooding‐induced inorganic phosphorus transformations in two soils, with and without gypsum amendment

Comparison between Simbio, Organic and Chemical Fertilizers on the Yield and quantitate traits of Wheat Triticum aestivum L. on Nutrient Balance

Removal efficacy of fly ash composite filler on tailwater nitrogen and phosphorus and its application in constructed wetlands

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