title: Phosphorous extractability and ryegrass availability from bio-waste composts in a calcareous soil.
abstract: In this work four stable bio-waste composts (C1, C2, C3, C4) were selected on the basis of their increasing water soluble P (H2O-P). The P speciation was assessed via sequential chemical extraction (SCE) on the same products. Moreover, the plant-available P was assessed via apparent recovery fraction approach (ARF) in a pot test on ryegrass over 21 weeks at 15 mg P kg-1of soil. An inorganic P source (P-chem) was added as a reference at the same P rate in addition to a non-fertilized control (Control). SCE showed that the sparingly soluble P (HCl-P) was the most important fraction in all composts: C1 (HCl 65% > NaHCO317% = NaOH 17% > H2O 1%); C2: (HCl 51% > NaOH 23% > NaHCO318% > H2O 7%); C3: (HCl 58% > NaOH 21% > NaHCO312% > H2O 9%); C4: (HCl 39% > NaOH 23% > NaHCO322% > H2O 16%). The plant test showed that the different treatments had a different ARF (%) at the first harvest: P-chem (14.7)> C4 (14.4)> C3 (14.1)> C2 (3.4)>C1 (3.1), compared to the cumulated ARF (%) of the six harvests: C4 (50.1)> C3 (35.0)> C1 (21.1)> C2 (18.3)> P-chem (17.4). Data showed a good correlation of H2O-P vs. plant ARF at the first harvest and a good correlation of labile P (H2O-P + NaHCO3-P) vs. total plant ARF over 21 weeks. The free and labile P forms from SCE can be a valuable tool in the assessment of fast and middle term plant-available P from stable bio-waste composts in calcareous soils.
authors.affiliation: Department of Agricultural Sciences, Alma Mater Studiorum - University of Bologna, Viale G. Fanin, 40, 40127, Bologna, Italy. Electronic address: marco.grigatti@gmail.com.
authors.forename: Marco
authors.initials: M
authors.lastname: Grigatti
authors.affiliation: Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - University of Bologna, Via F. Selmi, 40126, Bologna, Italy.
authors.forename: Elisa
authors.initials: E
authors.lastname: Boanini
authors.affiliation: Department of Agricultural Sciences, Alma Mater Studiorum - University of Bologna, Viale G. Fanin, 40, 40127, Bologna, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Mancarella
authors.affiliation: Department of Agricultural Sciences, Alma Mater Studiorum - University of Bologna, Viale G. Fanin, 40, 40127, Bologna, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Simoni
authors.affiliation: Consorzio Italiano Compostatori, Via Cavour, 183/A, 00184, Roma, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Centemero
authors.affiliation: Research & Business Development, Attero, P.O. Box 4114, 6080 AC, Haelen, The Netherlands.
authors.forename: Adrie H M
authors.initials: AHM
authors.lastname: Veeken
mesh_terms: D006863:Hydrogen-Ion Concentration; D008129:Lolium / Q000378:metabolism*; D017744:Medical Waste Disposal; D010758:Phosphorus / Q000737:chemistry* / Q000302:isolation & purification* / Q000378:metabolism; D012987:Soil / Q000737:chemistry*; D012995:Solubility; D014867:Water / Q000737:chemistry
chemical_list: D017744:Medical Waste Disposal; D012987:Soil; D014867:Water; D010758:Phosphorus
keywords: Inorganic phosphorous; Organic phosphorus; Sequential extraction; Water extractable P; X-ray diffraction