Römer, Wilhelm

[["dc.bibliographiccitation.firstpage","173"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Nutrient Cycling in Agroecosystems"],["dc.bibliographiccitation.lastpage","184"],["dc.bibliographiccitation.volume","91"],["dc.contributor.author","Cabeza, Ricardo A."],["dc.contributor.author","Steingrobe, Bernd"],["dc.contributor.author","Roemer, Wilhelm"],["dc.contributor.author","Claassen, Norbert"],["dc.date.accessioned","2018-11-07T08:50:08Z"],["dc.date.available","2018-11-07T08:50:08Z"],["dc.date.issued","2011"],["dc.description.abstract","World phosphorus (P) resources are limited and may be exhausted within 70-175 years. Therefore recycling of P from waste materials by chemical or thermal processes is important. This study evaluated the effectiveness of recycled P products from sewage sludge and animal wastes as P fertilizer. Four products were obtained from chemical processes, three magnesium-ammonium-phosphates (MAP) of different sewage treatment plants and a Ca phosphate precipitated from waste-water (Ca-P) and four from thermal processes, an alkali sinter phosphate (Sinter-P), a heavy metal depleted sewage sludge ash (Sl-ash), a cupola furnace slag made from sewage sludge (Cupola slag) and a meat-and-bone meal ash (MB meal ash). The effectiveness of these products as P fertilizers compared with triple superphosphate (TSP) and phosphate rock (PR) was determined in a 2-year pot experiment with maize (Zea mays L., cv. Atletico) in two soils with contrasting pH (pH(CaCl(2)) 4.7 and 6.6). The parameters used to evaluate the effectiveness were P uptake, P concentration in soil solution (C(Li)) and isotopically exchangeable P (IEP). MAP products were as effective as TSP in both soils, while Ca-P was only effective in the acid soil. Sinter-P was as effective as TSP in the acid soil, while Cupola slag was in the neutral soil. The products Sl-ash and MB meal ash were of low effectiveness and were comparable to PR. The effect of the fertilizers on IEP, but not on C(Li), described their effectiveness. Recycled P products obtained by chemical processes, especially MAP, could be directly applied as P fertilizers, while products such as Sl-ash and MB meal ash are potential raw materials for P fertilizer production."],["dc.identifier.doi","10.1007/s10705-011-9454-0"],["dc.identifier.isi","000297360500006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21627"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1385-1314"],["dc.title","Effectiveness of recycled P products as P fertilizers, as evaluated in pot experiments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","688"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Journal of Plant Nutrition and Soil Science"],["dc.bibliographiccitation.lastpage","695"],["dc.bibliographiccitation.volume","176"],["dc.contributor.author","Cabeza, Ricardo A."],["dc.contributor.author","Steingrobe, Bernd"],["dc.contributor.author","Roemer, Wilhelm"],["dc.contributor.author","Claassen, Norbert"],["dc.date.accessioned","2018-11-07T09:18:55Z"],["dc.date.available","2018-11-07T09:18:55Z"],["dc.date.issued","2013"],["dc.description.abstract","Isotopically exchangeable P (IEP) is usually considered to be completely plant-available and the major source of P for plant uptake. The aim of the present study is to test whether plants can, besides IEP, also use non-IEP and if part of the IEP has an equilibrium concentration in soil solution which is below the minimum concentration, C-Lmin, and can therefore not be taken up by plants. A pot experiment was carried out with maize for two years on two soils, an acid sandy and a neutral loamy soil, either without P fertilizer or fertilized with ten P sources of different solubility. Throughout both years of the study, pots were kept moist either without plants or planted twice with maize (Zea mays L., cv. Athletico). At the end of the experiment, plant P uptake, P concentration in the soil solution (C-L), and P accessible to isotopic exchange within 5 d (E-5d) were measured. Plant growth decreased the E-5d which was about equal to P uptake by maize for most treatments in the acid soil. But for some treatments, i.e., five in the acid and eight in the neutral soil, P uptake was up to 50% larger than the decrease of E-5d, indicating that plants had, besides IEP, also used P from non-IEP sources. At adequate P supply, both soils had an E-5d of about 100 mg P (kg soil)(-1), but about 30 to 40 mgkg(-1) of this IEP had an equilibrium P concentration in the soil solution below C-Lmin of 0.1 mol L-1 at which P would actually not be plant-available. This study shows that plants take up P mainly from IEP, but not the whole IEP is plant-available. Furthermore, plants may also use P from non-IEP sources."],["dc.identifier.doi","10.1002/jpln.201200296"],["dc.identifier.isi","000327899800006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28512"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1522-2624"],["dc.relation.issn","1436-8730"],["dc.title","Plant availability of isotopically exchangeable and isotopically nonexchangeable phosphate in soils"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]