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Phosphorus bioavailability of sewage sludge-based recycled fertilizers

Wollmann, Iris; Gauro, Ajay; Müller, Torsten and Möller, Kurt (2018) Phosphorus bioavailability of sewage sludge-based recycled fertilizers. Journal Plant Nutrition and Soil Science, 180, pp. 1-9. [In Press]

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Document available online at: https://onlinelibrary.wiley.com/doi/pdf/10.1002/jpln.201700111


Summary

Six phosphorus (P) fertilizers recycled from sewage sludge [Struvite SSL, Struvite AirPrex,P-RoC, Mephrec, Pyrolysis coal and Ash (Mg-SSA)] were tested for their plant availability in potted soil of pH 7.2 under greenhouse conditions. The crop sequence simulated a rotation of red clover (Trifolium pratense L.), maize (Zea maize L.), and ryegrass (Lolium perenne L.). Other P fertilizer treatments included: Phosphate Rock (PR), Calcium dihydrogen phosphate [Ca(H2PO4)2], and an unfertilized control. Additionally, soil was regularly inoculated with two strains of plant growth-promoting rhizobacteria (PGPR; Pseudomonas sp. Proradix, and Bacillus amyloliquefaciens) to test their ability to increase P availability to plants. Sequential P
fractionation was conducted to link the amount of readily available P in fertilizers to plant P acquisition. Shoot P content and dry matter of maize decreased in the following order: Struvite SSL >= Ca(H2PO4)2 > P-RoC >= Struvite AirPrex >= Mephrec > Pyrolysis coal >= Mg-SSA >= PR >= unfertilized. Rhizobacteria did not affect shoot biomass or P content. The results show that red clover might have mobilized substantial amounts of P. Sequential P fractionation was not suitable to predict the efficacy of the fertilizers. Generally, the sewage sludge-based fertilizers tested proved to be suitable alternative P sources relevant to organic farming systems. However, the efficacy of recycled fertilizers is strongly dependent on their specific production conditions.


EPrint Type:Journal paper
Keywords:phosphorus fertilization, phosphorus mobilization, red clover, rhizobacteria, struvite, CoreOrganic2, IMPROVE-P
Subjects: Crop husbandry > Composting and manuring
Soil > Nutrient turnover
Research affiliation: European Union > CORE Organic II > IMPROVE-P
Germany > University of Hohenheim > Institute of Crop Science
H2020 or FP7 Grant Agreement Number:249667
DOI:DOI: 10.1002/jpln.201700111
Related Links:http://coreorganic2.org/coreorganic2.asp
Deposited By: Möller, PD Dr. Kurt
ID Code:32921
Deposited On:15 Jun 2018 08:36
Last Modified:15 Jun 2018 08:37
Document Language:English
Status:In Press
Refereed:Peer-reviewed and accepted

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