2026-09-21T05:39:06Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/116290 2023-07-11 col_2142_5131 col_2142_14798 com_2142_5130 com_2142_686 com_2142_397

Margenot, Andrew J Villamil, Maria B Cusick, Roland D 2022-08 application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms The student, Patricia Leon, accepted the attached license on 2022-07-22 at 13:19. The student, Patricia Leon, submitted this Thesis for approval on 2022-07-22 at 13:27. This Thesis was approved for publication on 2022-07-25 at 09:06. DSpace SAF Submission Ingestion Package generated from Vireo submission #18425 on 2022-11-15 at 18:22:08 Evaluation of struvite leaching potential relative to monoammonium phosphate through field and soil column trials Leon, Patricia 2022-07-25 struvite monoammonium phosphate nutrient leaching soybean yield yield-scaled losses soil column 33P Struvite (MgNH4PO4·6H2O) is a wastewater-derived phosphorus (P) fertilizer that is hypothesized to reduce phosphorus (P) and nitrogen (N) losses compared to conventional P fertilizer, such as monoammonium phosphate (MAP). Few studies have examined the fate of struvite compared to MAP at both the field scale and through soil column trials. The objectives of the research conducted for this thesis were to 1) test hypothesized differences in leaching of P and N and test how differences in struvite and MAP solubility influence yield-scaled losses and 2) to assess the P and N leaching of struvite relative to MAP in soil columns. A randomized-complete block design was conducted, with smectitic, mesic Aquic Argiudolls (Urbana, IL) and mixed, active, mesic Oxyaquic Fragiudalfs (Ewing, IL) fields. Additionally, a series of soil column experiments where struvite was compared to MAP through indirect (labeled) and direct (labeled) methods of determination of P and N leaching in two soil types with contrasting organic matter (OM) content. Yield-scaled P and N losses from struvite were significantly lower than MAP at both sites by 10 and 53%, respectively. Struvite at the field scale appears to reduce P and N leaching and yield-scaled loss risks compared to MAP, pointing towards the potential of struvite to reduce nutrient losses during the offseason. In soil columns, less than 0.13% of granular struvite-P and 3% of struvite-N was leached compared to 14% of granular MAP-P and 83% of MAP-N by 3.67 pore volumes (vp). Struvite across the field scale and soil column scale was found to reduce the risk of P and N losses while having similar yield to MAP, supporting future applications of struvite as a P fertilizer. Thesis eng https://hdl.handle.net/2142/116290 Copyright 2022 Patricia Leon M.S. Thesis Crop Sciences University of Illinois at Urbana-Champaign Crop Sciences