{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/97288"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/97288","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effects of extraction time and phosphorus speciation on soil test phosphorus (STP) in Illinois agricultural soils","abstract":"The student, Anthony Miller, submitted this Thesis for approval on 2017-03-27 at 11:16.","abstract_html":"The student, Anthony Miller, submitted this Thesis for approval on 2017-03-27 at 11:16.","abstract_has_math":false,"creators":["Miller, Anthony Paul"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Natural Res & Env Sciences","degree_department":null,"school":null,"contributors":["Arai, Yuji"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-08-10T19:14:38Z","date_published":"2017-08-10T19:14:38Z","updated_at":"2026-07-22T22:24:32Z","subjects":["Soil test phosphorus (STP)","Bray P-1","Colorimetric phosphate analysis","Bray 1","Mehlich 3","Mehlich III","Molybdenum blue"],"languages":["en"],"rights":["Copyright 2017 Anthony Miller"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/97288","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Arai, Yuji"]},{"key":"dc:creator","label":"Author","values":["Miller, Anthony Paul"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-08-10T19:14:38Z","2017-03-28","2017-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Res & Env Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Soil test phosphorus (STP)","Bray P-1","Colorimetric phosphate analysis","Bray 1","Mehlich 3","Mehlich III","Molybdenum blue"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Anthony Miller"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/97288"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The student, Anthony Miller, submitted this Thesis for approval on 2017-03-27 at 11:16.","This Thesis was approved for publication on 2017-03-28 at 10:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10621 on 2017-08-10 at 13:38:23","Made available in DSpace on 2017-08-10T19:14:38Z (GMT). No. of bitstreams: 3 MILLER-THESIS-2017.pdf: 841753 bytes, checksum: 25db34b25a6474f9dfb03a27fc4a7c8e (MD5) Miller_Thesis Final_V6.docx: 3631313 bytes, checksum: 2f76ede569ebb4bfe003f9406b5849d2 (MD5) LICENSE.txt: 4211 bytes, checksum: c87d02f96f839def2cfb893128460201 (MD5) Previous issue date: 2017-03-28","Phosphorus (P) loss from agricultural soils is the leading cause of accelerated eutrophication of surface waters. As an essential plant nutrient, however, adequate soil P is required for plant growth. Soil test phosphorus (STP) methods have been developed to correlate P levels in soil to crop growth, so that producers may better estimate the supply of P. There are numerous limitations in STP procedures, however, including: inaccurate estimation of plant available P, (i.e., dissolved reactive P (DRP)), unknown speciation in STP extracts, and the unknown relationship between STP and temporal-scale P release. Assessing these limitations, the appropriate colorimetric methods to distinguish orthophosphate from organic phosphate (Po) in Bray P-1, and Mehlich III extracting solutions were first evaluated, including the effects of acid hydrolysis reactions on Po (phytic acid) and polyphosphate (tripolyphosphate and pyrophosphate) in the STP extracting solutions. Based on the assessment, the effects of extraction time and P speciation on the STP procedures were studied in P rich fertilizer-amended and manure-amended Central Illinois agricultural soils. Although the extent of P release is proportional to the total P extracted by STP methods, the results are highly influenced by longer extraction times and P species. A longer extraction time increases STP values, lowering fertilizer recommendations. Manure-amended soils released more inorganic P (Pi), Po, and colloidal P than did fertilizer-amended soils. The fraction of Po was substantial (10-50% of total P) in STP soil extracts. Overall, the results of this study suggest the complexity of interpreting current STP procedures for fertilizer recommendations.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Anthony Miller, accepted the attached license on 2017-03-27 at 11:11."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Effects of extraction time and phosphorus speciation on soil test phosphorus (STP) in Illinois agricultural soils"]}]}],"canonical_facts":{"dc:contributor":["Arai, Yuji"],"dc:creator":["Miller, Anthony Paul"],"dc:date":["2017-08-10T19:14:38Z","2017-03-28","2017-05"],"dc:description":["The student, Anthony Miller, submitted this Thesis for approval on 2017-03-27 at 11:16.","This Thesis was approved for publication on 2017-03-28 at 10:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10621 on 2017-08-10 at 13:38:23","Made available in DSpace on 2017-08-10T19:14:38Z (GMT). No. of bitstreams: 3 MILLER-THESIS-2017.pdf: 841753 bytes, checksum: 25db34b25a6474f9dfb03a27fc4a7c8e (MD5) Miller_Thesis Final_V6.docx: 3631313 bytes, checksum: 2f76ede569ebb4bfe003f9406b5849d2 (MD5) LICENSE.txt: 4211 bytes, checksum: c87d02f96f839def2cfb893128460201 (MD5) Previous issue date: 2017-03-28","Phosphorus (P) loss from agricultural soils is the leading cause of accelerated eutrophication of surface waters. As an essential plant nutrient, however, adequate soil P is required for plant growth. Soil test phosphorus (STP) methods have been developed to correlate P levels in soil to crop growth, so that producers may better estimate the supply of P. There are numerous limitations in STP procedures, however, including: inaccurate estimation of plant available P, (i.e., dissolved reactive P (DRP)), unknown speciation in STP extracts, and the unknown relationship between STP and temporal-scale P release. Assessing these limitations, the appropriate colorimetric methods to distinguish orthophosphate from organic phosphate (Po) in Bray P-1, and Mehlich III extracting solutions were first evaluated, including the effects of acid hydrolysis reactions on Po (phytic acid) and polyphosphate (tripolyphosphate and pyrophosphate) in the STP extracting solutions. Based on the assessment, the effects of extraction time and P speciation on the STP procedures were studied in P rich fertilizer-amended and manure-amended Central Illinois agricultural soils. Although the extent of P release is proportional to the total P extracted by STP methods, the results are highly influenced by longer extraction times and P species. A longer extraction time increases STP values, lowering fertilizer recommendations. Manure-amended soils released more inorganic P (Pi), Po, and colloidal P than did fertilizer-amended soils. The fraction of Po was substantial (10-50% of total P) in STP soil extracts. Overall, the results of this study suggest the complexity of interpreting current STP procedures for fertilizer recommendations.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Anthony Miller, accepted the attached license on 2017-03-27 at 11:11."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/97288"],"dc:language":["en"],"dc:rights":["Copyright 2017 Anthony Miller"],"dc:subject":["Soil test phosphorus (STP)","Bray P-1","Colorimetric phosphate analysis","Bray 1","Mehlich 3","Mehlich III","Molybdenum blue"],"dc:title":["Effects of extraction time and phosphorus speciation on soil test phosphorus (STP) in Illinois agricultural soils"],"dc:type":["text"],"thesis:degree_discipline":["Natural Res & Env Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:32Z"}