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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Production Systems Research » Research » Publications at this Location » Publication #405634
Research Project: Development of Productive, Profitable, and Sustainable Crop Production Systems for the Mid-South

Location: Crop Production Systems Research

Title: Development and Evaluation of a Component Phosphorus Index for the State of Kansas

Author
item NELSON, NATHAN - Kansas State University
item KORTOKRAX, ABIGAIL - Kansas State University
item TOMLINSON, PETER - Kansas State University
item KLUITENBERG, GERARD - Kansas State University
item ROOZEBOOM, KRAIG - Kansas State University
item PRESLEY, DEANN - Kansas State University
item SWEENEY, DAN - Kansas State University Agricultural Research Center-Hays
item PIERZYNSKI, GARY - The Ohio State University
item SHESHUKOV, ALEKSEY - Kansas State University
item Bhandari, Ammar

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 9/10/2023
Publication Date: N/A
Citation: N/A

Interpretive Summary: No Interpretive Summary Required.MR

Technical Abstract: The Kansas P-index is a multiplicative style P-index used to assess the risk of P loss from agricultural fields based on potential P sources and transport pathways. Recent research has suggested that a component P-index may more accurately represent P loss processes and would therefore provide a better risk assessment for P loss. The objectives of this study were to i) develop a component index for potential use in the state of Kansas, ii) compare results from the current Kansas P-index and the component P-index to edge-of-field P loss data, and iii) evaluate the potential effects of the component index on P loss risk assessments for producer fields. The coefficients for the component P-index were developed through multiple linear regression with SAS proc mixed using a database of P loss estimates for 1360 cropping scenarios, which resulted in a very good relationship between estimated P loss and the component P-index result (r2=0.82). The indices were compared with 82 site-years of P loss data collected from edge-of-field runoff studies. The component index had a much stronger correlation with annual P loss data (r=0.85) than did the multiplicative index (r=0.30). Both indices had better correlations with average annual P loss data (n=22), where the correlation coefficients were 0.92 and 0.86 for the component and multiplicative indices respectively. The two indices resulted in the same P-index risk category for 16 of 38 producer fields. The risk categories increased for 13 fields, which were primarily fields with greater soil test P and lesser P application rates, and decreased for 9 fields, which were primarily fields with the combination of lesser soil test P and greater P application rates. The component index is a feasible alternative to the current multiplicative P-index in Kansas.