Statistical evaluation of phosphorus breakthrough profiles using a segmented exponential model

Autor:	D. V. Naylor, William J. Price, S. L. McGeehan, Bahman Shafii
Rok vydání:	1997
Předmět:	Phosphorus Soil Science Mineralogy chemistry.chemical_element Soil chemistry Soil science Geostatistics Exponential function chemistry Soil water Range (statistics) Soil column Environmental science Colorimetric analysis Agronomy and Crop Science
Zdroj:	Communications in Soil Science and Plant Analysis. 28:395-406
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103629709369798
Popis:	Few studies have utilized a statistical approach for the evaluation and comparison of breakthrough profiles obtained from soil column investigations. Our objective was to investigate the use of nonlinear estimation techniques to identify the phosphorus (P) breakthrough point and other parameters endemic to breakthrough data. Four soils exhibiting a range in physical and chemical properties were leached under saturated‐flow conditions with a 10 mg P/L solution for 34 d. Leachate P concentrations were analyzed by flow injection colorimetric analysis. A four‐parameter segmented exponential model provided a good fit for the breakthrough data in each soil tested. In addition to identifying the breakthrough point, the model parameters provided estimates of other identifiable aspects of a breakthrough profile including background P concentration, equilibrium P concentration, and the rate of concentration change once breakthrough is attained. Estimation of these parameters also facilitated statistical co...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3123853cfb1c416abd1b0bd02403e477 https://doi.org/10.1080/00103629709369798 Zobrazit plný text záznamu