Proficiency testing and other interactive measures to enhance analytical quality in soil and plant laboratories

Rayment, G. E.; Miller, Robert O.; Sulaeman, Eman

doi:10.1080/00103620009370523

Cited by 21 publications

(12 citation statements)

References 21 publications

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“…The annual frequency of ASPAC's proficiency programs has been questioned previously (9) and warrants further benefit-cost review. For example, a program of two samples conducted three times annually or three samples twice annually would place additional demands on ASPAC as the service provider.…”

Section: Performance Enhancementmentioning

confidence: 98%

“…Soil programs from 1995 and plant programs since 1996 were processed by using nonparametric statistical procedures (8,9), noting that only outrageously deviant results (e.g., incorrect units) were removed from data sets used to derive sample population statistics on a round-by-round basis. Accordingly, the results from these were amenable to collation on a method-bymethod basis to obtain a reasonable estimate of robust coefficients of variation (CV) for known concentrations.…”

Section: Datamentioning

confidence: 99%

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Statistical Aspects of Soil and Plant Test Measurement and Calibration in Australasia

Rayment¹

2005

Communications in Soil Science and Plant Analysis

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This article outlines the contemporary analytical performance of soil and plant analyses in Australasia. These derive from interlaboratory proficiency programs conducted by the Australasian Soil and Plant Analysis Council (ASPAC) in 2001/2002 and earlier. Contemporaneously, the best-performed soil tests were pH (mean robust CVs around 2.2%), whereas soil methods with robust median CVs in excess of 20% included exchangeable Na, Bray-P, water-soluble Cl, hot CaCl 2 -extractable B and KCl-exchangeable Al. The plant tests with the lowest CVs were total C, N, and P; the worst were total Na, Al, Co, Mo, Cd, Pb, Si, and Se. For both soil and plant tests, improvements in analytical performance are less than expected, which may be due in part to some of ASPAC's interlaboratory proficiency program policies. There is brief comment on strategies that may improve analytical performance, including discussion of social perspectives that include the use of "rewards." Analytical performance, however, is only one factor influencing outcomes from testing. Others relate to the derivation of critical values or ranges, and relationships between fertilizer rates and yields. This article draws attention to the influence statistics has on these. Relevant attributes of nonlinear models and other alternatives are discussed, with preference given to choices favoring low nutrient inputs to lessen the likelihood of off-farm movement of nutrients to water. The consistently poor analytical performance of Bray-P calls into question its diagnostic value, whereas there is a need

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Section: Performance Enhancementmentioning

confidence: 98%

Section: Datamentioning

confidence: 99%

Statistical Aspects of Soil and Plant Test Measurement and Calibration in Australasia

Rayment¹

2005

Communications in Soil Science and Plant Analysis

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“…A key issue of communication of results to clients was presented by Vaughan (2000) as well as proficiency testing to safeguard analytical quality (Rayment, Miller, and Sulaeman 2000). Other pivotal and growing concerns related to the environment were highlighted: efficient use of nutrients (Johnston 2000), pesticides in farming systems (Kookana and Simpson 2000), heavy metals (McLaughlin et al 2000), safeguarding soil and water quality (Sparrow, Sharpley, and Reuter 2000), and beneficial use of effluents, wastes, and biosolids (Sumner 2000).…”

Section: Locationmentioning

confidence: 99%

Soil and Plant Analysis Council: A Model for Scientific Innovation, Education, and Development

Kalra

Ryan

2009

Communications in Soil Science and Plant Analysis

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“…Participating laboratories accept an invitation to participate in each program and pay a costrecovery price for six soil or plant samples as applicable. [15,16] In addition to the ASPAC programs, three Australian laboratories participated in the 14 th Round of the NRC/CNRC -NOAA trace metals intercomparisons program for marine sediments and biological tissues (G. Barry, personal communication). Laboratories are given a confidential reference number and about two months to complete their analyses and return results, including details of the methods [14] and units employed.…”

Section: Aspac and Other Proficiency Programsmentioning

confidence: 99%

Proficiency Testing for Soil and Plant Analysis in Australasia

Rayment¹,

Peverill

2002

Communications in Soil Science and Plant Analysis

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The Australasian Soil and Plant Analysis Council Inc (ASPAC) has coordinated regular inter-laboratory proficiency programs separately for soil and plant samples since the early 1990's. Certification of proficiency to perform specific tests depended on the demerit points accrued for the test in the particular program, without heed to historical performance. In addition to describing local ad hoc initiatives to enhance soil and plant analytical quality, this paper provides feedback on longer-term laboratory performance, based on reported results for eight tests in the four most recent ASPAC plant inter-laboratory proficiency programs (20 laboratories) and the three most recent ASPAC programs for soils (12 laboratories). Laboratories were subsequently rated as Category 1 through to Category 4 (best to least-well performed).

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Proficiency testing and other interactive measures to enhance analytical quality in soil and plant laboratories

Cited by 21 publications

References 21 publications

Statistical Aspects of Soil and Plant Test Measurement and Calibration in Australasia

Statistical Aspects of Soil and Plant Test Measurement and Calibration in Australasia

Soil and Plant Analysis Council: A Model for Scientific Innovation, Education, and Development

Proficiency Testing for Soil and Plant Analysis in Australasia

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