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7th Trial on standardization of instrument testing of cotton over

11
Oct '08
The seventh Round Trial conducted under the auspices of the Task Force on Commercial Standardization of Instrument Testing of Cotton (CSITC RT 2008-3) was conducted during August and September 2008. 60 testing facilities with 81 instruments participated. Participating testing centers were located in Africa, Asia, Australia, Europe, North America, and South America.

In each Round Trial, five cotton samples with known values are mailed to each participating laboratory. Each laboratory tests each sample six times each day for five days, for a total of 150 tests. Each sample is tested for the six CSITC parameters of length, length uniformity index, micronaire, strength, Rd (reflectance) and +b (yellowness). Accordingly, 900 separate test results (150 tests of 6 parameters) from each instrument are evaluated.

Laboratory results for each Round Trial are collected by USDA and forwarded to the Bremen Fibre Institute for evaluation. Laboratories are given an overall ranking, as well as rankings for performance on each of the six parameters. Rankings are based on the first four upland cotton samples with known values. The purpose of the fifth cotton sample in all CSITC Round Trials is for special study purposes and is not used for performance-ranking.

Results for each test center are confidential, but each testing facility received an evaluation of its performance in the Round Trial and a detailed diagnostic analysis of results.

Rankings are based on the results of each lab in coming closest to the mean (average) values for all laboratories participating in the Round Trial on all six parameters.

The range of scores for the combined properties among the 81 instruments was 0.21 to 2.55 (a score of zero would be perfect), and the median overall evaluation of combined properties was 0.53. The results in CSITC RT 2008-3 are consistent with the results from previous Round Trials conducted in 2007 and 2008.

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International Cotton Advisory Committee


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