Calibration of HVI cotton elongation measurements
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(2020) 3:31
Journal of Cotton Research
RESEARCH
Open Access
Calibration of HVI cotton elongation measurements DELHOM Christopher D.1* , HEQUET Eric F.2, KELLY Brendan2, ABIDI Noureddine2 and MARTIN Vikki B.3
Abstract Background: The strength of cotton fiber has been extensively studied and significant improvements in fiber strength have been made, but fiber elongation has largely been ignored, despite it contributing to the energy needed to break fibers, which affects fiber handling and processing. High Volume Instruments (HVI) measure fiber elongation but have not been calibrated for this property, making the measurement unavailable for comparative work among instruments. In prior work, a set of elongation calibration materials had been developed based on Stelometer results. A round trial of ten Australian and U.S. instruments was conducted on six cotton samples representing a range of 4.9% to 8.1% elongation. Results: By scaling the HVI elongation values of each instrument to the values of the two calibration samples, the coefficient of variation in instrument measurements was reduced from an average of 34% for the uncalibrated measurements to 5% for the calibrated measurements. The reduction in variance allows for the direct comparison of results among instruments. A single-point elongation calibration was also assessed but found to be less effective than the proposed two-point calibration. Conclusion: The use of an effective calibration routine on HVI measurement of cotton significantly reduces the coefficient of variation of the elongation measurement within and between instruments. The implementation of the elongation calibration will allow testing and breeding programs to implement high-speed elongation testing which makes the use of elongation values possible in breeding programs. Keywords: Cotton, Elongation, High volume instrument, Tenacity, Work-to-rupture
Background Virtually every bale of U.S. produced upland cotton (Gossypium hirsutum L.) is classified by the Agricultural Marketing Service (AMS) of the United States Department of Agriculture (USDA). The Smith-Doxey Act, signed into law in 1937, authorizes AMS to classify cotton that is to be commercially traded. Human classers were used initially, but with the introduction of the High Volume Instrument (HVI) in 1980, the process started to be automated. Since 1991, the entire U.S. cotton crop has been classed using the HVI. Cotton classification by HVI assigns values for fiber length, strength, micronaire, color, and non-lint content, * Correspondence: [email protected] 1 USDA-ARS, New Orleans, LA 70124, USA Full list of author information is available at the end of the article
but not elongation. The goal of cotton classification is to allow cotton buyers to purchase cotton bales with fiber properties that will result in textile products with consistent and desired properties. As HVI technology gained acceptance, researchers also began to use HVI measurements in efforts to improve cotton fiber quality traits; however, the needs of research
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