|Meredith Jr, William|
Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: March 12, 2007
Publication Date: June 12, 2007
Citation: Davidonis, G.H., Meredith Jr, W.R. 2007. Evaluation of fiber maturity distributions. National Cotton Council Beltwide Cotton Conference. p. 2107-2107. Technical Abstract: Maturity, fineness and perimeter are important parameters in processing and end product quality. Micronaire is a composite of fineness and maturity. Maturity can be expressed in terms of Maturity Ratio (MR), degree of fiber circularity (theta) or cell wall thickness. The maturity distribution was expressed as the percent of fibers in specific theta ranges.The ranges used were the percent of fibers with theta values below 0.25 (IFC) and the percent of fibers with theta values at or above 0.70 (XFF). Twenty varieties from the 2005 National Cotton Variety Trials grown in TX, LA, MS and SC were analyzed (HVI, Arealometer, AFIS v4.22). Arealometer perimeter values showed a considerable degree of variability, consequently AFIS calculated perimeters were used. When fiber length was similar across environments some varieties showed an increase in MR that was accompanied by an increase in micronaire, increase in cell wall thickness, decrease in IFC, increase in XFF and an increase in perimeter. In some varieties an increase in perimeter did not occur. Within a variety where mean theta values were similar across environments, different maturity distributions were reflected in different XFF percentages. Varieties were compared within an environment. Small perimeter varieties(FM800 B/R, NMN1155) that had similar perimeter, MR, and micronaire in MS and SC had similar IFC and XFF percentages. FM960 B2R and DP445 had similar perimeters, MR , micronaire and IFC percentages in TX, LA and MS but different XFF percentages. FM960 B2R and JAJO1145 had the same perimeter, MR, micronaire and IFC percentages in TX, LA and MS but different XFF percentages. DP445 and JAJO1145 had similar XFF percentages. Therefore some varieties that have the same perimeter, MR and micronaire values have the same maturity distributions. Others that have the same perimeter, MR and micronaire have different maturity distributions.