The effects of environment on the relationship between cotton fibre properties and yarn characteristics

Abstract

Cotton fibre samples from three different localities were commercially processed into 15 and 30 tex ring spun yarns and 20, 30 and 50 rotor spun yarns. Multiple regression analyses were used to relate yarn tenacity and irregularity to the different fibre characteristics for all five yarn types. Multi-collinearity amongst fibre properties suggested that micronaire and fibre fineness and maturity should not be used simultaneously in a multiple regression analysis. The high correlation between 2,5% span length and 50% span length also required that only one of these two measured fibre properties be used as an independent variable. With backward stepwise regression analysis highest R2 values were realized for the samples from Loskop. A larger percentage of the variation in yarn tenacity and irregularity was explained by the independent X-variables in the case of Loskop samples than was the case with samples from Rustenburg or Vaalhartz. Fibre maturity and fibre fineness gave better results as independent variables than micronaire units. Breeders should be able to obtain maturity and fineness evaluations on a routine basis.Katoenvesel monsters afkomstig vanaf drie verskillende lokaliteite is kommersieel gespin in 15 en 30 tex ring spin garings en 20, 30 en 50 tex rotor spin garings. Meervoudige regressie is gebruik om die verwantskap tussen veseleienskappe en garing taaiheid en garing egaalheid vir die vyf garing tipes te bepaaL Multikollineariteit tussen veseleienskappe het aangedui dat mikronaire waardes en veselrypheid en fynheid verkieslik nie gelyktydig in 'n meervoudige regressie analise as onafhanklike veranderlikes gebruik moet word nie. Die hoe korrelasie tussen 2,5% spanlengte en 50% spanlengte het ook vereis dat slegs een van die twee vesel karaktereienskappe as 'n onafhanklike veranderlike gebruik word. Terugwaartse stapsgewyse regressie het aangetoon dat van die drie lokaliteite betrokke die hoogste R2-waardes verkry is met monsters vanaf Loskop. 'n Groter persentasie van die variasie in garing taaiheid en egaalheid is deur die onafhanklike veranderlikes verduidelik in die geval van Loskop monsters as wat die geval met Rustenburg of Vaalhartz monsters was. Veselrypheid en veselfynheid bepalings in plaas van blote mikronaire bepalings het as onafhanklike veranderlikes by hierdie studie beter resultate gegee. Telers behoort in staat te wees om informasie oor rypheid en fynheid van vesels op roetine basis te kan bekom.