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Pakistan Journal of Biological Sciences
Year: 2003  |  Volume: 6  |  Issue: 2  |  Page No.: 99 - 104

Statistical Analysis of Certain Traits that Influence Sugar Recovery of Selected Sugarcane Varieties

N.E. Nosheen and M. Ashraf    

Abstract: Six exotic sugarcane varieties CP84-1198, CP85-1491, CP88-1165, CP89-846, TCP86-3368 and CP77-400 were included in the study. The study was conducted in order to determine the relationship between various agronomic traits as number of tillers, stalk height, stalk thickness, cane yield and brix value with sugar recovery. Genotypic and phenotypic correlation coefficient studies of each morphological character with sugar recovery showed negative and non-significant correlations with number of tillers, stalk height and cane yield. Positive but non-significant genotypic and phenotypic correlations were observed between sugar recovery and stalk girth. Only brix value showed positive and significant genotypic correlation with sugar recovery, while phenotypically this correlation was positive but non-significant. The results of the stepwise regression analysis indicated that on single factor basis the maximum R-square value of 0.594 was for brix value related to sugar recovery. The two variable model including the cane yield and brix value yielded highest R-square value of 0.699 with sugar recovery. When a three variable model was performed, out of all the combinations, the best one was for the stalk girth, cane yield and brix value with R-square 0.708. While in the four variable models, in the stepwise regression yielded the best one combination closely related to sugar recovery was stalk girth, stalk height and cane yield with R-square value 0.713. The R-square value was almost similar to four variable model i.e. 0.713 when five variable models were examined. The results of stepwise regression and correlation coefficients studies indicated that brix value (TSS %) and sugar recovery were closely related.

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