Brix Correlations between Individual Internodes and Whole Stem of Sugarcane in Maturity

The sugar content(brix) correlations between individual internodes and whole stem of sugarcane Yuetang93-159 in maturity were studied through the correlation,partial correlation analysis and path analysis.The result showed as follows: The sugar content(brix degree) in individual internodes from the bottom to the top of the stem was changing trend as low-high-low,brix of the upper part the stem was relatively high.The brix from the 22th to 26th internodes of the stem were the highest,while that from the first to 5th internodes was the lowest.The mean brix of all internodes and the mean brix of the whole stem were very similar to that of the 7th,8th,9th,10th,11th,and 12th internodes.That is,the brix value of the whole stem of sugarcane could be represented with that of from 7th to 12th each internode.The brix degrees of the individual internodes of from the 5th to 8th(X5-8) internodes had high directly positive effects on that of the whole stem.The brix degree of the from the first to 4th(X1-4) internodes had high directly negative effects on that of the whole stem.