Birx and the Correlations Between Individual Internodes and the Whole Stem of Sweet Sorghum

The birxes and correlations between individual internodes and the whole stem of sweet sorghum Liaosiza3 were studied through the correlation and partial correlation analysis and path analysis. The results showed as follows: The birx degree in individual internodes from the top of the stem to the bottom was fluctuated as low-high-low. The values of birxes in the 4th, 5th and 6th internotes counted from the top of the stem were the highest, while it was the lowest in the 1st internote. The mean birx of all internodes and the mean birx of the whole stem were very similar to those of the 10th and 11th internotes, suggesting that the birx value of the whole stem could be represented with the values of either internote. The brix degrees of the individual internodes of the 6th,7th,13th,3rd and 2nd internodes had high directly positive effects on the birx of the whole stem. The birx degree of the 10th internode had a low directly positive effect on the birx of the whole stem. The birx degree of the 11th, 12th, 4th and 9th internodes had high directly negative effects on the birx of the whole stem.