Abstract: Using GT58 sugarcane varieties as experimental materials, the foliar spray was applied with clear water as the control（CK）, and the self-developed yield and sugar-enhancing agent was used for foliar spraying. The changes of sugar accumulation in the upper, middle and lower nodes were analyzed under natural conditions and under spraying yield and sugar enhancers treatment. The results showed that under natural conditions, the sugar content in the lower segments reached 7.05% at the 7th to 8th nodes, and 13.24% at the 20th to 22nd nodes, with an accumulation period of 100 to 110 days; the sugar content in the middle segments was 6.85% at the 11th to 13th nodes and increased to 13.24% at the 20th to 22nd nodes, with an accumulation period of 50 to 60 days; in the upper segments, the sugar content was 4.16% at the 16th to 18th nodes and reached 13.15% at the 23rd to 25th nodes, accumulating over 30 to 40 days. Sugar accumulation from the 11th to 22nd nodes accounted for 63.9% of the total accumulation during the growth of internodes. After spraying the yield and sugar-enhancing agent, the sugar content in the upper, middle, and lower segments during the T₁ （11th to 13th node） to T₂ （16th to 18th node） period was lower than that of the control; however, by the T₃ （20th to 22nd node） period, the sugar content in the upper segments was significantly higher than the control, while the differences in the middle and lower segments were not significant. By the T₄ （23rd to 25th node） period, the sugar content in the upper, middle, and lower segments had increased by 0.96, 1.04, and 0.93 percentage points, respectively, compared to the control.

Key words: sugarcane, the yield and sugar-enhancing agent, sugar accumulation, changing characteristics, chemical regulation