To increase sugar production in sugarcanes, they are sprayed with

1. IAA

2. cytokinin

3. gibberellin

4. ethylene


(c) Gibberellin spray on sugarcane induces the growth in the internodal area of the sugarcane plant. Larger is the area larger will the sugar content, as sucrose is the main constituent in the of sap of sugarcane stem.
Page 249, XI NCERT