Bobur Rashidov, a university teacher, told RFE/RL that an average of five to 10 students who do not attend or leave the compulsory work in the cotton fields are expelled from his university on an annual basis.
He said that of some 3,000 students at his university -- which he asked not be named -- about 1,000 do not participate in the obligatory cotton harvest.
Rashidov added that this is the case in the majority of high schools and universities in Uzbekistan.
He said that some of the nonparticipating students are threatened with expulsion unless they pay $130-$600 to university officials.
A student from the western Karakalpakstan region told RFE/RL that it was extremely difficult to get a medical exemption from the cotton harvest if someone was physically unable to work.
He said one student with a broken hand had to pay the medical commission in order to get an exemption.
Another Uzbek university official told RFE/RL that they are told that students opting out of the cotton harvest should be expelled.
Uzbekistan is the second-largest cotton exporter in the world and has been criticized frequently by international organizations about its use of children and students to harvest cotton.
The practice has prompted boycotts in the past.