The transcript, read with the diploma. It shows the program and coursework, which lets the officer decide whether the degree is in a field related to Agriculturist. A credential evaluation is required only for degrees from outside Canada, Mexico or the United States.
Let the transcript explain what the diploma title does not
The regulation asks for a baccalaureate or licenciatura degree for Agriculturist, and the Department of State's guidance expects the degree to be in a field related to the profession. A diploma reading Bachelor of Science with no field stated, or a title such as Agricultural and Environmental Sciences, is resolved by the transcript, which lists the program and the courses in soil science, crop production and plant pathology that make the connection. Present the diploma, the transcript and certified English translations of both.
If the degree was earned at an institution outside the three USMCA countries, obtain a credential evaluation from a reliable service before applying, since the regulation requires it and a port-of-entry officer cannot supply it. Do not add a general letter from the university describing the applicant as an agronomist; the transcript is the deciding record and an opinion letter adds little.