A description of the agronomic advice, trials and technical support the role delivers, the growers and dealers served, the supervising agronomist or manager, the salary, the duration and a statement that the applicant holds no interest in the company. The letter should quote the employer's real job description.
A letter built from the employer's answers, not from a template
Officers read support letters every day and recognize a template. The letter that works is one that repeats, in the employer's words, what the agronomist will do: the crops and regions covered, the kind of recommendations issued, the field trials designed or monitored, the data reported, the dealer training delivered and the person who reviews that work. It should state the degree required for the position and why, name the applicant's degree and institution, give the start and end dates of the temporary engagement and the salary, and say plainly that any commission is a minor supplement.
It should also confirm the applicant owns no share of the company. Attach the employer's internal job description if one exists; consistency between the two is persuasive. Add the diploma, transcript and certified translations.
The applicant should read the letter and be able to describe every duty in it without prompting.