28. Subject to the rights and privileges expressly granted by law to other professionals, no person shall perform any act described in section 24 unless he is an agrologist.
This section shall not apply to acts performed:(a) by an artisan, workman or farmer as such;
(b) by any person who was performing such acts in carrying on his occupation before the 1st of January 1961;
(c) by an agricultural technician or technologist working under the supervision of an agrologist;
(d) in scientific research;
(e) by students in agrology undergoing a period of professional training in accordance with this Act and the regulations of the Bureau.