1. Upon satisfactory evidence that the registrant or licensee has used fraudulent or deceptive practices or has willfully violated any provisions of this chapter or any rules and regulations promulgated under this chapter, the secretary is authorized and empowered to do any of the following:

 a. Cancel the registration of any product of commercial fertilizer or soil conditioner or license.
 b. Refuse to register any product of commercial fertilizer or soil conditioner.
 c. Refuse to license any applicant.
 2. However, a registration or license shall not be revoked or refused until the registrant or licensee has been given the opportunity to appear for a hearing by the secretary.