Section 80. The commissioner or his deputy may publish annually, in such forms as he may deem proper, information concerning the sales of commercial fertilizers, soil conditioners, and agricultural liming materials; together with such data on their production, composition and use as he may consider advisable, and a report of the results of the analyses of official samples of said products sold within the commonwealth as compared with the analyses guaranteed in the registration and on the label; but any information relating to the general business of any applicant or licensee shall be treated by the commissioner as confidential.