The Secretary may sample without charge any commercial fertilizer or soil conditioner to determine if it complies with the requirements of the Maryland Commercial Fertilizer Law, Agriculture Article, §§6-201—6-221, Annotated Code of Maryland. A sample of not less than 1 pound of a commercial fertilizer or soil conditioner shall be taken by the Secretary from containers, as follows: For a lot of five to ten containers a sample shall be taken from all containers; For a lot of more than ten containers a sample shall be taken from only ten containers. Ten core samples shall be taken by the Secretary from each bulk lot. Each sample shall be taken from original unbroken bags or containers when the contents have not been damaged by exposure, water, or other conditions. A homogeneous sample, as determined by the Secretary, may be taken from a liquid or fluid lot of commercial fertilizer.