Any such farm marketing center may include a cannery, a creamery, a meat-packing house, an assembly plant for poultry and eggs, a feed-grinding and mixing plant and any other equipment necessary and proper for the processing and preparing for market of any of the products of the farms of this State, so as to enable the farmers to diversify their products and to find markets for them at fair and reasonable prices. Any such farm marketing center may include any one or more of the projects and processing equipment mentioned above, at the discretion of the proper officers.