The principal silage crop is corn, but in different parts of the country there are other crops which can be used to great advantage as substitutes for corn. Among these are kaffir corn, sorghum, alfalfa, clover, millet, cowpeas, soy-beans, sugar beets, oats and even weeds and thistles. All of these make good silage when properly harvested and stored. Any green fodder can be mixed with the above to make quantity and secure good results. The main point to be remembered is that the crops to be put away in the silo must contain a certain percentage of sugar and starch in every combination.