pit silo, tench silo, farm management, agriculture department
Cooperative Extension Service, South Dakota State College of Agriculture and Mechanic Arts
Pit and trench silos are often confused, in name. The pit silo is cylindrical in form, and deep. It is the same shape as the above-ground silo and extends below the ground. There are several good reasons for making pit silos in this shape. They have the greatest capacity for the amount of side-wall required, they are easier to build, the silage settles in them better, and the wall (plastered or other) is stronger. Pit silos have been used for many years and have given excellent satisfaction: They are used for storing the most valuable silage crops and can be relied upon to preserve the silage as well, if not better, than the superstructure, when they are properly built. Feed can be stored in them from one season to the next just the same as in the above-ground silo and they have an advantage as far as the freezing of the silage in winter is concerned. These advantages are listed below.
Patty, R. L., "Pit and Trench Silos" (1927). SDSU Extension Circulars. 263.