Other chickens walk around the bale browsing around the edges of the bale, and eating the alfalfa flakes that get scratched off onto the ground by the upper chickens. Alfalfa is a very nutritious food crop. Alfalfa sends it's roots deep into the soil.
Soil or Waste Stacks. A soil or waste stack (normally just called a stack) is a drainage pipe that passes through at least one story(floor to ceiling) as a drain pipe, this also includes any horizontal offsets. Every soil or waste stack will terminate in a stack vent that leads to outside air or a vent header.
A combination of vertical pipes with fittings forms the stack in a plumbing waste system. It is used for waste disposal and venting. The main stack is composed of three sectionsâthe soil stack, waste stack, and vent stack. A soil stack carries waste disposal from water closets. A waste stack carries waste disposal from all other fixtures. A vent stack provides air circulation throughout the waste system and allows for the release of sewer gases.