Building a New Silage Pit to Store Feed for Our Cattle 

Welcome to the channel and thank you!

You're right that plastic is not completely eliminated, but it is greatly minimized.

@@cannonranch tires hold water- water breeds mosquitoes-not good-very messy to handle

That is a great point. Thankfully we have yet to have any issue with mosquitoes or standing water, but that could be due the near constant high winds we get out here during the afternoon. The pit also has rather high walls (around 18ft), giving most of the silage cover by way of concrete block (we added two more last year). There are only a handful of tires along the top with ample spacing in-between.