Disk plows are similar to moldboard plows in that they are a primary tillage tool and each bottom or disk is carried by itself (if your plow has a Gang of disks you have a Disk Tiller rather than a disk plow). Disk plows began as horse drawn tools and adapted for tractor use. They were excellent tools for tilling rough ground (sometimes called new ground or newly cleared ground) with lots of saplings, roots, stalks, and rocks. In southern regions they are sometimes referred to as 'Round Bottom Plows'. Today survival rates for disk plows is particularly low due to the conditions to which they were often subjected. Those implements which still survive are often in poor condition with missing parts and welding/ brazing a common feature.