Modern ag is all no-till and low-till and has been since the 1980s. The old fashioned plow is non-existent anymore. Even when a farmer does till, it is a with a tool that is rarely even called a plow (there are several types of tillage tools in common use with different properties, but none turn the soil over or exchange soil layers)
Modern ag can build topsoil - sometimes at rates as high as 1mm/year!
Modern ag can build topsoil - sometimes at rates as high as 1mm/year!