top | item 33903703 (no title) ljw1004 | 3 years ago Those numbers are easy to find on google! Iowa 14-18" average topsoil depth in 1900, 6-8" in 2000. I'm not sure anyone could tell acceleration/deceleration over this timescale. discuss order hn newest JoeAltmaier|3 years ago And topsoil is not very significant anyway. Corn doesn't need it, much.My field was eroded clay when I bought it 20 years ago. Left fallow (well, planted in cover crops) it now has 4" topsoil. It can also rebuild you see.
JoeAltmaier|3 years ago And topsoil is not very significant anyway. Corn doesn't need it, much.My field was eroded clay when I bought it 20 years ago. Left fallow (well, planted in cover crops) it now has 4" topsoil. It can also rebuild you see.
JoeAltmaier|3 years ago
My field was eroded clay when I bought it 20 years ago. Left fallow (well, planted in cover crops) it now has 4" topsoil. It can also rebuild you see.