Shrader, W.Bartholomew, W.Englehorn, A.2021-02-252021-02-251956-02-01https://dr.lib.iastate.edu/handle/20.500.12876/94772<p>Soil is a storehouse of fertility is an idea as old as agriculture itself. More recently this idea has been pictured with the soil behaving as a bank- with "deposits" made in the form of crop residues, manures and fertilizers and "withdrawals" made in the form of harvested crops. This is the concept with which this article deals.</p>articleisulib-bepress-aws-west201820518112farmscience/vol10/iss8/3Agriculture