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.
Shrader, W. D.; Bartholomew, W. V.; and Englehorn, A. J.
"Can Your Soil "Store" Meadow,"
Iowa Farm Science: Vol. 10
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol10/iss8/3