Much interest has been manifested in the production of artificial manures since Hutchinson and Richards first suggested the process in 1921. They found that straw could be converted into a good grade of manure and also that if a proper proportion of the reagents and optimum moisture conditions were maintained, decomposition was very rapid. They recommended the addition to the straw of 14 pounds of nitrogen as ammonium sulfate, enough finely ground limestone to neutralize the acidity produced, and sufficient water to wet the straw and keep it moist.
Proceedings of the Iowa Academy of Science
©1929 Iowa Academy of Science, Inc.
Smith, Frederick B.
"The Rate of Decomposition of Some Artificial Manures,"
Proceedings of the Iowa Academy of Science, 36(1), 69-73.
Available at: https://scholarworks.uni.edu/pias/vol36/iss1/9