Fertilizers in recent years have been used by more and more farmers and by gardeners. Where soils are deficient in nutrients, applications of the right fertilizer have resulted in appreciable yield increases. Because some of these deficiences are wide-spread, farmers and gardeners have become conscious of the benefits which can come from wise fertilzer use.
Stritzel, J. A.
"About Liquid Fertilizers,"
Iowa Farm Science: Vol. 8
, Article 8.
Available at: https://lib.dr.iastate.edu/farmscience/vol8/iss2/8