Excerpt from Sweet Clover for Nitrate Production
Sweet clover offers the most promising indications that the problem of supplying a cheap source of nitrate nitrogen for farm crops can be solved. With the exception of manure, the animal sources of nitrogen, such as tankage, dried blood, fish meal, guano, and others, are limited in quantity, and their price is such that to use any of them except manure, as a source of nitrogen for crop growth, is out of the question. The chemicals, Chili saltpeter or sodium nitrate, calcium nitrate, ammonium nitrate, ammonium sulfate, ammonium phosphate, calcium cyanamid, and others are likewise too expensive to apply to soils on which staple crops are to be grown.
The need for special studies to determine the value of sweet clover (melilotus alba, sometimes called bee clover) for nitrate production, when employed as a green manure, was made apparent by the pre liminary studies made in 1917 on the University North Farm, at Urbana. Consequently extended investigations were conducted dur ing the season of 1919 on certain of the outlying experiment fields in addition to continuing those already initiated at Urbana.
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