Assertion: urea | /r/HasProperty | added
Facets:
Source sentences:
text: 46 Urea and Other Nonprotein Nitrogen Compounds in Animal Nutrition low-productivity diets further improved animal performance when urea was added.
text: It should be understood at the outset that when urea is added according to this invention to concentrated formaldehyde solutions which are in viscous to fluid condition there is a rapid drop in temperature, due to the negative heat of solution of the urea.