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Synopsis: Losses of nitrogen as ammonia during 7 days following surface application of 100 pounds of dry urea-nitrogen were 20 to 30% for 4 different grass sods, and 17 to 59% for acid light sandy soils. Losses from ammonium nitrate or ammonium sulfate were negligible. Losses From urea solution were similar to those from dry urea for turf but much less for soils.
2 Soils Chemist, Florida Agr. Exp. Sta., Gainesville, Fla. The author expresses appreciation to Mladen Zupan for assistance in the study.
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