Abstract
AbstractSurface application of ammonium sulfate (AMS) as S source to soils with pH ≥7.0 is subjected to ammonia (NH3) volatilization. However, AMS volatilizes less NH3 than urea does. In soils with pH <7.0, unlike urea, very little NH3 volatilization from AMS occurs. The associated N with AMS may enhance early biological N fixation by leguminous crops as compared to S sources without N such as polyhalite.
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