Abstract
A pot experiment with a loam soil and spring wheat as test crop showed that an application of dicyandiamide (DCD), and especially its combination with hydroquinone (HQ), gave a much larger recovery of soil urea-15N than treatments based on the application of urea alone or urea plus HQ. Most of the urea-15N applied to soil was present as organic plus chemically fixed 15N in the DCD and DCD plus HQ treatments. These two treatments showed the smallest accumulation of urea-derived (NO3–+NO2–)-15N. Under well-drained conditions, there was a synergistic effect of the nitrification inhibitor DCD and the urease inhibitor HQ on urea-15N transformations and the recovery of fertilizer 15N in soil after the application of urea.
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