Effect of dicyandiamide and hydroquinone on the transformation of urea-nitrogen-15 in soil cropped to wheat
2001
Xu, X.K. | Huang, Y. | Zhou, L.K. | Huang, G.H. | Cleemput, O. van
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-(15)N than treatments based on the application of urea alone or urea plus HQ. Most of the urea-(15)N applied to soil was present as organic plus chemically fixed (15)N in the DCD and DCD plus HQ treatments. These two treatments showed the smallest accumulation of urea-derived (NO3(-)+NO2(-)-(15)N. Under well-drained conditions, there was a synergistic effect of the nitrification inhibitor DCD and the urease inhibitor HQ on urea-(15)N transformations and the recovery of fertilizer (15)N in soil after the application of urea.
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