Effect of hydroquinone, dicyandiamide and encapsulated calcium carbide on urea N uptake by spring wheat, soil mineral N content and N2O emission
1998
Chen, L. | Boeckx, P. | Zhou, L. | Cleemput, O. van | Li, R.
At present about half of the N fertilizer used in China is as urea. However, recovery of urea N in crops is often limited to 30-40%. Application of urea in combination with hydroquinone plus dicyandiamide (U-HQ-DCD) gave an improved urea-N recovery and grain yield by spring wheat in a pot experiment. The apparent total urea-N recovery was 69% and 73% of this recovered N was found in the grain. The grain yield was 32% higher than in the treatment where urea was applied without inhibitors. The application of hydroquinone and dicyandiamide also resulted in a smaller soil nitrate content, which might restrict post-harvest leaching of N. Another beneficial effect of these inhibitors was that the N2O emission from the soil--plant system was reduced by 35% compared to the treatment where only urea was applied. The use of urea in combination with hydroquinone plus encapsulated calcium carbide gave smaller beneficial effects.
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