Abstract:

A pot experiment was designed to observe the effect of winter wheat yield, nitrogen utilization (Agronomic N use efficiency (AE), Apparent N recovery efficiency (NRE) and Physiological N use efficiency (PNUE)) and harvest index of three new kinds of organic coated urea fertilizers. The results showed that: The organic coated urea could significantly increase the winter wheat yield and nitrogen use efficiency compared with general urea in the same nitrogen (N) application rate. Under the fertilizer application level of include N 0.10 g/kg soil and include N 0.20 g/kg soil, the yield increase rate of organic coated urea2 (YU2) compared with general urea were 12.7%, 19.4%, respectively, and the increase rate of NRE were 14.8%, 10.8%, respectively. All the 3 kinds of organic coated urea fertilizers increased the AE, PNUE and harvest index in varying degrees compared with general urea under include N 0.20 g/kg soil N application level which the PNUE and harvest index increase rate of the organic coated urea3 (YU3) were 0.83 kg/kg and 2.56%, respectively with a significant difference; and the YU2 played the most important role in AE increase with the rate 4.04 kg/kg, 3.64 kg/kg, respectively, under include N 0.10 g/kg soil and include N 0.20 g/kg soil.