Treatments	Number of composite samples	Soil depth	Soil nitrogen content ( % )
Treatments	Number of composite samples	Soil depth	Crop season 2009/2010	Crop season 2009/2010
Continuous injection of the dissolved urea	18	0 - 60 cm	0.43	0.43
Injection of the urea during the first half of irrigation time	18	0 - 60 cm	0.27	0.32
Injection of the urea during the second half of irrigation time.	18	0 - 60 cm	0.18	0.20
Mechanical application of urea	18	0 - 60 cm	0.14	0.11
Mean			0.25	0.26
CV %			13	15
SE+			0.18	0.04