INTRODUCTION (Calibri 14 Bold)

With the high rate and expense of N fertilizer presently used in modern agriculture, nitrate leaching from agricultural soils has long been considered as a major environmental problem. Several investigators have identified the most decisive factors determining the magnitude of leaching losses (Avnimelech and Raveh, 1976; Gustafson, 1983; Bergstrom and Brink, 1986; Bergstrom and Johansson, 1991).

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MATERIALS AND METHODS (Calibri 14 Bold)

Soil (Calibri 12 Bold): The soil used in the present experiment was collected from surface layer (0-30 cm) from Kharj Government (Haradh road), Riyadh, Saudi Arabia. The texture was sandy loam. Some physical and chemical properties were performed according to the methods described in Carter (1993) and Klute (1986), Table (1). (Calibri 12) – single space

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RESULTS  (Calibri 14 Bold)

The observed NO₃ concentrations in the leachate at different time intervals as affected by water flux density and date palm by-products powder are presented in Tables (4, 5 ,6 and 7). (Calibri 12) – single space

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DISCUSSION (Calibri 14 Bold)

Application of agricultural fertilizers, animal farming, atmospheric deposition, and industrial and wastewater discharges are the potential sources of groundwater contamination (Aelion and Conte, 2004). (Calibri 12) – single space

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Acknowledgment (Calibri 14 Bold)

The authors would like to express great thanks to the Agricultural Research Center and the Deanship of Scientific Research, King Saud University for funding this research through the project supported by Saudi Basic Industries Corporation (SABIC). (Calibri 12) – single space

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REFERENCES (Calibri 14 Bold)

An article with an author:
Goodwin, J. (2009) ‘Whatever happened to the young workers? Change and transformation in 40 years of work’, Journal of Education and Work, 22(5), pp. 417-431.

An article with no author:

Coffee drinking and cancer of the pancreas (Editorial) (1981) British Medical Journal, 283(6292), p. 628.  

Solo Author

Abdel-Nasser, G. 2001(Calibri 12 Bold). Laboratory study of groundwater pollution with nitrate. 1- Effect of N-fertilization rate and soil texture. J. Agric. Sci. Mansoura Univ., 26(10): 6591-6606. (Calibri 12 )- single space

Two authors

Al-Darby, A. M. and G. Abdel-Nasser. 2006.Nitrate leaching through unsaturated soil columns: comparison between numerical and analytical solutions. J. Applied Science, 6(4): 735-743. (Calibri 12 )- single space

Three or more authors

Cameria, M. R., R. M. Fernando and L. S. Pereira. 2003. Monitoring water and NO₃-N in irrigated maize fields in the Sorraia watershed. Agricultural Water Management, 60: 199-216. (Calibri 12 )- single space

Books

Carter, M. R. (ed.). 1993. ”Soil Sampling and Methods of Analysis”. Canadian Society of Soil Science, CRC Press, 823 pp. 2^ed Ed. (Calibri 12 )- single space

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