Qassim region is considered an urban, agricultural area in the Kingdom of Saudi Arabia. This region is characterized by dominant arid climate. Low fertility soil is considered a major challenge for the sustainable cultivation of wheat (Triticum aestivum L.). The objective of this study was to assess some agronomic characteristics of the wheat genotypes grown organically on low fertility soil. The experi- ments were conducted during the 2010 and 2011 growing seasons using eight bread wheat genotypes growing under conventional and organic farming systems at two different locations. measurements of the following parameters were collected: chlorophyll content, flag leaf area (cm2), and Harvest Index. Findings demonstrate a difference between the conventional and organic farming systems in terms of the parameters under study. Results showed that the greatest chlorophyll content was recorded in IC17 genotype (51.3 SPAD) Genotype Sids 12 had the highest FLA (28.0 and 26.3) under the conventional and organic farming systems, respectively. E-line and YR had the highest harvest index under the organic farming system in both the seasons. For sustainable food production in arid regions using the organic farming system, wheat genotypes YR and E-line could be the most suitable.
arid region, conventional system, organic system, sustainable agriculture, wheat genotype
 Bos, C., Juillet, B., Fouillet, H., Turlan, L., Dare, S., Luengo, C., N`tounda, R., Benamouzig, R., Gausseres, N., Tome, D. & Gaudichon, C., Postprandial metabolic utilization of wheat protein in humans. The American Journal of Clinical Nutrition, 81(1), pp. 87–94, 2005. https://doi.org/10.1093/ajcn/81.1.87
 Abril, A., Baleani, D., Casado-Murillo, N. & Noe, L., Effect of wheat crop fertilization on nitrogen dynamics and balance in the Humid Pampas, Argentina. Agriculture, Ecosystems & Environment, 119(1–2), pp. 171–176, 2007. https://doi.org/10.1016/j.agee.2006.07.005
 Graham, P.H. & Vance, C.P., Nitrogen ﬁxation in perspective: an overview of research and extension needs. Field Crops Research 65(2–3), pp. 93–106, 2000. https://doi.org/10.1016/s0378-4290(99)00080-5
 Pimentel, D., Green revolution and chemical hazards. Science of the Total Environment, 188(supplement), pp. S86–S98, 1996. https://doi.org/10.1016/0048-9697(96)05280-1
 Murray, U., Jeff, B. & Matthew, F., Variability in harvest index of grain crops and potential significance for carbon accounting: Examples from Australian agriculture. Advances in Agronomy, ed. D.L. Sparks, pp 173–219, Elsevier, 2010.
 Sylvester, B.R., Stokes, D.T. & Scott, R.K., A physiological analysis of the diminishing responses of winter wheat to applied nitrogen, 1. Theory. Aspects of Applied Biology, pp. 277–287, 1990.
 Tilman, D., Cassman, K.G., Matson, P.A., Naylor, R. & Polasky, S., Agriculture sustainability and intensive production practices. Nature, 418(6898), pp. 671–677, 2002. https://doi.org/10.1038/nature01014
 Ryan, M.H., Derrick, J.W. & Dann, P.R., Grain mineral concentrations and yield of wheat grown under organic and conventional management. Journal of the Science of Food and Agriculture, 84(3), pp. 207–216, 2004. https://doi.org/10.1002/jsfa.1634
 Stanhill, G., The comparative productivity of organic agriculture. Agriculture. Ecosystems & Environment, 30(1–2), pp. 1–26, 1990. https://doi.org/10.1016/0167-8809(90)90179-h
 Kirchmann, H., Bergström, L., Kätterer, T. & Gesslein, S., Comparison of long-term organic and conventional crop–livestock systems on a previously nutrient-depleted soil in Sweden. Agronomy Journal, 99(4), pp. 960–972, 2007. https://doi.org/10.2134/agronj2006.0061
 Al-Ghumaiz, N.S., Yield performance quality of eight wheat genotypes under organic and conventional farming systems in Saudi Arabia. Agriculture and Food, 2, pp. 20–24, 2014. [Online] Available: http://www.scientific-publications.net/en/article/1000002/
 MSTATC. A microcomputer program for the design. Management, and Analysis of Agronomic Research Experiments. Michigan State University East Lansing, MI, USA. 1990.