A Perspective on Balanced Fertilization in the Mediterranean Region

The demands on agriculture to produce food and fibre are driven by the inexorable increases in the world's population. However, advances in agricultural science in the past century have helped food production to keep pace with population growth, thus keeping hunger and malnutrition at bay. The achievements in enhanced agricultural output, especially in the developed world, are attributed to 3 main factors: expansion of irrigation, development of improved higher-yielding, disease-resistant crop cultivars, and chemical fertilizers. Fertilizers are fundamental to producing more crop output from existing land in cultivation. Along with increased fertilizer use comes greater concern about the environment in view of the potential for pollution arising from excessive and inappropriate nutrient use. The past half century has seen a rapid expansion in the Western world in the use of chemical fertilizers, especially nitrogen (N) and phosphorus (P), and potassium (K) to a lesser extent. These developments are more recent for lesser-developed countries, but have nonetheless stimulated major increases in crop yields, and indeed crop quality. In the West Asia-North Africa (WANA) region, most countries have experienced increases of 10-20-fold in the use of N and P fertilizers in the past 3 decades in both dryland and irrigated agriculture. Viable agricultural production in the Mediterranean region is not possible without chemical fertilizer use. Applied research has shown the benefits of the major nutrients, and their requirements for maximum economic crop production; it also has identified new production constraints, such as micronutrients, for a range of crops, as the yield possibilities are raised by irrigation, improved varieties, and better management. The fact that crops need variable amounts of nutrients and that no one essential nutrient can substitute for another, in addition to the economic and environmental implications of excessive nutrient use, raises the issue of ´´balanced fertilization´´. This concept, in essence, implies tailoring individual nutrient needs of crops according to their physiological requirements and expected yields. As fertilizer use is universal and is influenced by soil and climatic factors, in addition to crops, the issue of nutrient balance is particularly relevant. In this presentation, the author briefly examines balanced fertilization in the context of the Middle East region, with particular emphasis on experiences in Syria, which hosts the International Center for Agricultural Research in the Dry Areas. Future challenges for the agricultural research and fertilizer sectors are highlighted in order to most effectively combine efficient crop production with environmental protection.

Anahtar Kelimeler:

Dryland agriculture, irrigated crop production, cropping intensification, nutrient use efficiency, Middle East region, rational fertilization, fertilizer use

A Perspective on Balanced Fertilization in the Mediterranean Region

Keywords:

Dryland agriculture, irrigated crop production, cropping intensification, nutrient use efficiency, Middle East region, rational fertilization, fertilizer use,

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Abdel Monem, M.A.S. 1986. Labelled Urea Fertilizer Experiments on Arid Soils of the Mediterranean Region. Ph.D. Dissertation, Colorado State University, Fort Collins, CO, USA. p. 109.
Borlaug, N.E. and C.R. Dowswell. 1994. Feeding a human population that increasingly crowds a fragile planet. Keynote lecture. World Soils Congress, Acapulco, Mexico, July 10-16.
Borlaug. N.E. 2003. Feeding a world of 10 billion people: the TVA/IFDC legacy. Travis P. Hignett Memorial Lecture, March 14, Muscle Schools, Alabama, USA.
Cooper, P.J.M., P.J. Gregory, D. Tully and H.C. Harris. 1987. Improving water-use efficiency of annual crops in the rainfed farming systems of West Asia and North Africa. Expl. Agric. 23:113-158.
Damania, A.B., J. Valkoun, G. Wilcox and C.O. Qualset. 1998. The Origins of Agriculture and Crop Demonstration. The Harlan Symposium. ICARDA (IPGRI, FAO, GRCP), Aleppo, Syria.
Gibbon, D. 1981. Rainfed systems in the Mediterranean region. Plant and Soil. 58: 59-80.
Harris, H.C. 1995. Long-term trials on soil and crop management at ICARDA. Adv. Soil Sci. 19: 447-469.
Harmsen, K. 1984. Nitrogen fertilizer use in rainfed agriculture. Fert. Res. 5: 317-382.
Ibrikci, H., J. Ryan, A.C. Ulger, G. Buyuk, B. Cakir, K, Kormaz, E. Karnez, G. Ozgenturk and O. Konuskan. 2005. Maintenance of phosphorus fertilizer and phosphorus effect on corn production. Nutr. Cycl Agroecosyst. 72: 279-286.
IFADATA, 2006. Statistics: Production, Imports, Exports, and Consumption Data for Nitrogen, Phosphate and Potash Fertilizers. International Fertilizer Industry Association (IFA), Paris, France.
Johnston, A.E. 1997a. The Efficient Use of Plant Nutrients in Agriculture. International Fertilizer Industry Association (IFA), Paris, France.
Johnston, A.E. 1997b. Food Security in the WANA Region: The Essential Need for Balanced Fertilization. Proceedings, International Workshop, Ege University, Bornova, İzmir, Turkey. International Potash Institute, Basel, Switzerland.
Kassam, A.H. 1981. Climate, soil and land resources in West Asia and North Africa. Plant and Soil. 58: 1-28.
Masri, Z. and J. Ryan. 2006. Soil aggregation and related physical properties in a wheat-based, long-term rotation trial. Soil and Tillage Res. 87: 146-154.
Matar, A., J. Torrent and J. Ryan. 1992. Soil and fertilizer phosphorus and crop responses in the dryland Mediterranean zone. Adv. Soil Sci. 18: 82-146.
Materon, L.A., and J. Ryan. 1995. Rhizobial inoculation, and phosphorus and zinc nutrition for annual medics (Medicago spp.) adapted to Mediterranean-type environments. Agron. J. 87: 692- 698.
Oweis, T., M. Pala and J. Ryan. 1998. Stabilizing rainfed wheat yields with supplemental irrigation in the Mediterranean region. Agron. J. 90: 672-681.
Pala, M., H.C. Harris, J. Ryan, R. Makboul and S. Dozom. 2000. Tillage systems and stubble management in a Mediterranean-type environment in relation to crop yield and soil moisture. Expl. Agric. 36: 223-242.
Pala, M., J. Ryan, A. Mazid, O. Abdallah and M. Nachit. 2004. Wheat farming in Syria: An approach to economic transformation and sustainability. Sustainable Agric. and Food Systems. 19: 30-34.
Rao, S. and J. Ryan (Ed.) 2004. Challenges and Strategies of Dryland Agriculture. Crop Science Society of America, Special Publ. No: 32, Madison, WI., USA.
Roy, R.N., A. Finck, G.J. Blair and H.L.S. Tandon. 2006. Plant Nutrition for Food Security: A guide to integrated nutrient management. Fert. and Plant Nutr. Bull. No: 16, FAO, Rome, Italy.
Ryan, J. and A. Matar (Ed.) 1990. Soil Test Calibration in West Asia and North Africa. Proceedings, Fourth Regional Soil Test Calibration Workshop. Amman, Jordan, Sept. 2-9, ICARDA, Aleppo, Syria.
Ryan, J. and A. Matar (Ed.) 1992. Fertilizer Use Efficiency under Rainfed Agriculture. Proceedings, Fourth Regional Soil Test Calibration Workshop. Agadir, Morocco. May 5-11, 1991. ICARDA, Aleppo, Syria.
Ryan, J. and S. Garabet. 1994. Soil test standardization in West Asia- North Africa. Commun. Soil Sci. & Plant Anal. 25 (9 and 10): 1641-1655.
Ryan, J. (Ed.). 1997. Accomplishments and Future Challenges in Dryland Soil Fertility Research in the Mediterranean Region. Proceedings. Soil Fertility Workshop, Tel Hadya, Aleppo, Syria. ICARDA, Aleppo, Syria.
Ryan, J.S. Masri, S. Garabet, J. Diekmann and H. Habib. 1997. Soils of ICARDA’s Agricultural Experiment Stations and Sites: Climate, Classification, Physical and Chemical Properties, and Land Use. Technical Bulletin, ICARDA, Aleppo, Syria.
Ryan, J. 1998. Changes in organic carbon in long-term rotation and tillage trials in northern Syria. In: Management of Carbon Sequestration in Soil (Eds.: R. Lal, J. Kimble, R. Follett and B.A. Stewart). Adv. Soil Sci., CRC, Boca Raton, Florida, pp. 285-295.
Ryan, J. and M. Abdel Monem, 1998. Soil fertility for sustained production in the West Asia-North Africa region: Need for long- term research. In: Soil Quality and Agricultural Sustainability (Ed. R. Lal). Ann Arbor Press, Chelsea, MI, USA, pp. 55-74.
Ryan, J., S. Garabet, A. Rashid and M. El Gharous. 1999. Soil laboratory standardization in the Mediterranean region. Commun. Soil Sci. & Plant Anal. 30 (5&6): 885-894.
Ryan, J. 2000. Plant Nutrient Management under Pressurized Irrigation Systems in the Mediterranean. Proceedings, International Workshop, April 25-27, 1999. Amman, Jordan. ICARDA, Aleppo, Syria, and IMPHOS, Casablanca, Morocco.
Ryan, J. 2002. Available soil nutrients and fertilizer use in relation to crop production in the Mediterranean area. In: Soil Fertility and Crop Production (Ed. K.R. Krishna), Science Publ., Inc., Enfield, New Hampshire, USA, pp. 213-246
Ryan, J. 2004. Soil fertility enhancement in Mediterranean-type dryland agriculture: a perspective for development. In: S. Rao and J. Ryan (Ed.) Challenges and Strategies of Dryland Agriculture (Eds.: S. Rao and J. Ryan). Crop Science Society of America, Special Publ. No. 32, Madison, WI., USA. p. 275-2990
Ryan, J. 2004. Soil fertility enhancement in Mediterranean-type agriculture: a perspective for development. In: Challenges and Strategies of Dryland Agriculture (Eds.: S. Rao and J. Ryan). Crop Science Society of America, Special Publ. No. 32, Madison, WI., USA, pp. 243-256.
Ryan, J., E. De Pauw, H. Gomez and R. Mrabet. 2006. Drylands of the Mediterranean zone: biophysical resources and cropping systems. In: Dryland Agriculture, 2nd ed. (Ed.: G.A. Peterson, P.W. Unger, and W.A. Payne), Agronomy Monograph, American Society of Agronomy, Madison, WI, USA, pp. 557-624
Ryan, J., H. Ibrikci, A. Rashid, S. Masri, M. Pala, A. Matar and M. Singh. 2008. Residual and currently applied phosphorus in dryland cereal/legume rotations across a rainfal gradient in a Mediterranean ecosystem. Eur. J. Agron. 28:126-137.
Shroyer, J.P., J. Ryan, M. Abdel Monem and M. El Mourid. 1990. Production of fall-planted cereals in Morocco and technology for improvement. J. Agron. Educ. 19: 32-40.
Stewart, W.M., D.W. Dibb, A.E. Johnston and T.J. Smyth. 2005. The contribution of commercial fertilizer nutrients to food production. Agron. J. 97: 1-6.
Yau, S.K., M.M. Nachit, J. Ryan and J. Hamblin. 1995. Phenotypic variation of boron toxicity tolerance in durum wheat at seeding stage. Euphytica. 83: 185-191.