Abdo W, Geremew B, Asafa T (2012). Effect of different nitrogen fertilizer rates on yield and yield related traits for seven durum wheat (Triticum turgidum L. var Durum) cultivars grown at Sinana, South Eastern Ethiopia. African Journal of Food, Agriculture, Nutrition and Development 12(3):6079-6094.

Ali AG, Omar MA, Nawar AI, Tabbakh SS (2016). Effect of Sowing Date and Nitrogen Fertilization Level on Growth and Productivity of Some Durum and Bread Wheat Varieties. Journal of Alexandria Science Exchange 37(4):542-549.

Assefa M, Johnson MRS, Nyambilila A, Tekalign M (2015a). Wheat Response to Applied Nitrogen, Sulfur and Phosphorous in three Representative Areas of the Central Highlands of Ethiopia. International Journal of Plant and Soil science 8(5):1-11.

Assefa W, Yemane N, Dawit H (2015b). Planting Density, and Nitrogen and Phosphorus Fertilization Effect on Different Bread Wheat (Triticum aestivum L.) Genotypes in Southern Tigray, Ethiopia. Journal of World Science Research 3(2):20-28.

Bereket H, Dawit H, Mehretab H, Gebremedhin G (2014). Effects of Mineral Nitrogen and Phosphorus Fertilizers on Yield and Nutrient Utilization of Bread Wheat (Tritcum aestivum) on the Sandy Soils of Hawzen District, Northern Ethiopia. Agriculture, Forestry and Fisheries 3(3):189-198.

Chapman HD (1965). Cation exchange capacity by ammonium saturation. 891-901. In: Black CA, Ensminger LE, Clark FE (eds.), Method of soil analysis. American Society of Agronomy, Madison Wisconsin, USA.

Chesnin L, Yien CH (1951). Turbidimetric determination of available sulfates. Soil Science Society of America Journal 15: 149-151.
Crossref

Cook RJ, Veseth RJ (1991). Wheat health management. The American Phytopathological Society, USA. P 152.

Dagne C (2016). Blended Fertilizers Effects on Maize Yield and Yield Components of Western Oromia, Ethiopia. Agriculture, Forestry and Fisheries 5(5): 151-162.
Crossref

Esayas L (2015). Effect of Blended Fertilizers on Yield and Yield Traits of Durum Wheat (Triticum turgidum L. Var. durum) Varieties in Ada District, Central Ethiopia, MSc thesis, Haramaya University.

Ethiopian Soil Information System(EthioSIS) (2013). Soil analysis report. Agricultural Transformation Agency (Unpublished).

Food and Agriculture Organization of the United Nations (FAO) (2008). FAO Fertilizer and plant nutrition bulletin: Guide to laboratory establishment for plant nutrient analysis. FAO, Rome, Italy.

Food and Agriculture Organization of the United Nations (2014). FAOSTAT (Online). Available at: http://www.fao.org/faostat.

Hailu GM (1991). Wheat productions and research in Ethiopia. IAR, Addis Ababa.Available at: http://agris.fao.org/agris-search/search.do?recordID=ET9200001

Hailu H, Tekalign M, Riikka K, Erik K, Heluf G, Taye B (2015). Soil fertility status and wheat nutrient content in Vertisol cropping systems of central highlands of Ethiopia. Agriculture and Food Security 4(19):1-10.
Crossref

Horneck DA, Sullivan DM, Owen JS, Hart JM (2011). Soil test interpretation guide. (Corvallis, Or.): Oregon State University, Extension Service. Available: 

View

International Fertilizer Development Center (IFDC) (2015). Assessment of Fertilizer consumpti and use by Crop in Ethiopia. 

Jackson ML (1962). Soil chemical analysis. New Delhi, Prentice Hall of India Pvt. Ltd. P 498.

Landon JR (1991). Booker tropical soil manual: A handbook for soil survey and agricultural land evaluation in the tropics and sub-tropics. Longman Scientific and Technical, Essex, New York. pp. 474.

Liu Dandan, Yan Shi (2013). Effects of Different Nitrogen Fertilizer on Quality and Yield in Winter Wheat. Advanced Journal of Food Science and Technology 5(5):646-649.
Crossref

Mahammad MQ (2015). Effect of Different Nitrogen Fertilizers on Growth and Yield of Wheat. International Journal of Agriculture and Biology 27(5):19-28.

Malle J, Lea L, Ando A, Ann A (2017). Responses of wheat yield quality and bread-making properties on the sulfur fertilization. Acta Agriculturae Scandinavica, Section B Soil and Plant Science 67(5):444-452.

Mandic V, Krnjaja V, Tomic Z, Bijelic Z, Simic A, Ruzic Muslic D, Gogic M (2015). Nitrogen fertilizer influence on wheat yield and use efficiency under different environmental conditions. Chilean Journal of Agricultural Research 75(1):92-97.
Crossref

Melesse H (2017). Response of bread wheat (Triticum aestivum L.) varieties to N and P fertilizer rates in Ofla district, Southern Tigray, Ethiopia. African Journal of Agricultural Research 12(19):1646-1660.
Crossref

Mengistu B (2015). Growth, Yield, and Grain Quality of Durum Wheat (Triticum turgidum L. var. durum) Varieties as influenced by Nitrogen Application in Sinana, South-eastern Ethiopia. MSc thesis, Haramaya University.

Ministry of Agriculture (MoA) (2012). Ministry of Agriculture, Animal and Plant Health Regulatory Directorate. Crop variety register, Issue No. 15. Addis Ababa, Ethiopia.

Miyan MS, Impiglia A, Anderson WK (2011). Agronomic practices for durum wheat in an area new to the crop. Communications in Biometry and Crop Science 6(2):64-79.

Olsen SR, Cole CW, Watanabe FS, Dean LA (1954). Estimation of available phosphorous in soils by extraction with sodium bicarbonate. Journal of Soil Science 96:308-312.

Rahman MA, Sarker MAZ, Amin MF, Jahan AHS, Akhter MM (2011). Yield response and nitrogen use efficiency of wheat under different doses and split application of nitrogen fertilizer. Bangladesh Journal of Agricultural Research 36(2):231-240.
Crossref

Roy RN, Finck A, Blair GJ, Tandon HLS (2006). Plant nutrition for food security. A guide for integrated nutrient management. FAO Fertilizer and Plant Nutrition Bulletin 16:368.

Shah WA, Khan HU, Anwar S, Nawab K (2011). Yield and yield components of wheat as affected by different seed rates and nitrogen levels. Sarhad Journal of Agriculture 27(1):17-25.

Shazma AI, Babar I, Asad AK, ImranW AS, Mohammad I, Wajid AK, Ikramullah WA, Wasim A (2016). Nitrogen and phosphorus fertilization of improved varieties for enhancing phenological traits of wheat. Pure and Applied Biology 5(3):511-519.

Shewry PR (2009). The Health grain programme opens new opportunities for improving wheat for nutrition and health. Nutrition Bulletin 34(2):225-231.
Crossref

Tekalign T (1991). Soil, plant, water, fertilizer, animal manure and compost analysis. Working Document No. 13. International Livestock Research Center for Africa, Addis Ababa.

Tilahun C, Heluf G, Kibebew K, Tolessa D (2017). Effect of rate and time of nitrogen fertilizer application on durum wheat (Triticum turgidum Var L. durum) grown on Vertisols of Bale highlands, southeastern Ethiopia. American Journal of Research Communication 5(1):39-56.

Walkley AJ, Black IA (1934). Estimation of soil organic carbon by the chromic acid titration method. Journal of Soil Science 37:29-38.
Crossref

Yohannes E (2014). Effect of Rates and Time of Nitrogen Application on growth, Yield, and Grain Protein of Bread Wheat (Triticum aestivum L.) in Eastern Hararghe, Ethiopia. Msc Thesis, Hramaya University.