Lal, R. (2007) Anthropogenic influences on world soils and implications to global food security. Advances in Agronomy, 93, 69-93.
 Yassen, A.A., Khaled, S.M. and Sahar, M.Z. (2010) Response of wheat to different rates and ratios of organic residues on yield and chemical composition under two types of soil. Journal of American Science, 6, 858-864.
 Franzluebbers, A.J. and Stuedemann, J.A. (2008) Early response of soil organic fractions to tillage and integrated crop-livestock production. Soil Science Society of America Journal, 72, 613-625. doi:10.2136/sssaj2007.0121
 Fliessbach, A., Roland, H., Daneil, R., Robert, F. and Frank, E. (2000) Soil organic matter quality and soil aggregates stability in organic and conventional soil.
 Dalal, R.C. and Mayer, R.S. (1986) Longterm trends in fertility of soils under continuous cultivation and cereal cropping in South Western Queensland, I overall changes in soil properties and trends in winter cereal yields. Australian Journal of Soil Research, 24, 265-279.
 Enke, Li., Changrong, Y., Xu-rong, M., Wenqing, H., Bing, S.H., Linping, D., Qin, L., Shuang, L. and Tinglu, F. (2010) Long term effect of chemical fertilizer, straw, and manure on soil chemical and biological properties in northwest China. Geoderma, 158, 173-180.
 Franzleubbers, A.J. (2002) Soil Organic manure stratification ratio as an indicator of soil quality. Soil & Tillage Research, 66, 95-106.
 Phocaides, A. (2000) Technical hand book on pressurized irrigation techniques, food and agriculture organization of the United Nations. Rome.
 Abd El-Kader, A.A., Shaaban, S.M. and Abd El-Fattah, M.S. (2010) Effect of irrigation levels and organic compost on okra plants (Abelmoschus esculentus L.) grown in sandy calcareous soil. Agriculture and Biology Journal of North America, 1, 225-231.
 Rebecca, B. (2004) Soil survey laboratory methods manual. Soil Syrvey Investigations Report No. 42, Natural Resources Conservation Services.
 Klute, A. (1986) Water retention: Laboratory methods. In: Klute, A., Ed., Methods of Soil Analysis, Part 1, Physical and Mineralogical Methods, ASA and SSSA, Madison, 635-662.
 Klute, A. and Dirksen, A. (1986) Hydraulic conductivity. In: Klute, A., Ed., Methods of Soil Analysis, Part 1, Physical and Mineralogical Methods, ASA and SSSA, Madison, 678-734.
 Faithfull, N.T. (2002) Methods in agricultural chemical analysis. A practical handbook. CABI Publishing, Wallingford, 84-95. doi:10.1079/9780851996080.0000
 Yemm, E.W. and Willis, A.J. (1954) The estimation of carbohydrates in plant extracts by anthrone. Biochemistry, 57, 508-514.
 Allen R.G., Pereira, L.S., Raes, D. and Smith, M. (1998) Crop evapotrans-piration—Guidelines for computing crop water requirements—FAO irrigation and drainage paper 56. FAO—Food and Agriculture Organization of the United Nations, Rome.
 Israelsen, O.W. and Hansen, V.E. (1962) Flow of water into and through soils. Irrigation principles and practices. 3rd Edition, John Willey and Sons, Inc., New York.
 Michael, A.M. (1978) Irrigation theory and practice. Vikas Publishing House, New Delhi.
 SAS Institute (2001) SAS statistics users’ guide. Release 8.2. SAS Institute, Cary.
 Dalal, R.C. (1982) Organic matter content in relation to the period of cultivation and crop yields in some subtropical soils. 12th International Soil Science Congress, 6, 59.
 Saeed, A.B. and Eissa, H.Y. (2002) Influence of tillage on some properties of heavy cracking clay soils and sorghum yield in the mechanized rainfed agriculture. The Journal of Agricultural Science, 10, 267-276.
 Schumacher, T.E., Lindstrom, M.J.L., Eynard, A. and Malo, D.D. (2000) Tillage system effects on soil structure in the Upper Missouri river basin. Proceedings of the 15th Conference of ISTRO, Fort Worth, Dallas, 2-7 July 2000.
 Kladivko, E.J. (2001) Tillage systems and soil ecology. Soil & Tillage Research, 61, 61-76.
 Mubarak, A.R. and Rosenani, A.B. (2003) Soil organic manure fractions in the humid tropics as influenced by application of crop residues. Communications in Soil Science and Plant Analysis, 34, 933-943.
 Randall, G.W. and Iragavarapa, T.K. (1995) Impact of longterm tillage systems for continuous corn on nitrate leaching to tile drainage. Journal of Environmental Quality, 24, 360-366.
 Kay, B.D. and Vanden Bygaart, A.J. (2002) Conservation tillage and depth stratification of porosity and soil organic matter. Soil & Tillage Research, 66, 107-118.
 Tawfik, M.M. and Gomaa, A.M. (2005) Effect of organic and biofertilizer on growth and yield of wheat plants. Journal of Agricultural and Resource Economics, 2, 711-725.
 Hellal, F.A., Abd El-Hady, M. and Ragab, A.A.M. (2009) Influence of organic amendments on nutrient availability and uptake by faba bean plants fertilizered by rock phosphate and feldspar. American-Eurasian Journal of Agricultural & Environmental Sciences, 6, 271-279.
 EL-Gindy, A.M. and Abdel-Aziz, A.A. (2003) Maximizing water use efficiency of maize crop in sandy soils. Annals of Agricultural Sciences, 11, 439-452.
 Abbas, G., Hussain, A., Ahmad, A. and Wajid, S.A. (2005) Water use efficiency of maize as affected by irrigation schedules and nitrogen rates. Journal of Agriculture and Social Sciences, 1, 339-342.