Abad, J.R., Hassan, K., and Alamdarlou, E.H. (2014). Assessment the effects of land use changes on soil physicochemical properties in Jafarabad of Golestan province, Iran. Bulletin of Environment, Pharmacology and Life Sciences 3: 296-300.
Abreha, K., Heluf, G., Tekalign, M., and Kindie, T. (2012). Impact of altitude and land use type on some physicochemical properties of acidic soils in Tsegede highlands, Northern Ethiopia. Open Journal of Soil Science, 2: 223-233.
Achalu, C., Heluf, G., Kibebew, K., and Abi, T. (2012). Status of selected physicochemical properties of soils under different land use systems of Western Oromia, Ethiopia. Journal of Biodiversity and Environmental Sciences, 2(3): 57-71.
Afshar, F.A., Ayoubi, S., Jalalain, A. (2010). Soil redistribution rate and its relationship with soil organic carbon and total nitrogen using 137Cs technique in a cultivated complex hillslope in western Iran. Journal of Environmental Sciences, Radi.101, 606–614.
Alemayehu, K., Sheleme, B. (2013). Effects of different land use systems on selected soil properties in South Ethiopia. 4 (5), 100–107.
Barber, S.A., (1984). Liming material and practices. pp.173-205, In: Fred Adams(ed.).
Agronomy 12. ASA, SSSA, Madison, WI, USA.
Bovine, P., Schaffer, K., and Stuny, W. (2002). Quantifying the relationship between soil organic carbon and soil physical properties using shrinkage modeling. Eur Journal of Soil Science 60(4):265–275.
Chapman, H.D. (1965). Cation exchange capacity. In: Black, C.A., Ensminger, L.E., Clark, F.E. (eds.). Methods of soil analysis (pp. 891–901).
Chapman, H.D., David, J., Richard, C., Bishop, W., and Roger T. (2009). Natural resource damages associated with aesthetic and ecosystem injuries to Oklahoma’s Illinois River System and Tenkiller Lake.
CSA (Central Statistical Authority) (2007) Summary and statistical report of population and Housing census of Ethiopia. Central Statistical Agency, Addis Ababa
Dawit, S. Fritzsche, F., Tekalign, M. Lehmann. J. Zech, W. (2002). Phosphorus forms and dynamics as influenced by land use changes in the sub-humid Ethiopian highlands. Geoderma 105: 21-48.
Day, P.R. (1965). Particle size analysis. In: Black CA (ed.) Methods of soil analysis. Part 1: Physical and mineralogical methods, vol. 9.Am. Soc. Agro. Inc., Madison, WI. 545–
566 Duiker, S.W. and R.
Eylachew, Z. (2001). Study on physicochemical and mineralogical characteristics of some Vertisols of Ethiopia. pp. 87-102. Wondimagne Chekol and Engda Mersha (Eds.). In: Proceeding of the 5th Conference of the Ethiopian Society of Soil Science (ESSS), March 30-31, 2000. Addis Ababa, Ethiopia.
FAO (2006). Plant nutrition for food security: A guide for integrated nutrient management.
FAO, Fertilizer and Plant Nutrition Bulletin 16, Rome.
Fisseha, H., Heluf, G., Kibebew, K., Birru Y. (2014). Study of phosphorus adsorption and its relationship with soil properties analyzed with Langmuir and Freundlich models. Agriculture, Forestry and Fisheries. 3(1):40-51.
Foth, H.D. and Ellis, B.G. (1997). Soil fertility (2nd ed.). Lewis CRC Press LLC., USA. 290p.
Getahun, H., Mulugeta, L., Fisseha, I., Feyera, S. (2014). Impacts of land uses changes on soil fertility, carbon and nitrogen stock under smallholder farmers in central highlands of Ethiopia: Implication for sustainable agricultural landscape management around Butajira area. N. Y. Science Journal. 2014, 7(2).
Hao, X., Ball, B.C., Culley, J.L., and Parkin, G.W. (2008). Soil density and porosity. In: M.R.
Carter and E.G. Gregorich (Eds.) Soil Sampling and Methods of Analysis, Canadian society of soil science, Taylor and Francis Group, LLC., U.S.A. 743-760.
Landon, J.R. (1991). Tropical soil manual: A handbook for soil survey and agricultural land evaluation in the tropics and subtropics. Broker, Longman.
Liu, X.L. He, Y.Q., Schroder, J.K., Zhou, J., Zhang, Z.Y. (2010). Impact of land use and soil fertility on distributions of soil aggregate fractions and some nutrients. Pedosphere
20(5):666– 673.
Mohammed, A., Leroux, P.A., and Barker, L. (2005). Soil of Jelo micro-catchment in the central highlands of Eastern Ethiopia: Morphological and physiochemical properties. Ethiopian Journal of Natural Resource, 7, 55-81.
Murphy, H.F. (1968). A report on fertility status and other data on some soils of Ethiopia.
Collage of Agriculture HSIU. Experimental station bulletin No. 44, Collage of
Agriculture: 551p.
NMA (2019). Monthly Rainfall with Maximum and Minimum Temperature Data, Addis
Ababa, Ethiopia.
Nega, E. and Heluf, G. (2013). Effect of land use changes and soil depth on soil organic matter, total nitrogen and available phosphorus contents of soils in Senbat watershed, Western Ethiopia. Asian Research Publishing Network Journal of Agricultural and Biological science, 8(3): 206-212.
Nega, E. (2006). Land use changes and their effects on soil physicochemical properties in Senbat Sub-Watershed, Western Ethiopia. MSc Thesis, Alemaya University, Alemaya. 89p.
Okebalama, C.B., Igwe, C.A., Okolo, C.C. (2017). Soil organic carbon levels in soils of contrasting land uses in southeastern Nigeria. Tropical and Subtropical Agroecosystem 20:493-504.
Olsen, S.R., Cole, C.V., Watanable, F.S., and Dean, L.A. (1954). Estimation of available phosphorus in soil by extraction with sodium bicarbonate. USDA Circular. 939: 1-19.
Salako, F.K., Tian, G., Kirchhoff, G., Akinbola, G.E. (2006). Soil particles in agricultural landscapes of a derived savanna in southwestern Nigeria and implications for selected soil properties. Geoderma 137: 90–105.
Solomon, D., Fritzsche, F., Tekalign, M., Lehmann, J., and Zech, W. (2002). Soil organic matter dynamics in the sub-humid Ethiopian highlands: Evidence from natural 13C abundance and particle-size fractionation. Soil Sci. Soc. Amr. J. 66: 969-978.
Teshome, Y., Sheleme, B., Kibebew, K. (2016). Characterization and classification of soils of
Abobo area, Western Ethiopia. Applied and Environ. Soil Science. 1-16.
Teshome, Y., Heluf, G., Kibebew, K., Sheleme, B. (2013). Impacts of land use on selected physicochemical properties of soils of Abobo Area, Western Ethiopia. Agriculture, Forestry and Fisheries,2(5): 177-183.
Tilahun, A., Endrias, G., and Takele, B. (2007). Reversing the degradation of arable land in
Ethiopian highlands, Managing Africa's soil. No. 23, IIED-London.
Wakene, N. and Heluf, G. (2004). The impact of different land use systems on soil quality of western Ethiopia Alfisols. pp. 1-7. International research on food security: Natural resource management and rural poverty reduction through research for development and transformation. Deutcher Tropentage-Berlin 5-7 October 2004.
Walkley, A.and Black, C.A. (1934). An examination of the digestion method for determining soil organic matter and a proposed modification of the chromic acid titration method. Soil Science 37:29–38.
Yihenew, G. (2002). Selected physicochemical characteristics of soils Adet Research Center and its testing sites in North-Western Ethiopia. Ethiopian Journal of Natural Resources. 4(2): 199-215.
Yihenew, G. and Getachew, A. (2013). Effects of different land use systems on selected physicochemical properties of soils in Northwestern Ethiopia. Journal of Agric. Sci. 5 (4), 112–12.
Yitbarek, T., Gebrekidan, H., Kibret, K., Beyene, S. (2013). Impacts of land use on selected physicochemical properties of soils of Abobo Area, Western Ethiopia