Effect of cultivation on physical and chemical properties of a Vertisol in middle Awash Valley, Ethiopia

References

• Campbell , C.A. and Souster , W. 1982 . Loss of organic matter and potentially mineralizable nitrogen from Saskatchewan soils due to cropping . Canadian J. Soil Sci. , 62 : 651 – 656 .
   Web of Science ®Google Scholar
• Chan , K.Y. 1982 . Shrinkage characteristics of soil clods from a gray clay under intensive cultivation . Australian. J. Soil Res. , 20 : 65 – 68 .
   Web of Science ®Google Scholar
• Chan , K.Y. , Bellotti , W.D. and Roberts , W.P. 1988 . Changes in surface soil properties of Vertisols under dryland cropping in a semi‐arid environment . Australian J. Soil Res. , 26 : 509 – 518 .
   Web of Science ®Google Scholar
• Dalai , R.C. and Mayer , R.J. 1986 . Long‐term trends in fertility of soils under continuous cultivation and cereal cropping in Southern Queensland. I. Overall changes in soil properties and trends in winter cereal yields . Australian J. Soil Res. , 24 : 265 – 279 .
   Web of Science ®Google Scholar
• Daniells , I.G. 1989 . Degradation and restoration of soil structure in a cracking grey clay used for cotton production . Australian J. Soil Res. , 27 : 455 – 469 .
   Web of Science ®Google Scholar
• Derdour , H. and Angers , D.A. 1992 . Influence of salinity and other constituents on the mechanical behavior of clay soils . Soil Tech. , 5 : 39 – 46 .
   Google Scholar
• Greenland , D.J. 1977 . Soil damage by intensive arable cultivation: Temporary or permanent? . Phil. Trans. R. Soc. London B , 281 : 193 – 208 .
   Web of Science ®Google Scholar
• Grismer , M.E. 1992 . Cracks in irrigated clay soil may allow some drainage . California Agric. , 46 (5) : 9 – 11 .
   Google Scholar
• Lewis , J. and Freitas , F. , eds. 1984 . Physical and Chemical Methods of Soil and Water Analysis , FAO Soils Bull. No. 10 Rome , , Italy : Food and Agriculture Organization .
   Google Scholar
• McGarry , D. and Chan , K.Y. 1984 . A preliminary investigation of clay soils behavior under furrow irrigated cotton . Australian J. Soil Res. , 22 : 99 – 108 .
   Web of Science ®Google Scholar
• Richards , L.A. , ed. 1954 . Diagnosis and improvement of saline and alkali soils , Washington , DC : U.S. Government Printing Office . USDA Handbook No. 60
   Google Scholar
• Soil Survey Staff . 1975 . Soil Taxonomy: A basic system of soil classification for interpreting soil surveys , Washington , DC : U.S. Government Printing Office . USDA Handbook 436
   Google Scholar
• Witschi , P.A. and Michalk , D.L. 1979 . The effect of sheep treading and grazing on pasture and soil characteristics of irrigated annual pastures . Australian Agric. Res. , 30 : 741 – 745 .
   Google Scholar