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kasetsart journal natural science

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82<br />

of chromic acid titration method. Soil Sci. 153:<br />

100-107.<br />

Wassie, H., T. Mala, Y. Osotsapar and V. Verasan.<br />

2004. Investigation on the nitrification<br />

potential of some soils occurring in sothern<br />

and central Ethiopia. Kamphaengsean Acad.<br />

J. 2: 111-125<br />

Woldemichael, K. 1987. A glossary of Ethiopian<br />

Plant Names. 4 th ed. Addis Ababa 245 p.<br />

Kasetsart J. (Nat. Sci.) 40(1)<br />

Yesuf, A., O. Vancleemput. 2000. The effect of<br />

urease inhibitors and their mixture on the<br />

mineral N content of sandy loam soil after urea<br />

application, pp. 23-34. In W. Chekol and E.<br />

Mersha (eds.). Nutrient management for<br />

improved soil/crop productivity in Ethiopian<br />

agriculture. Proceedings of the 5 th coference<br />

of ESSS, Addis Ababa.

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