Deputy Director General | Oromia Agricultural Research Institute

Dr. Asefa Ta'a

I. ACADAMIC STUDIES AND QUALIFICATIONS

1. Doctorial studies in soil science From, Jan.1989-September.2001.Obtained a PhD degree in soil science from University of Free State. Republic of South Africa.

2. Master Level University studies in the field of Crop Management from Aug.1992 to Jan.1994. Obtained MSc. Degree in Crop Management from Agricultural University of Wageningen, the Netherlands.

3. Degree level University studies in the field of Agricultural from 1978 to 1982. obtained a BSc degree in plant science from Almaya College of Agriculture, Addis Ababa University ( Ethiopia)

4. Secondary level studies in Nekemte Comprehensive Secondary School Ethiopia) from 1973 to 1976. NB. The media of instruction for all studies was English.

II. PUBLICATION

1. Technical paper

 Asefa Taa, Douglas, G.Tanner, and A.T.P. Bennie, 2003 effect of stubble management, tillage and cropping sequence on soil chemical properties in the south-eastern highlands of Ethiopia. Proceeding of 6th ESSS conference,,Feb-28-March 1. 2002 Ethiopia Society of Soil Science.

 Asefa Taa, D.G Tanner,kefyalew Girma,Amanuel Gorfu and shamble Maru, 2000 Effect of tillage and cropping sequence practices on wheat production over eight years on a farmers’ field in the south-eastern highlands of Ethiopia,pp. 275-290. The 11th Regional Wheat workshop for Eastern Central and Southern Africa., Addis Ababa, Ethiopia: CIMMYT.

 Amanuel Gorfu, Kefyalew Girma, D.G Tanner, Asefa Taa, and shamble Maru.2000. Effect of crop rotation and fertilizer application on wheat yield performance across five years at two locations in south-eastern Ethiopia.pp. 264-274. The 11th Regional Wheat Workshop foe Eastern Central and Southern Africa. Addis Ababa, Ethiopia: CIMMYT.

 Kefyale Girma Amanuel Gorfu, D.G Tanner, shamble Maru and Asafa Taa, 1999.Weed population dynamics under different rotations in wheat-based cropping systems in the south-eastern Ethiopia highlands.pp.405-411. In: African Crop Science Conference Proceedings, vol. 4. Kampala.Uganda: African Crop Science Society.

 Asefa Taa, D.G.Tanner, Duga Dabele and Yesuf assen.1999.On Farm evaluation of fertilizer response of two recently released bread wheat verities in Ethiopia.pp.142-159. In: the 10th regional wheat workshop for eastern central and southern Africa.CIMMYT.Addis Ababa, Ethiopia.

 Taye Tesema, D.G.Tanner, Asefa Taa and Amsal Tarekegna, 1999.Screeming advance bread wheat lines for grain yield potential under grass weed infestation.pp. 325-334.In: the 10th regional wheat workshop for eastern, central and southern Africa, CIMMYT, Addis Ababa, Ethiopia.

 Tanner.D.G.Hugo Verkuji, Asefa Taa, and Ragassa Ensermu.1999 An agronomic and economic analysis of long-term wheat based crop rotation trial in Ethiopi.pp.213-248.In: the 10th regional wheat workshop for eastern, central and southern Africa. CIMMYT, Addis Ababa, Ethiopia.

 Tanner D.G. Asefa Taa and Kefyalew Girma, 1999.Determination of economic optimum fertilizer levels using discrete and continuous analysis methods, pp.273-297. In the 10th regional wheat workshop for eastern central and southern Africa. CIMMYT, Addis Ababa, Ethiopia.

 Asefa Taa and D.G Tanner.1998 Crop rotation and fertilizer effects on weed populations on South-eastern highlands of Ethiopia. pp. 88-103. In: Fasil Reda and G.D Tanner (Eds) Arem vol.4.EWSS Addis Ababa Ethiopia.

 Asefa Taa and G.D Tanner.1998 stubble management, tillage and cropping sequence effects on weed populations on south-eastern highlands of Ethiopia.pp.76-88. In: Fasil Reda and D.G Tanner (Eds) Arem.Vol.4 EWSS, Addis Ababa.

 Asefa Taa and D.G. Tanner.1998.On-farm evaluation of high efficacy grass herbicides for bread wheat production in Ethiopia.pp.101112. In: Kidane Georges and Yohannes and Degago (Eds) Crop Management option to sustain food security: Proceeding of the Third conference of agronomy and crop physiology society of Ethiopia. (ACPSE) Addis Ababa Ethiopia.

 Asefa Taa, D.G Tanner. 1998. Effect of stable management, tillage and precursor crops on soil penetration resistance in south-eastern Ethiopia.p.62-74.In: Kidane Georges and Yohannes Degago (Eds) Crop management option to sustain food security: Proceeding of the Third conference o Agronomy and crop physiology society of Ethiopia) ACPSE) Addis Ababa Ethiopia.

 Asefa Taa, and Mohammed Hassana.1997 Wheat management research and recommendations in Arsi region. Pp.40-45. In: Aberra Deressa and Beyene Seboka (eds). Research Achievements and Technology Transfer Attempts in south-eastern Ethiopia. Proceeding of the second technology generation, transfer and gap analysis workshop, Nazereth, Ethiopia.  Asefa Taa, D.G Tanner, Kefyalew Girma, Amanuel Gorfu and Gua Debele, 1996.Influence of stubble management tillage and precursor crops on soil physio-chemical properties in bread wheat in south-eastern Ethiopia.pp.104-111. In: Tanner, D.G.T.S Payne and O.S. Abdella, (Eds). The 9th Regional wheat workshop for Eastern Central and Southern Africa Addis Ababa, Ethiopia: CIMMYT.

 Asefa Taa, D.G Tanner, Kefyalew Girma and Amanuel Gorfu. 1996. Effect of stable management, tillage and precursor crop on yield and yield components of bread wheat in south eastern Ethiopia. Pp.177-186. In Tanner,D.G.T.S Payne and O.S Abdella, eds. The 9th Regional wheat workshop for Eastern Central and Southern Africa. Addis Ababa, Ethiopia: CIMMYT.

 Kefyalew Girma, Asefa Taa, Amanuel Gorfu, and D.G. Tanner. 1996. Effect of crop management practices on the population dynamics of different weed species in bread wheat I Arsi Region of Ethiopia.pp. 96-103. In: Tanner D.G T.S.Payne and O.S Abdella, (eds) . The Regional wheat workshop for Eastern Central and Southern Africa. Addis Ababa, Ethiopia: CIMMY.

 Melesse Temesgen, D.G.Tanner, Asefa Taa and Kefyalew Girma.1996 Development and evaluation of an animal-drawn implement for raw placement of seed and fertilizer for the establishment of a wheat crop.pp.168-174. In: Tanner, D.G. T.S. Payne and O.S Abdella,(eds). The 9th regional Wheat workshop for Eastern Central and Southern Africa. Addis Ababa Ethiopia: CIMMYT

 Amanuel Gorfu, D.G.Tanner, Kefyalew Girma, Asefa Taa and Duga Debele, 1996 Soil nitrate and compaction as affected by cropping sequence and fertilizer level. Pp.175-176. In Tanner. D.G. T.S Payne and O.S.(eds) The 9th Regional Wheat Workshop for Eastern Central and Central Southern Africa, Addis Ababa, Ethiopia:CIMMYT.

 Amanuel Gorfu, D.G.Tanner,Kefyalew Girma, Asefa Taa, and Duga Debele 1996 Soil nitrate and compaction as affected by cropping sequence and fertilizer level.pp.175-176. In: Tanner, D.G T.S Payne and O.S.Abdella,(eds) The 9th Regional Wheat Workshop for Eastern Central and Central Southern Africa, Addis Ababa, Ethiopia:CIMMYT.

 Amanuel Gorfu, D.G. Tanner, Kefyale Girma and Asefa Taa, 1996 the influence of crop rotation and fertilizer level on weed density in bread wheat in south-eastern Ethiopia.pp 71-76 In: Tanner, D.G T.s Payne and O.S Abdella (Eds). The 9th Regional Wheat Workshop for Eastern Central and Central Southern Africa, Addis Ababa, Ethiopia: CIMMYT.

 Asmare Yallew, D.G Tanner, Mohammed Hassena and Asefa Taa.1995 On-farm verification of five advance bread wheat lines under recommended and farmer’s crop management practices in the Ethiopia highlands.pp.159-171. In Yohannes Degago, Hailu Tefera,Getnet Gebeyehu, Abera Deressa, Asgellil Dibabe, Aduna Wakjira,Berekethehay Tuku and Efrem Bechere. Proceedings of 7th annual conference of crop Science Society of Ethiopia.

 Amanuel Gorfu, D.G Tanner, Asefa Taa, and Duga Debele. 1993 Observation on wheat and barely based cropping sequence trials conducted for eight years in south-eastern Ethiopia. In: D.G.(eds) Developing sustainable wheat production systems. The 8th Regional wheat workshop for Eastern, Central and Southern Africa, Kampala, Uganda.

 Asefa Taa, D.G Tanner and Amanuel Gorfu. 1992. The effect of tillage practices on bread wheat in three different cropping sequences in Ethiopia. In: Tanner D.G and Mwangi (Eds). The 7th Regional wheat workshop for Eastern central and southern Africa, Nakuru, Kenya.

 Tanner D.G Asefa Taa and Amanuel Gorfu. 1992 The effect of nitrogen and phosphorous fertilizers on several crops and soil parameters of small holder bread wheat in Ethiopia. In: Tanner D.G and Mwangi (Eds) the 7th Regional wheat workshop for Eastern Central and Southern Africa, Nakuru, Kenya.

 Amanuel Gorfu, D.G Tanner and Asefa Taa, 1992 On-farm evaluation of pre and post emergence grass herbicides on bread wheat in Arsi Region of Ethiopia. In Tanner.D.G and W.Mwangi (Eds). The 7th Regional wheat workshop for eastern Central and Southern Africa, Nakuru, Kenya.

 Amanuel Gorfu and Asefa Taa, 1992 the effect of pre-emergence application of Igran and variable seed rates on several parameters of bread wheat in Ethiopia. In: Tanner D.G and Mwangi (Eds). The 7th Regional wheat workshop for Eastern Central and Southern Africa Nakuru, Kenya.

 Amanuel Gorfu, D.G Tanner and Asefa Taa 1992 .An evaluation of two small scale implements for raw seeding and weeding of small holders bread wheat. In: Tanner D.G and W.Mwangi (Eds). The 7th Regional wheat workshop for Eastern, Central and Southern Africa, Nakuru, Kenya.

 Amanuel Gorfu and Asefa Taa, D.G. Tanner and W.Mwangi.1992 On-farm research to derive fertilizer recommendations for small scale bread wheat production: Methodological and technical results. Research report no.14: Institute of Agricultural research, Addis Ababa, Ethiopia.

 Amanuel Gorfu and Asefa Taa. 1991 on-farm evaluation of pre and post emergence herbicides in bread wheat. Paper presented to 9th Annual Conference of Ethiopia weed science Committee, Addis Ababa, Ethiopia.

 Asefa Taa, Amanuel Gurfu, Dereje Degene and Hailu Beyenee. 1992. On-farm bread wheat variety verification trial.Sebit Vol.4.  Amanuel Gorfu,Asefa Taa, D.G Tanner and Duga Debele 1990 The effect of crop rotation on wheat and barely field in Arsi Region sebil.Vol.3

 Amanuel Gorfu, D.G. Tanner.Lema Zewde and Asefa Taa. 1990 N and P up-take by wheat on farmer’s fields sebil Vol.3.

 Asefa Taa. 1988 The impact of cultural practices on the yield of barely: Paper presented at IAR/CIMMYT/CIAT workshop for planning Research project. Nazareth, Ethiopia.

 Asefa Taa, 1987 On-farm wheat varieties evaluation. Paper presented to agronomy training. Mexico D.F.CIMMYT.

 Asefa Taa, 1986 the impact of sowing date on yield and agronomic character of four varieties of barely. Paper submitted to SEDA publication, Asella, Ethiopia.

2. Journal articles in journals

Tilahun Chibsa & Asefa Taa. 2009. Assessment of soil organic matter under four land use systems in Bale highlands, southeast Ethiopia. A. Soil organic matter contents four land use systems: Forestland, Grassland, Fallow land and cultivated land. World applied science journal 6 (9): 1231-1246.

Tilahun Chibsa & Asefa Taa. 2009. Assessment of soil organic matter under four land use systems in Bale highlands, southeast Ethiopia. b. Factors affecting soil organic matter distribution. World applied science journal 6 (11): 1506-1512.

Asefa Taa, Douglas Tanner, Alan.T.P.Bennie 2005. Effect of stubble management, tillage, and cropping sequence on weed population dynamics in the south-eastern highlands of Ethiopia. Pest management Journal.14: 27-35

Asefa Taa, D, G, Tanner and A.T.P.Bennie. 2002. Effects of wheat straw on seedling growth, development and nutrient content. Ethiopian Journal of Natural Resources. 4: 1- 20.

Asefa Taa. D.G. Tanner and A.T. P. Bennie. 2002. Effect of stubble management, tillage and cropping sequence on the severity of take-all and eyespot diseases of wheat. African crop Science Journal. 10: 67-79.

Asefa Taa, D.G. Tanner and A.T.P. Bennie. 2001. Effects of stubble management, tillage and cropping sequence on wheat crop performance in Ethiopia: II. Changes in soil penetration resistance. Ethiopian Journal of Natural Resources. 3: 35-53.

Asefa Taa, D.G.Tanner, Kefyalew Girma and Amanual Gorfu. 1997. Grain yield of wheat as affected by cropping sequence and fertilizer application in south-eastern Ethiopia. African crop Science Journal. 5: 47-159.

Asefa Taa, D.G.Tanner, Kefyalew Girma and Amanual Gorfu. 1997. Grain yield of barley as affected by cropping sequence and fertilizer application in south-eastern Ethiopia. African crop science Journal. 5: 135-146.

Asefa Taa, D.G.Tanner, Melesse Temesgen and Kefyalew Girma. 1997. On-farm evaluation of an animal drawn implement developed in Ethiopia for row placement of wheat seed and basal fertilizer. African Crop Science J. 5: 359-369.

Belay Simane, D.G.Tanner, Amsal Tarekegne and Asefa Taa. 1999. Agro-ecological Decision support systems for wheat improvement in Ethiopia: climatic characterisation and clustering of wheat growing regions. African Crop Science J. 7: 9-19.

Tanner D.G., Amanuel Gorfu and Asefa Taa. 1993. Fertilizer effects on sustainability in the wheat based small-holder farming systems of south-eastern, Ethiopia. Journals of Field Crop Research 33, 235-248.

3. Books and other editions articles in books and proceedings.

Tanner D.G., Amanuel Gorfu, Lema Zewde and Asefa Taa. 1992. Developing technologies to improve soil fertility, weed control and wheat varieties. In: Steven Franzel and Helen Houten (Eds.). Research with farmers, lessons from Ethiopia. C.A.B. International Wallingford Oxon ox108DE U.K. .

Asefa Ta'a(PhD)
Deputy Director General
Email- taaasefa@gmail.com
Mobile +251911840466
Line phone +2519114707118