Prof. Johnson Semoka – Department of Soil and Geological Sciences

Prof. Johnson Semoka

July 1984 – July 2016: Sokoine University of Agriculture (SUA)

Department of Soil and Geological Sciences
Morogoro, Tanzania

Position : Professor

Description

I teach Soil Fertility and Fertilizer Use and Plant Nutrition at undergraduate level and Integrated Soil Fertility Management and Advanced Plant Nutrition at postgraduate level

September 1977 – June 1980 : University of California, Riverside

Field of study:- Soil Science

PUBLICATIONS

Soil fertility survey in western Usambara Mountains, northern Tanzania PA Ndakidemi, JMR Semoka Pedosphere 16 (2), 237-244	69	2006
Maize yield response and nutrient uptake after micronutrient application on a volcanic soil JB Lisuma, JMR Semoka, E Semu Agronomy journal 98 (2), 402-406	38	2006
Hard Minjingu phosphate rock: an alternative P source for maize production on acid soils in Tanzania MM Msolla, JMR Semoka, OK Borggaard Nutrient Cycling in Agroecosystems 72 (3), 299-308	30	2005
Extrapolating effects of conservation tillage on yield, soil moisture and dry spell mitigation using simulation modelling ZJ Mkoga, SD Tumbo, N Kihupi, J Semoka Physics and Chemistry of the Earth, Parts A/B/C 35 (13-14), 686-698	29	2010
Can local Minjingu phosphate rock replace superphosphate on acid soils in Tanzania? C Szilas, JMR Semoka, OK Borggaard Nutrient Cycling in Agroecosystems 77 (3), 257-268	28	2007
Effectiveness of Minjingu phosphate rock as a source of phosphorus for maize in some soils of Morogoro, Tanzania PNS Mnkeni, JMR Semoka, J Buganga The Zimbabwe Journal of Agricultural Research (Zimbabwe)	28	1991
Pedological characterization of some typical soils of Busia County, Western Kenya: Soil morphology, physico-chemical properties, classification and fertility trends SJ Kebeney, BM Msanya, WK Ng’etich, JM Semoka, CK Serrem International Journal of Plant & Soil Science	21	2014
Soil test calibration studies for formulation of phosphorus fertilizer recommendations for maize in Morogoro district, Tanzania. I. evaluation of soil test methods DA Ussiri, PNS Mnkeni, AF MacKenzie, JMR Semoka Communications in soil science and plant analysis 29 (17-18), 2801-2813	19	1998
Effectiveness of Tanzanian phosphate rocks of igneous and sedimentary origin as sources of phosphorus for maize JMR Semoka, PNS Mnkeni, HD Ringo Zimbabwe Journal of Agricultural Research 30 (2), 127-136	19	1992
Wheat response to applied nitrogen, sulfur, and phosphorous in three representative areas of the central highlands of Ethiopia–I A Menna, JMR Semoka, N Amuri, T Mamo IJPSS 8 (5), 1-11	16	2015
Introductory soil science AP Uriyo, HO Mongi, MS Chowdhury, BR Sing, JMR Semoka TPH Ltd., Dares Salaam	16	1979
Establishment of an agronomic database for Minjingu phosphate rock and examples of its potential use C Szilas, JMR Semoka, OK Borggaard Nutrient Cycling in Agroecosystems 78 (3), 225-237	15	2007
Mineralogy of characteristic well-drained soils of sub-humid to humid Tanzania C Szilas, J Peter Møberg, OK Borggaard, JMR Semoka Acta Agriculturae Scandinavica Section B-Soil and Plant Science 55 (4), 241-251	15	2005
Agrogeology in East Africa: the Tanzania-Canada project W Chesworth, P Van Straaten, JMR Semoka Journal of African Earth Sciences (and the Middle East) 9 (2), 357-362	15	1989
Participatory assessment of soil degradation in the uplands of southwestern Tanzania: implications for sustainable agriculture and rural livelihoods ZJU Malley, JMR Semoka, JA Kamasho, CV Kabungo The International Journal of Sustainable Development and World Ecology 13 (3 …	14	2006
Genotypic variation for tolerance to low soil phosphorous in common bean under controlled screen house conditions A Namayanja, J Semoka, R Buruchara, S Nchimbi, M Waswa Agricultural sciences 2014	12	2014
Limestone, Minjingu phosphate rock and green manure application on improvement of acid soils in Rwanda NL Nabahungu, JMR Semoka, C Zaongo Advances in Integrated Soil Fertility Management in sub-Saharan Africa …	12	2007
Pedological characterization of some typical alluvial soils of Kilombero District, Tanzania AM Kalala, BM Msanya, NA Amuri, JM Semoka American Journal of Agriculture and Forestry	11	2017
Effects of Mapogoro phillipsite on availability of phosphorus in phosphate rocks PNS Mnkeni, JMR Semoka, EG Kaitaba TROPICAL AGRICULTURE-LONDON THEN TRINIDAD- 71, 249-249	11	1994
Crop (Maize) response to direct application of local phosphate rock on selected acid soils of Tanzania MM Msolla, JMR Semoka, C Szilas, OK Borggaard Communications in soil science and plant analysis 38 (1-2), 93-106