Prof. Johnson Semoka

Prof. Johnson Semoka

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