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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Yield and economic benefits of common bean (Phaseolus vulgaris) and soybean (Glycine max) inoculation in northern Tanzania
Australian Journal of Experimental Agriculture, Volume 46, No. 4, Year 2006
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Description
On-farm experiments were conducted in farmers' fields at 12 different sites in the 2 districts of Moshi and Rombo in northern Tanzania during the 2000-01 cropping season to study the effects of (brady)rhizobial inoculation in combination with P supply on growth and grain yields of soybean and common bean, and to assess the economic returns of these different technologies to farmers. A low level of N was included as an indicator of endogenous soil N status. The treatments included (brady)rhizobial inoculation, N fertilisation (30 kg N/ha as urea), P application [26 kg P/ha as triple super phosphate (TSP)], (brady)rhizobial inoculation + P fertilisation (26 kg/ha as TSP) and unfertilised uninoculated control. The study was conducted as a randomised complete block design with each of the 12 farmers' fields as a replicate. At harvest, plant growth of soybean and common bean was significantly (P≤0.05) greater with (brady)rhizobial inoculation compared with N and P supply or uninoculated control in the 2 districts. Relative to uninoculated unfertilised plots, grain yields of common bean were markedly (P≤0.05) increased by 60-78% from inoculation alone, and 82-95% from inoculation + 26 kg P/ha; with soybean there was 127-139% increase in grain yield from inoculation alone, and 207-231% from inoculation + P. Thus, the combined application of bacterial inoculants and P fertiliser to field plants of soybean and common bean significantly (P≤0.05) increased biomass production and grain yield compared with the single use of N and P or (brady)rhizobial strains. From economic analysis, the increase in grain yield with inoculation translated into a significantly (P≤0.05) higher marginal rate of return and dollar profit for soybean and common bean farmers in northern Tanzania. With common bean, there was a 66 and 92% increase, respectively, in dollar profit with inoculation at Moshi and Rombo districts respectively relative to control; these profit margins rose to 84 and 102% with provision of supplemental P (26 kg P/ha). With soybean, however, the increase in profit with inoculation was much larger, about 140 and 153% at Rombo and Moshi, respectively, and these rose to 224 and 250% with P supply. © CSIRO 2006.
Authors & Co-Authors
Ndakidemi, Patrick Alois
South Africa, Bellville
Cape Peninsula University of Technology
Tanzania, Arusha
Selian Agricultural Research Institute
Dakora, Felix Dapare
South Africa, Bellville
Cape Peninsula University of Technology
Nkonya, Ephraim M.
Uganda, Kampala
International Food Policy Research Institute
Ringo, D.
Tanzania, Arusha
Selian Agricultural Research Institute
Mansoor, Hussein
Tanzania, Arusha
Selian Agricultural Research Institute
Statistics
Citations: 125
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1071/EA03157
ISSN:
08161089
Study Locations
Tanzania