Productivity and Phosphorus Use Efficiencies of Soybean Genotypes on Fields of Differing Soil Fertility in Two Agroecological zones of Uganda

On- farm trials were conducted in the Northern moist farmlands (NMF) and South and Eastern Lake Kyoga basin (SELKB) agro-ecological zones of Uganda for two seasons of 2011 to determine the yield response of soybean genotypes to phosphorus and to identify genotypes that efficiently utilise P. The treatments include different P levels (0, 5, 10, and 20 kg ha- 1) with and without rhizobia. These were applied in four fields each of good, medium and poor fertility each season. Biomass yield and P enrichment of biomass at flowering, and grain yield and maturity were determined. Genotype grain yield responses were significantly (P<0.001) higher in the SELKB compared to NMF. Largest yield responses to P were from good fields in the NMF (28 to 229%) and medium fields in SELKB (7-113%). On the basis of the phosphorus efficiency ratios and biomass production, MAKSOY 1N and MNG 2:14 were identified as the most efficient P- utilising genotypes.
Les essais à la ferme ont été menés dans les terres agricoles humides du Nord (NMF) et dans les zones agro-écologiques de l’Ouganda au Sud et à l’Est du bassin du lac Kyoga (SELKB) pendant deux saisons de l’année 2011 afin de déterminer la réponsede rendement des génotypes de soja au phosphore et d’identifier des génotypes qui utilisent efficacement le Phosphore P. Les traitements comprennent des niveaux différents de P (0, 5, 10, et 20 kg ha- 1) avec et sans rhizobiums. Ceux-ci ont été appliqués dans quatre champs chacun d’une bonne, moyenne et faible fertilité à chaque saison. Le rendement en biomasse et l’enrichissement de P de la biomasse à la floraison, et la maturité et le rendement en grain ont été déterminés. Les réponses de rendement en grains des génotypesétaient significativement (P <0,001) élevées dans le SELKB par rapport aux NMF. Les plus grandes réponses de rendementauphosphore P provenaient de bons champs dans les NMF (28 à 229%) et de champs moyens dans le SELKB (7-113%). Sur la base des rapports d’efficacité du phosphore et de la production de biomasse, MAKSOY 1N et MNG 2:14 ont été identifiés comme étant les génotypes les plus efficaces utilisant le phosphore P.
Extended abstract under Enhancing Natural Resource Management
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East Africa
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The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholders in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants. This record contains an extended abstract accepted under the theme Extended abstract under Enhancing Natural Resource Management