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