Response of soybean (Glycine max (L.) Merrill) to bradyrhizobia inoculation and phosphorus application
2004
Kumaga, F.K. (University of Ghana (Legon). Dept. of Crop Science) | Ofori, K.
For many tropical countries, particularly in Africa, biological nitrogen (N) fixation continues to be an alternative supplement to the use of chemical N fertilizers for sustainable agriculture. Two field experiments were established determine the effectiveness of introduced bradyrhizobia on nodulation, growth and yield of a promiscuous and a no promiscuous soybean variety under varying levels of phosphate fertilizer (0, 30 and 60 kg ha-1). Bradyrhizobia inoculation significant (p less than 0.01) effects on nodulation, dry matter, total N and seed yield of both varieties, being more pronounced in the case of the promiscuous variety than the non-promiscuous variety. Under natural conditions, increased application phosphorus had quite prominent effects on nodulation and other growth and yield parameters of `Bengbie' (promiscuous variety) but it was almost the reverse in the case of the other variety, `Bragg' (non-promiscuous), where only seed yield was increased. P application at low dose (30 kg ha-1) coupled with inoculation with bradyrhizobia significantly favoured all parameters studied, in the two varieties. Application of high P (60 kg ha-1) under inoculated conditions proved beneficial on' in the case of `Bragg' and not `Bengbie'. Inoculation of promiscuous soybean with effective bradyrhizobia may prove to be better strategy for increasing soybean yields than addition of P fertilizer in West African soils.
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