Abstract
A field trial was conducted for two consecutive winter seasons (2010/11 and (2011/12), ), at Demonstration Farm of Collage of Agricultural Studies, Sudan University of Science and Technology at Shambat, to study the effect of rhizobium, mycorrhiza inoculation and diammonium phosphate (DAP) on growth, nodulation and yield of soybean Glycine max (L.) Merrill introduced genotype (E01). The treatments consisted of control (without any fertilizer and inoculation), inoculation with Bradyrihzobium alone, and combinations of inoculation with Bradyrihzobium + mycorrhiza (VAM), Bradyrihzobium + mycorrhiza (VAM) + 100 kg /ha diammonium phosphate (DAP), and Bradyrihzobium + vesicular arbuscular mycorrhiza (VAM) + 150 kg /ha diammonium phosphate (DAP). A completely randomized block design with four replicates was used. The results showed that the combination of Bradyrihzobium and mycorrhiza (VAM) produced significantly higher nodulation number/plant. Relative growth rate was significantly highest in combined of Bradyrihzobium, mycorrhiza (VAM) and 100 kg /ha (DAP). Maximum grain yield was significantly obtained at par with combinations of Bradyrihzobium, mycorrhiza (VAM) and 150 kg /ha (DAP) and Bradyrihzobium, mycorrhiza (VAM) and 100 kg /ha (DAP). In general the effect and interaction of rhizobium, mycorrhiza and diammonium phosphate rhizobium significantly increased nodulation number/plant, relative growth rate and yield of soybean over control. It can be concluded that genotype (E01) of irrigated soybean produced significantly highest growth and yield when combination of rhizobium with mycorrhiza and diammonium phosphate (DAP) was used during winter season under Khartoum conditions.
Highlights
The soybean crop is one of the most important crops worldwide
Lack of adaptable cultivar to the Sudan agro-ecological conditions has enormously contributed into the existing information gap on association of traits with seed yield Tony et al [3]
Shambat is Located 23°35, longitude 15°31’, and altitude 288m sea level, within the semi dry climate described by Adam [13] the soil of the site is loam clay it is characterized by a deep cracking, moderately alkaline clays, and low permeability, low nitrogen content and low P content,PH (7.5-8) content (50-60%) and high exchangeable sodium percentage (ESP), in subsoil
Summary
Soybean grains are important as protein meal and vegetable oil Hartman et al [1]. In the Sudan, soybean trials started as early as 1925 at Gezira Research Farm where a low yield was obtained. This low yield was attributed to lack of cultivars adaptable to the Sudan agro-ecological conditions. Lack of adaptable cultivar to the Sudan agro-ecological conditions has enormously contributed into the existing information gap on association of traits with seed yield Tony et al [3]. The country currently is importing vegetable oils for the local consumption, the introduction of new oil crop will cut these imports and help in the self sufficiency of such vital commodity
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