Effect of Rhizobium and Mycorrhizae Inoculation and Diammonium Phosphate (DAP) on Growth, and Yield of Soybean Glycin max (L). Merrill

Abstract

A field experiment was conducted for two consecutive summer and winter seasons (2010/11 and 2011/12), at Demonstration Farm of College of Agricultural Studies, Sudan University of Science and Technology at Shambat, to study the effect of rhizobium and mycorrhiza inoculation and diammonium phosphate (DAP) on growth, nodulation and yield of soybean Glycine max (L.) Merrill, (cultivar E01). The treatments consisted of control (C) (without any fertilizer and inoculation), inoculation with Bradyrihzobium alone (R), and combinations of inoculation with Bradyrihzobium + mycorrhiza (RM), Bradyrihzobium + mycorrhiza (VAM) + 100 kg /ha diammonium phosphate DAP (RMD1), and Bradyrihzobium + vesicular arbuscular mycorrhiza (VAM) + 150 kg /ha diammonium phosphate DAP (RMD2). A completely randomized block design with four replicates was used. The results showed that the combination of Bradyrihzobium and mycorrhiza (RM) significantly increased nodule number/plant and mycorrhizal infection%. Relative growth rate was significantly higher in (RMD1). Maximum plant height, branches number/plant, pods number/plant, 100 seed weight, protein% and grain yield were significantly affected by combination of Bradyrihzobium, mycorrhiza and 150 kg /ha DAP (RMD2). Winter seasons recorded higher relative growth, yield components and grain yield than summer seasons. It can be concluded that cultivar (E01) of irrigated soybean produced significantly higher growth and yield when combination of rhizobium with mycorrhiza and diammonium phosphate (DAP) was used during winter season under Khartoum conditions.