Abstract
Inoculating soybean seeds with superior rhizobia strains is necessary for nodulation and nitrogen fixation. Ironically, many commercial agricultural products (biological and chemical) claim increases in crop productivity but their efficacy cannot be guaranteed. Thus, the trial was conducted for two consecutive years during rainy seasons of 2014 and 2015 in order to determine the effectiveness of some commercial microbial inoculants and recommend the best thizobia that increase the soybean grain yield in study area (Dangur) district. The experiment consists of six strain bacteria, one inorganic fertilizer alone and negative control, totally eight treatments viz., SB-14, SB-6B1, SB-6A2, SB-Murdock, SB-12, MAR-1495, recommended rate of fertilizer (100/ha TSP) , and control treatment. The experiment was replicated three times in randomized complete block design. The results revealed that co-inoculation of SB-Murdock with the soybean variety Belesa 95, produced significantly higher grain yield per hectare (1792.05kg), nodule numbers per plant (105.7), nodules dry weight per plant (0.51g), pod numbers per plant (36.57), seed numbers per plant (95.07) than the negative control treatment. On the other hand, the lowest grain yield (1099.16kg/ha), plant biomass (3055.56kg/ha), nodule numbers per plant (4.73), nodule dry weights per plant (0.04g), pod numbers per plant (23.87) and seed numbers per plant (55.3) were obtained from negative control treatment. The overall results thus suggest that rhizobial strains SB-Murdock can be used for producing higher yield of soybean when compared with the rest strain under agro climatic conditions of Dangur district. Keywords: nitrogen fixaxion, Glycine max, nodules, inoculation. DOI: 10.7176/JBAH/10-16-01 Publication date: August 31 st 2020
Highlights
Soybean is one of legume crops produced mostly in werstern Ethiopia mainly in Oromia, Benishangul Gumuz and Seldom in Amhara regional state
With the expectation of an increase in the amount of N used in agriculture due to increasing population and food demand, excess application of chemical nitrogen fertilizer and its negative impact on the environment can be reduced through biological nitrogen fixation (BNF) (Gupta et al 2007)
A rhizobia inoculant helps to boosts the natural population of beneficial nitrogen-fixing bacteria to form effective nodules that are responsible for effective biological nitrogen fixation and explains the over 100% increase in grain yield compared to the control (Chen 2008)
Summary
Soybean is one of legume crops produced mostly in werstern Ethiopia mainly in Oromia, Benishangul Gumuz and Seldom in Amhara regional state. It has various contributions in different area and its cultivation increase from time to time. According to Qureshi et al, (2009), rhizobium legume inoculation has been practiced in agricultural systems for more than a century. Such inoculants can be termed as bio-fertilizers (Mulongoy et al, 1992). Bio-fertilizers are valuable to the environment as they enable reduced use of chemical fertilizers in the production of crops in different parts of the world. Www.iiste.org the best effective soybean strain bacteria for the purpose of increasing soybean grain yield
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