Abstract
ABSTRACT: High yields obtained from soybean [Glycine max (L.) Merrill], and consequent profits, are related to efficient symbiosis of soybean with nitrogen fixing bacteria of the Bradyrhizobium genus. Inoculation with strains belonging to the Bradyrhizobium japonicum, B. elkanii, and B. diazofficiens species, approved by the Brazilian Ministry of Agriculture (MAPA), is a common practice for this crop. However, variations in the composition of inoculants can change the quality of the product. The aim of this study was to genetically identify [...]
Highlights
Brazil is one of the world’s largest soybean [Glycine max (L.) Merril] producers, with production of 102.4 million tons and yield of 3 tons per ha in the 2016/17 harvest (Conab, 2016)
Inoculants commercialized in Brazil for soybean crops are formulated with strains of the species Bradyrhizobium japonicum (SEMIA 5079/CPAC 15), B. elkanii (SEMIA 587 and SEMIA 5019/ BR 29), and B. diazofficiens (SEMIA 5080/ CPAC 7)
Commercial inoculants formulated with Bradyrhizobium were able to present rhizobia strains with morphological and symbiotic characteristics distinct from the strains indicated in the product
Summary
Brazil is one of the world’s largest soybean [Glycine max (L.) Merril] producers, with production of 102.4 million tons and yield of 3 tons per ha in the 2016/17 harvest (Conab, 2016). The agricultural potential of inoculants may be affected by factors such as high application rates of nitrogen fertilization in the soil, inadequate inoculation of the seeds, and use of low quality commercial inoculants. Inoculants commercialized in Brazil for soybean crops are formulated with strains of the species Bradyrhizobium japonicum (SEMIA 5079/CPAC 15), B. elkanii (SEMIA 587 and SEMIA 5019/ BR 29), and B. diazofficiens (SEMIA 5080/ CPAC 7). These inoculant strains completely meet the nitrogen demand of the soybean crop (Franco, 2009). The whole inoculation process may be compromised if inoculant products do not meet quality control standards. Establishing parameters that define the quality of inoculants is paramount for product standardization (Castroux et al, 2001; Herridge et al, 2002; Brasil, 2011)
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