Abstract
Inoculation with nitrogen-fixing bacteria ( Bradyrhizobium ) is an indispensable technology to increase the productivity of the soybean crop. The objective of this study was to evaluate the viability of the inoculation with Bradyrizobium bacteria associated with the osmoprotector coating on different pre-sowing days and the effect of different soil pH on the components of yield, nodulation and grain yield of soybean. Two soybean cultivars were used, sown in two seasons and submitted to soil pH of 5.3 and 6.5. The seeds were inoculated at different pre-sowin periods with Bradyrizobium bacteria in the presence or absence of osmoprotectants. In the cultivar NA 5909RG (pH 5.3), the seeds inoculated with Bradyrhizobium and osmoprotector, at four and seven days of pre-sowing, presented an increase of 10.8% and 8.3% of productivity, in relation to those without osmoprotector. The osmoprotector and the inoculation of Bradyrhizobium increases the number and dry mass of nodules in soil with more acidic pH. The soil of lower acidity is responsible for higher grain yield, compared to the higher acidity, when both were not inoculated. The variable with the greatest explanatory power and contribution in the variability in the data of the experiment is the grain yield.
Highlights
The expression of the productive potential of the soybean crop (Glycine max (L.) Merrill) depends on the conditions of the environment where the plants develop and on the correct management of fertilization
The need can be met by the biological nitrogen fixation process (BNF) where bacteria of the Bradyrhizobium gender associate with the root system of the soybean plant, establishing a symbiosis, resulting in the formation of nodules (Zilli, Campo, & Hungria, 2010)
When there was no significant interaction, the averages between the levels of each factor were compared. In both cultivars and soil pH, in the first sowing season, it was observed that the roots of the plants that contained nodules with smaller sizes (DMN and NN) were the ones that presented a significant difference between the treatments
Summary
The expression of the productive potential of the soybean crop (Glycine max (L.) Merrill) depends on the conditions of the environment where the plants develop and on the correct management of fertilization. The soil acidity promotes a reduction in its development, especially the presence of manganese, iron and aluminum, which are toxic to most crops of economic interest (Souza, Novais, Alvarez, Hugo, & Villani, 2010). It acts negatively on the activities of the microsymbiont (rhizobia), which is the most sensitive part to the pH effect (Albareda, Rodríguez-Navarro, & Temprano, 2009), making it difficult to exchange signals between them and plant roots (Rufini et al, 2011), limiting its survival and multiplication, resulting in reduced nodulation (España, Cabrera-Bisbal, & López, 2006)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
