Exposure of Soybean Seeds With Bradyrhizobium Biotechnology to High Temperatures in the Seeder Hopper: Effects on Fbn Attributes and Yield
Year: 2026
Type: article
Abstract: Biological nitrogen fixation (BNF) is an effective alternative for reducing production costs and environmental damage in soybean systems.BNF depends on correct inoculation practices (CIP), since the bacterium Bradyrhizobium is sensitive to conditions such as temperature.In some cases, soybean farmers inoculate the seed and expose the inoculated seed to solar radiation, which exposes the bacteria to higher temperatures and, consequently, reduces the number of viable microbial cells; thus, the practice does not reach maximum results.The objective of this study was to evaluate the nodulation and production of soybean inoculated with Bradyrhizobium japonicum under different times of exposure to solar radiation (temperature).The experiment was conducted in a commercial soybean production area, and the sampling process was defined according to a stratification plan.Six treatments were established: non-inoculated seeds (No Ino); inoculation in the shade and sowing after 30 minutes (INOT0); sowing after two hours of inoculation (INOT2); sowing after four hours of inoculation (INOT4); sowing after six hours of inoculation (INOT6); and sowing after eight hours of inoculation (INOT8).Fresh nodule mass (MFN), dry nodule mass (MSN) and yield were evaluated.There was a decrease in soybean yield over the exposure time of the inoculated seed left exposed to solar radiation.Yield losses became evident from approximately 2 hours of exposure onward, reaching approximately 530 kg ha⁻¹ (about 8.8 sacks ha⁻¹) when comparing the earliest (INOT0) and latest (INOT8) sowing times.From the MFN and MSN results, such reductions may be associated with a decrease in nodule mass at the grain filling stage.Thus, the farmer needs to invest in correct inoculation practices, performing the operation as close as possible to sowing, in order to avoid exposure to radiation and excessive temperature of the inoculant, maintaining the viability of the bacterial cells and benefiting soybean grain yield.
Source: Journal of Engineering Research
Institution: Centro Universitário Filadélfia
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W7220904698