Spraying Inoculants (IMAGE) American Society of Agronomy Caption Inoculating--adding helpful bacteria to soybean seeds-usually occurs at sowing time. However, in this study, soybean crops at various stages of growth were also inoculated by spraying the plants with bacteria. Credit Luiz G. Moretti. Usage Restrictions Please use with story only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.