A study was done to see how adding certain helpful microbes to tomato plants affects their growth and yield. Different types of microbes were tested, and the ones called Azotobacter and Azospirillum were found to be the best. They made the plants taller, with more leaves, longer roots, and heavier fruits. Azotobacter was especially good at increasing the yield of tomatoes. So, if you want your tomato plants to grow better and produce more fruit, using Azotobacter and Azospirillum could be a good idea.