Intercropping tomato with potato and onion can help plants grow better and improve the soil. The researchers found that intercropping increased tomato seedling size and changed the types of bacteria and fungi in the soil. Some helpful bacteria like Bacillus and Pseudomonas increased, while harmful fungi like Cladosporium decreased. The soil's carbon and pH levels affected the bacteria, while carbon and phosphorus levels affected the fungi. Overall, intercropping with potato and onion can make the soil healthier and help tomatoes grow better.