The article discusses how different organisms in soil can indicate its health. Soil microflora, plant root pathogens, microfauna, and arthropods can show if soil is healthy. Enzyme activities, microbial biomass, and nutrients can also give clues about soil health. Biodiversity of soil organisms is important for healthy soil. Plants can be used to monitor soil health. Genetically modified biosensors can detect soil contamination. Overall, using bioindicators can help monitor soil health and productivity sustainably.