Success is often associated with a combination of inoculants possessing complementary beneficial traits e.g. biofertilizers that increase nutrient availability in the proximity of
the roots together with a mycorrhizal fungus that enhances the
root system and assists the plant to absorb the nutrients. It is not
surprising that often indigenous microbes prove the most effective;
such microbes suit the environmental conditions in the
cropping system for which they are intended. Nevertheless,
indigenous microbes would still have to out-compete other microbes
for resources and, in the case of biocontrol agent, suppress
pathogens.