Metagenomics can help to have insight into 99% of the still uncultured bacteria, what sort of applications can be from this knowledge of bacterial diversity from soil, other than this are their other benefits of these sequences?
From the compositional analysis we can gain insights into the microbial diversity and proportion of the specific bugs that are present in that specific ecosystem.
By applying functional metagenomics at the gene level we can trace out the functional capabilities of the specific bugs. We can imply those functionalities into other non-pathogenic bugs by cloning and make good use of those recombinant bugs for various purposes. For eg. Bioremediation (Pesticide degradation), Nitrogen fixation and many more. For other beneficial purposes, antibiotic and metabolites production etc
You can study the functional aspect of the bacterias that are there in soil. You should do whole genome of get to know what all genes that you soil sample is enriched with. If you do 16S rRNA then you can get broader overview in terms of bacteria taxonomy in the sample.