Many bacteria contribute to soil fertility, and fungi too. Biological soil crusts occur in many places on the surface of infertile soil, including sandy areas like deserts. They stabilise the soil and also enhance it's fertility, for example cyanobacteria in soil crusts can fix carbon into the soil by photosynthesis.
Other than N2-fixing bacteria; several bacteria like Bacillus, Pseudomonas, Burkholderia etc., and fungi e.g. Aspergilous, Trichoderma, Penicilium, VAM enhance the soil fertility by solubilizing phosphorus or making it bio-available.
Though I am not from your field, I understand that the health / fertility of soil is defined by microbial composition - bacteria, fungi, actinomycetes etc besides the inorganic constituents and also by the physical nature- particle size etc. The beautiful subject "Allelopathy" took me to this world!
Thanks to all for your answer. Now i am going to specify the conditions, why i asked this question ?. One river is there in India called Chambal. It's drain area is 2,00.000 squire KM, and it is completely unfertile. The land is so hard that plant cannot grow their. If we can make this land fertile then India can fulfill it's eatable oils requirement. And the cost of developing that land to fertile is 1,00,000 $ per hectare. It is huge amount for any developing country. Thats why i am looking for cheaper way to do that. And only science can help me to find that way. Thats why i am looking for any bacterial spices which can make that land pours. So by little effort we can make that land fertile.
Should we do such? If yes to what extent? Dabbling with nature must be carefully examined unlike the earlier days. In Godavari delta, most mangroves like in other places had been converted int paddy fields and coconut farms.
I agree human beings are more important- but are we damaging ntheir interest by dabbling?
Bapuji Maringanti Sir thanks for your suggestion but that land is haven for DACOIT. I am belonging from that area. Economically that are is very poor. In early 80s Indian government spread seeds of acacia-nilotica. Now 5-10% land is having forest of acacia-nilotica. Means we can use that area for farming. And according to National Research Center on Rapeseed-Mustard, BHARATPUR that land is very good for mustard farming.
India is using 47% of its land for farming, which is maximum in world. On 18% forest is there and 18-19% is occupied by hills/plateau. Remaining 17-18% of land is unfertile which is neither having forest nor hills/plateau. In my concern, If we can use that land it won't affect the biological condition of that area.
To fulfill the growing requirement of growing population we have to find alternative way. Thats why i am thinking in this way.