For Rhizobia and Pseudomonas we can use glycerol as a best liquid carrier. Addition of glycerol preserves the viability of bacterial cells and enhances shelf life. Apart from this glycerol also holds considerable amount of water and protects cells from desiccation by slowing the drying rate.

Thanks Dr Antoun and Sakshi. Is this glycerol based bioformulation economically viable, specially in countries like India?

Regards

You may also try sodium alginate gel for the purpose.

Dear sir,

You may find some valuable information here:

Pandey and Maheshwari. (2007) Bioformulation of Burkholderia sp. MSSP with a multispecies consortium for growth promotion of Cajanus cajan. Can J Microbiol. 2007 Feb;53(2):213-22.

Thanks Prof Nand Lal.

And Gaurav you know this paper is from my lab only.

Glycerol ok but PEG at optimized concentrations will work well

Cost effective depends on concentrations. There wont be much burden in cost while doing liquid formulation. Industrial grade are very manageable