Silica, first always.
Ferts,
Microbes,
Microbes, can be grouped into three categories based on their optimal pH:
Acidiphiles 5 or less
Neutrphiles 5-9
Alkaliphiles: 9 or more
Bacteria are generally neutrophiles. They grow best at neutral pH close to 7.0. Efficiency drops about 50% for each 1.0 deviation in either .
Silica can have a number of effects on microbes, including:
Microbial silicification: Microbes can be encrusted, impregnated, or replaced by amorphous silica.
Microbes can play a passive role in this process by providing organic surfaces for silica to bind to.
Cellular growth: Silica can alter the cellular growth of microbes, such as E. coli K-12.
Silica can cause a switch from fermentative to aerobic metabolism, and can also change the nutritional capabilities of the microbe.
Plant growth: Silicon can improve plant growth and development by increasing nutrient availability in the rhizosphere.
Bacterial morphology: Silica particles can change the morphology of bacteria.
Spore-forming bacteria: Amorphous silica can increase the number of spore-forming bacteria.
CO2 production: Amorphous silica can increase CO2 production by altering nutrient availability.
Bacterial infections: Silica nanoparticles can be used to treat bacterial infections.
Bacterial adhesion: Silicon dioxide can increase the negative charge of a bacterial membrane, which can affect its adhesion to a surface.
Good luck.