Preparations of micro-organisms may be used to improve the overall condition of the soil or to improve the availability of nutrients in the soil or in the crops.
Féadfar ullmhóidí de mhiocrorgánaigh a úsáid chun riocht na hithreach ina hiomláine a fheabhsú, nó chun infhaighteacht cothaitheach san ithir nó sna barra a fheabhsú.