If molybdenum is a limiting factor, apply it as a seed treatment with the inoculum. Some inoculants have molybdenum already incorporated. Read the package label. Three basic forms of commercial inocula are solid, liquid and freeze-dried. The most commonly used are solid, peat-based inoculants that can be purchased for seed or direct soil application.
Liquid inoculants are available in broth culture or as frozen concentrate.
Broth or frozen concentrates usually are mixed with water and sprayed into the seed furrow at planting. Because liquid inoculants must be kept frozen or refrigerated during shipment and storage, their availability through normal distribution channels is limited. Seed-applied inoculants exist as planter box additives, preinoculated seed and custom inoculants. The planter box additive, where inoculant is mixed with seed in the planter box, is most common. This can be accomplished by applying dry inoculum or a slurry directly to seed.