Notice that Table 2 lists four clover groups. Inoculants for the three other clover groups will not be effective for arrowleaf clover, for example. It is best for both retailers and farmers to store inoculants in a refrigerator to keep them cool. Do not freeze the inoculant. If a refrigerator is not available, store the inoculum in a cool, dark place until ready for use.
Commercial inoculants have expiration dates displayed on the packages.
If the expiration date has passed, do not purchase the inoculant. Dead rhizobia have no value. Back To Top Recognize Effective Nodules Nodule size, shape and number vary with the host plant and Rhizobium strain. Red and white clovers have club-shaped and lobed nodules. Alfalfa nodules are more branched and longer, while cowpea, peanut and soybean nodules are spherical.