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northeastern Ohio | Innoculant contains rhizobia, a food source and a carrier. The rhizobia numbers are at the peak right after it is produced and the numbers go down every day after that. The rate of decline depends on how it is stored and the amount of food source.
Every package of rhizobia has a minimum guaranteed rhizobia count. For example 5 billion (5x10to the 9th) per gram. It probably starts at 10 billion when it leaves the manufacturer.
After stored at room temperature for 9 months, it is probably down to 5 billion. Room temperature for 2 years, you would probably be down to 1 million. Not good.
But if you store it at 40 degrees for 9 months, it might have 9 billion. Keep it at 40 degrees for 2 years and you might be down to 7 billion. Still good.
Manufacturers must assume that it could be at room temp for an extended period and therefore usually put an expiration date of one season to be on the safe side. | |
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innoculant lasting two years
