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northeastern Ohio | We first need to define "triple rate". If you are using a non-sterile peat, then a triple rate will only give you 900,000 rhizobia per seed. But if you are using a sterile product, then a triple rate will be 3 million rhizobia per seed.
In my experience, soybean grain yield seems to peak when you reach 2 million rhizobia per seed (double rate for sterile innoculants). I've seen studies that tried 3 million and very few of these studies resulted in increased grain yield, BUT there was an increase of biomass above and below the ground when going from 2 million to 3 million. So we did see an increase of nitrogen production with the triple rate, but it didn't translate to yield very often. Will this nitrogen carry over to next year's corn crop ? It might if it is not lost over the winter. If you follow soybeans with wheat or a cover crop, then they might be able to scavenge the nitrogen. | |
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Virgin Soybean Ground
