Leaching of Inoculant Peanut Notes No. 75 2025
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Collapse ▲I had a question about whether or not inoculant applied in the seed furrow will leach out of the effective zone to infect roots and promote biological nitrogen fixation. We have not tested this, but my thought is that the inoculant may leach some but not so much that it does not work effectively. The roots will also move down into the zone where some of the inoculant has leached, if in fact it leaches. But based on what I know right now, there should not be a problem with inoculant leaching well bellow where the root system will be for infection.
Keep in mind that we may be getting large amounts of rain, but with beds, a lot of the water will run off the bed into the row middles. With the exception of where some of the rain water ponds, there shouldn’t be an excessive amount of leaching right around the seed furrow.
However, we won’t know for sure until 40-45 days when the tap roots have nodules or not. But right now, I don’t think leaching is an issue across the field.
In the same conversation, the person asked if there was any way to knife in inoculant. I don’t think this is a solution. The inoculant needs to be in or near or just below the seed furrow and not off to the side.
At 45 days, if there are fewer than 15 nodules on or near the tap root, one needs to consider a nitrogen application. I’ll provide more information on that in early to mid-June.