Inoculant Failure Peanut Notes No. 127 2019
I was recently asked how to handle N deficiency in new ground. The problem occurred when the inoculant was applied in a tank that had some starter fertilizer for another crop that was not cleaned out. Inoculant contains a living organism, so we do need to make sure nothing is present that will kill the Bradyrhizobia bacteria that fixes the N. The solution for this year is to apply ammonium sulfate as soon as possible at 500 pounds/acre. Expensive but necessary. Peanut needs a substantial amount of N (as much as corn or cotton does) for optimum yield. It is better for that to be delivered through nitrogen fixation than added fertilizer, but if the inoculant does not work a substantial amount of N has to be added as quickly as possible.