Potash and Pops Peanut Notes No. 30 2019
Excessive K can interfere with calcium uptake by pegs and pods in the pegging zone. However, with most rates being applied in peanut that are designed to maintain fertility, the risk of creating a problem is minimal. We observed that 250 lbs potash/acre applied to the soil surface immediately after planting did not affect yield or quality in work conducted many years ago. But make sure you apply an adequate but not excessive amount of gypsum. In strip till, incorporate potash as much as possible. My assumption is that if soil tests call for K then the plants need it and it should be applied. One reason to maintain adequate fertility levels in all crops in the rotation is because this approach minimizes the likelihood of needing to apply a large amount of potash at one time to correct a fertility issue. Saturating the pegging zone with high amounts of K can be a problem, but applying relatively low, remedial rates does not seem to create an issue for calcium uptake and subsequent kernel development.