K Index for Peanut Peanut Notes No. 63 2022

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What KI do you use as a cutoff for not putting any potash out on peanuts? The soybean folks are telling me they are recommending 50 for soybean now.


Anything below 70 needs some potash. At 50, NCDA&CS recommends 30 pounds per acre. [Table 3-8 in 2022 Peanut Information lists a series of K indices and rates of potash recommended for this nutrient.]

Follow up:

Okay yes, I understand but most applicators can’t spread 30 pounds. You have to round up to 100 pounds product which would be 60 units of K.


Agree, equipment can’t go that low. Based on yield calibration curves from years ago, the need is there if KI is below 70. If soil test indicates a need, I would apply the lowest possible rate the equipment will deliver. I realize this is extra as KI approaches 70 and that fertilizer is expensive, but I would not short the plant. I am not aware of any data sets that are available that show a relationship of yield versus KI that could be used for a net return calculation.