Manganese and Nitrogen Deficient Peanuts Peanut Notes No. 138 2025

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I recently received images of peanuts that had only 5 nodules on the taproot (entire root system) and manganese deficient peanuts. Here are my responses.

Manganese

Any chance this soil has high pH. Close up symptoms look like manganese which can be deficient at high pH. Apply a product that delivers an adequate amount of manganese. Techmangum, for example. It contains 27% manganese sulfate at 3.5 pounds product per acre. Other products are available, but need to jump on the manganese deficiency. See discussion on liquid products.
Nitrogen
How many nodules do you have on the tap root after digging the roots up? At 45 days after emergence, if peanuts are yellow and only 5 nodules, need to apply 500 pounds ammonium sulfate.

Back to first question. Wet soils can make bacteria much less active. But I don’t think it kills all of the bacteria. I have seen many low spots in fields where water stood and peanuts green back up over time after soil dried. We also have many fields that get waterlogged in winter or spring and then peanuts are planted without an inoculant. Nitrogen fixation still occurs.

The question is what to do right now at about 45 days into the season. If yellow peanuts with nitrogen deficiency and 5 nodules, the grower needs to apply AMS at 500 pounds per acre. Time is of the essence. In absence of adequate N fixing bacteria, peanuts need just as much applied N as a corn crop would get in that field. Very expensive but the only way to get yield up to where it needs to be. 2025 Peanut Information has more details.

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