Low pH Symptoms

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The following images were provided by Richard Rhodes with the problem most likely associated with low pH (although the pH does not differ that much.) I tried as hard as I could to make it a zinc issue or a problem with incorporation of metolachlor on deep sand. When the soil pH gets this low a number of things can happen and symptoms can reflect a number of nutrient issues and may make peanut susceptible to other stresses. But I am suspicious of the “straight line” in the last image. Take a look at Table 3-5 in 2015 Peanut Information on page 20 to get an idea of the impact of low pH on peanut yield and yield of other major agronomic crops. I will send the soil analysis next.

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Article first appeared as North Carolina Peanut Note (PNNC-2015-107)