Check out this video from Jacob Morgan, Extension agent in Jones and Lenoir Counties.  This video does a good job of highlighting a few nutrient deficiencies we have been seeing, especially phosphorous.

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Here is a video I did with Chris Jernigan, NCDA Regional Agronomist, about nutrient deficiency identification and corrective measures.

https://www.youtube.com/watch?v=jsCbC9J-Nj8