Potassium (K) deficiency in corn has become more prevalent in the area. Potassium is essential in a plant for water uptake and photosynthesis. Potassium is as immobile nutrient in the soil and should be managed accordingly. The deficiencies I am noticing are taking place in two specific areas of fields: highest producing areas of a field, and areas with lower organic matter and a courser soil type. The higher producing areas are starting to show deficiencies because these areas in fields are removing the most bushels of grain each year, therefore mining more K from the soil. While our general fertility program has improved with increases in production, many times adding Potassium to fields is overlooked. Any time a soil test's result comes back with K below 200 ppm I start looking at the field needing Potassium. Test results below 100 ppm and the plant is experiencing a deficiency. The following is a picture of a corn field from earlier this year. The corn on the hilltop has an obvious K deficiency while the corn on the lower ground looks healthy. I soil tested each area as well as took a tissue sample. The deficient corn's soil K tested at 82 PPM and the tissue sample confirmed the obvious deficiency. The lower ground had a soil K result of 171 ppm and the tissue result indicated added K would be responsive. For next year we are planning to manage Potassium in the following ways: First, we are going to run KTS in with our 10-34-0 starter fertilizer to place available Potassium near the plants roots for early development. Second, build soil K levels in fields that test lower. Third, utilize MZB to define the zones in each field that will respond to more K and apply accordingly. With MZB, Potassium will be added to zones at varying rates and allow us to get the best return on investment.