After 33 years of large-plot, independent on-farm research, Marion Calmer, a veteran no-till farmer from western Illinois, has learned there’s a huge difference between maximum physical yield and maximum financial yield.

Calmer will discuss 10 years’ worth of yield, economic and soil-test data from his fertility plots and how he identifies profitable applications of nutrients. Years of surface-applied phosphorus, potassium and lime on these plots not only show the nutrients are stratifying, but his PH levels are as well. Calmer will share some innovative ideas for managing nutrient challenges without sacrificing yields.

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