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Lessons learned in Ohio’s updated fertilizer recommendations

At the recent 4R Field Day in Hardin County, Ohio State soil fertility specialist Steve Culman presented on the updated fertilizer recommendations through 300+ on-farm strip trials since 2014.

He said some main take-home points he hoped to get across to agriculturalists were:

  • From 2014 – 2017, 300+ on-farm strip trials were conducted across Ohio evaluating corn, soybean and wheat response to N, P and K fertilizer.
  • Yield responses to P and K fertilizer in soils at or above the current maintenance range were very rare.
  • Long-term data from 3 sites show that when Ohio soils are in the current maintenance range, they can supply sufficient P and K to meet corn and soybean demand for many growing seasons without fertilization.
  • Recommended corn N rates were updated this spring and are based on maximizing farmer profitability, not maximizing yields.
  • Corn, soybean and wheat are yielding more grain with less nutrient: Grain nutrient removal per bushel of grain is lower than it was 20 years ago.

Further details in this video.

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