University of Minnesota Extension completed a four-year study examining how potassium fertilizer timing affects corn and soybean production across Minnesota.
The research focused on fertilizer application timing, potassium rates, and crop responses to better guide nutrient management decisions for farmers.
Researchers observed soybean yields averaged about one bushel per acre lower when higher potash rates were applied before planting in the spring.
The study connected this reduction to higher chloride levels found in soybean plant tissue following spring applications. Researchers believe excess chloride uptake may negatively affect soybean growth.