Are band applications of P and K more efficient and profitable than broadcast?

Study author(s:) Jeffrey Vetsch, Daniel Kaiser, University of Minnesota
Growing season(s): 2019, 2020, 2021, 2022
Minnesota location(s): Waseca, Rochester

Note: for the complete report, including all tables and figures, please download below.

2019 Growing Sseason2020 Growing Season

WHAT IS THIS PROJECT ABOUT?

This project evaluates whether deep-band applications of phosphorus (P) and potassium (K) fertilizers are more efficient and profitable for Minnesota crop growers than traditional broadcast methods. State guidelines have historically allowed for up to 50% fertilizer rate reductions when banding P and K in low-testing soils for corn, but these recommendations were based on older ridge-till research that may not reflect modern equipment, conventional tillage practices, or current hybrids. Researchers set out to update fertilizer recommendations by testing how band versus broadcast methods impact crop yields, nutrient uptake, and overall soil test levels in corn and soybean rotations.

KEY PROJECT GOALS & FARMER BENEFITS

  • Reduce Input Costs: Helps farmers lower upfront fertilizer expenses during tight economic times by determining if lower rates applied via banding can match full-rate broadcast yields.
  • Improve Nutrient Efficiency: Measures how effectively crops absorb P and K under different placement methods and updates critical soil test thresholds to avoid over-fertilizing.
  • Boost Early-Season Crop Growth: Demonstrates how band-placed potassium reduces early-season deficiency symptoms, promoting stronger initial corn height and foliage development compared to broadcast applications.
  • Maintain Yield Potential: Confirms that soil test sufficiency approaches work, ensuring farmers do not lose corn or soybean yield when placing fertilizer efficiently.
  • Protect Water Quality: Evaluates subsurface banding as a strategy to minimize surface phosphorus runoff into nearby waterways.

HOW THE STUDY WAS CONDUCTED

  • Long-Term Field Sites: Conducted at the Southern Research and Outreach Center in Waseca (clay loam soil) and near Rochester (silt loam soil) on plots with wide ranges of pre-existing soil test P and K levels.
  • Crop Rotation: Planted soybeans across all research sites in 2019, followed by corn in 2020, 2021 and 2022 to track yield and nutrient responses across both major regional crops.
  • Placement Comparisons: Applied fertilizer treatments as either broadcast (spread evenly across the field surface) or banded (placed directly near or in the crop row) at varying application rates.
  • Soil & Tissue Testing: Collected soil core samples at 0–6 inch and 6–12 inch depths in June and October, alongside ear leaf samples at corn flowering (R1–R2 stage) and post-harvest grain samples, to measure actual nutrient uptake and removal.
  • Data Analysis: Analyzed crop yield, grain moisture, and plant health data using statistical models to isolate the precise effects of fertilizer placement and rate on harvest outcomes
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