New Study Compares Dual-Line and Single-Line Precision Spraying Systems

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A new study from the University of Nebraska-Lincoln (UNL) compared two different precision spraying systems - a dual-line system that enables broadcast application of residual herbicides while targeting non-residual herbicides only on weeds, and a single-line system that does not allow separate application of residual and non-residual products. The trials in corn and soybean found the dual-line system resulted in higher yields and better weed control compared to the single-line system or eliminating residual herbicides altogether.

Why it matters

As AI-driven precision spraying becomes more common, it's important to implement the technology in a way that maintains fundamental agronomic best practices like the use of residual herbicides. This study shows that a dual-line precision spraying system is the most effective approach, allowing growers to capture the benefits of precision application while still using a full herbicide program.

The details

The UNL trials compared three two-pass herbicide programs - one with residuals in both pre-emergence (PRE) and post-emergence (POST) applications, one with residuals only in PRE, and one with no residuals at all. The dual-line precision spraying system enabled broadcast application of residuals while targeting non-residual herbicides only where weeds were present. The single-line system did not allow this separation.

• The trials were conducted in the 2025 season at the South Central Ag Lab near Clay Center, Nebraska.

What’s next

The results reinforce that a dual-line precision spraying system is the most agronomically sound approach, enabling growers to capture the benefits of AI-driven precision application while maintaining a best-practice herbicide program.