Home

Organizing Committee

Presentations

Poster Presentations

Outcomes


Poster Presentations


Impact of fungicide application timing and crop row spacing on soybean canopy penetration and grain yield.

Presenter: Shawn Conley, Dept Agronomy, Purdue University
Coauthor(s): Shane Hanna, Dept Agronomy, Purdue University, and Gregory Shaner, Dept Botany and Plant Pathology, Purdue University

The objectives of this experiment were to quantify the impact of crop row spacing and spray application timing on spray canopy coverage, and to quantify the impact of fungicide application timing on crop yield and crop injury caused by sprayer wheels. The experimental design was a randomized complete block with three replications. The main plot factors were crop row spacing (30, 15, and 7.5 inches) and spray application timing. Spray canopy coverage was quantified at 30-cm height increments in the soybean canopy. Plots were 45 by 300 ft. Row spacing did not affect coverage at any application timing. At R1 soybean spray canopy coverage was 91, 62, and 8% at the 60, 30, and 0 cm heights, respectively. At R3 soybean spray canopy coverage was 60, 21, 2, and 2% at the 90, 60, 30, and 0 cm heights, respectively. At R5 soybean spray canopy coverage was 70, 50, 4, 1 and 1% at the 120, 90, 60, 30, and 0 cm heights, respectively. Grain yield was 7% greater in the 7.5 and 15 inch row spacing than in the 30-inch row spacing in the non-wheel track area. Yield was similar among all row spacings for combine swaths in the wheel track area. Fungicide application time affected neither yield nor frog eye leaf spot severity. Averaged across all row spacings grain yield was greater in the non-wheel track than in the wheel track areas at the R3 (7.0%), R5 (7.2%), R3+R5 (9.6%), and the R1+R3+R5 (5.2%) application timings.

View Poster                                         Back to Poster Presentations