Peanut Response to Simulated Drift Rates of Glufosinate
2011
Jordan, David L. | Johnson, Virginia A. | Fisher, Loren R.
Utilization of glufosinate resistant corn (Zea mays L.), cotton (Gossypium hirsutum L.), and soybean [Glycine max (L.) Merr.] is becoming increasingly important in weed management strategies, especially where glyphosate resistance is a major problem. However, glufosinate drift to adjacent non-tolerant crops and direct application to sensitive crops are concerns. Research was conducted to determine peanut (Arachis hypogaea L.) yield response to glufosinate applied at rates ranging from 0.015 to 0.48 lb ai/acre when peanut was 4 to 6 inches in diameter. Visible injury increased and pod yield decreased relative to non-treated peanut when glufosinate was applied at approximately 0.08 lb/acre (approximately one sixth the manufacturer’s suggested use rate for most crops). Cubic functions were significant when plotting visible injury and percent reduction in pod yield versus glufosinate rate, and visible injury and pod yield were negatively correlated (P < 0.0001, r² = −0.845). These results suggest that early season visible injury three weeks after application is a relatively good predictor of yield loss when glufosinate injury occurs in peanut.
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