Response surface optimization of imazethapyr dose and application timing for weed suppression and faba bean yield.
Taheri-Garavand A, Ahmadi A, Akbarpour O, Fanourakis D
Crop Improvement
Faba beans are one of the few crops that fix their own nitrogen and can dramatically cut fertilizer needs in a home vegetable patch or small farm, but they're notoriously vulnerable to weed competition in their first weeks—knowing exactly when and how much herbicide to use means growers can protect that yield without accidentally poisoning the crop itself.
Scientists tested a common weed-killing chemical on faba bean fields to figure out the best dose and the best time to spray it. They found a sweet spot: moderate amounts applied right around planting time kept weeds down and let the beans grow strong and produce lots of seeds. Spraying too much or waiting too long to spray actually damaged the beans, even if it killed the weeds.
Key Findings
Imazethapyr applied at 250–500 mL per hectare from pre-planting through 10 days after sowing maximized faba bean grain yield and canopy development.
Higher rates (≥750 mL/ha) or late post-emergence applications caused phytotoxic crop damage, reducing yield despite better weed suppression.
Response surface models achieved high predictive accuracy for leaf area index, 100-seed weight, and weed dry weight, validating RSM as a precision decision-support tool.
chevron_right Technical Summary
Researchers found that applying the herbicide imazethapyr at moderate doses (250–500 mL per hectare) early in the faba bean growing season—from before planting through about 10 days after sowing—best controls weeds without harming the crop. Higher doses or late applications hurt the bean plants even while killing weeds.
Abstract Preview
Effective weed management in faba bean (Vicia faba L.) requires precise adjustment of herbicide dose and application timing to achieve effective weed suppression while maintaining crop growth and y...
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