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Grain Rye Residues and Weed Control Strategies in Reduced Tillage Potatoes

  • Luis E. Lanfranconi (a1), Robin R. Bellinder (a1) and Russell W. Wallace (a1)

Abstract

Experiments were conducted to evaluate the effect of tillage, rye residue levels, and control strategies on weed suppression and potato yield. Reduced tillage (RT) yields in 1989 were lower than in conventional tillage (CT) due to high hairy galinsoga populations. However, in 1990, potato yields were greater in RT when early emerging weeds were suppressed. Increasing residue levels up to 2300 kg ha-1 had no effect on weeds or yields in either year. In a separate study, preemergence herbicides (linuron plus metolachlor, 1.7 kg ai ha-1 each) applied 10 d after planting (DAP) in reduced tillage controlled weeds for 6 wk, but efficacy decreased after hilling. Metribuzin applied postemergence (0.19 kg ai ha-1) 7 d after hilling controlled late germinating weeds. Potato yields were greatest when the preemergence herbicides were applied.

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Keywords

Grain Rye Residues and Weed Control Strategies in Reduced Tillage Potatoes

  • Luis E. Lanfranconi (a1), Robin R. Bellinder (a1) and Russell W. Wallace (a1)

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