The 1999-2000 experiment investigated the field weed infestation, depending on the crop species (spring barley, oat, buckwheat), and weed control methods in spring barley (post-emergence harrowing, Chwastox 540 SL, post-emergence harrowing + Chwastox 540 SL). The weed infestation depended mainly on the weather conditions, and less considerably – on the crop species. Post-emergence harrowing of spring barley during dry weather was slightly more effective than a single herbicide application. A decrease in secondary weed infestation on the plots from which buckwheat was harvested is noteworthy.

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