One of the unique properties of Roundup Ultra is its ability to control larger weeds than other postemergence soybean herbicides. These escapes are often due to poor control with earlier weed control practices, or weather or management conditions that prevented timely cultivation or herbicide application when weeds were small. Roundup Ultra can provide reliable control of large weeds resulting from early failures to control smaller weeds. Weed Interference Reduces Crop Yields Control of large weeds , though sometimes necessary, should not be considered a standard weed management practice. The reason is weed interference , which can irreversibly reduce crop yields early in the season, even though weeds are later eliminated.
Farmers control weeds in crops because they reduce crop yield.
The trick is to control them before the weeds start to compete. With the availability of Roundup Ultra to effectively control large weeds, the chance of late application, after early competition has reduced soybean yields, is increased. More discipline is required to make timely applications when a herbicide has a wider window of application. This article will concentrate on duration of weed competition, with the assumption that weed density is high enough to cause yield reductions, which is the case in most farmers' fields. One is the period of time that complete weed control is required following planting to prevent yield loss.