Utilizing Remote Sensing to Determine the
Relationship Between Sulfentrazone Herbicide and Soybean Injury
Contacts: Reid J. Smeda and William G. Johnson
MU
Department of Agronomy
Year One
Because weed populations often are unpredictable from year to year and vary by species, growers broadcast applications of residual, soil-applied herbicides or utilize multiple applications of postemergence herbicides. One of the drawbacks of using residual herbicides is potential crop injury, frequently reported under cool, wet conditions. These conditions are common in Missouri in early spring, especially on claypan soils in the northeast region. Injury is commonly reported with sulfentrazone (AuthorityTM) and sulfentrazone containing herbicides such as Canopy XL TM, which are widely used soybean herbicides.
The objectives of this research are to assess site specific effects of sulfentrazone on visible soybean injury and harvestable yield. Specifically, labeled rates of Canopy XL will be applied to an area planted with soybean, and herbicide damage assessed throughout the growing season with remote sensing technology and visual observations. These damage estimates will then be correlated with precision monitored soybean yield.
Year Two
Preliminary results suggest that there is a noticeable influence of sulfentrazone on soybean development and yield. Much of this influence is based on environmental conditions after herbicide application but before soybean plants reach VI. In 2000, a greater than one-inch rainfall combined with cool night temperatures within 48-96 hours of herbicide application triggered the development of crop injury. Because there is a strong influence by temperature and soil moisture, this type of research needs to be conducted over time to substantiate the findings.
The objectives of this research for 2001 are to repeat the study conducted in 2000.
2000 Progress Report | 2001 Progress Report
2000 MPAC Funded Projects | 2001 MPAC Funded Projects
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