Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Proceedings
Publication Acceptance Date: 1/27/2003
Publication Date: 9/1/2003
Citation: Price, A. J., D. W. Krueger, G. Roberson, G. G. Wilkerson, and A. C. Bennett. 2003. Evaluation of variable-rate herbicide application in soybean. Proc. Southern Weed Sci. Soc. 56:229. Interpretive Summary:
Technical Abstract: Field experiments were conducted at two North Carolina locations in 1999, 2000, and 2001 and on-farm in Port Royal, VA in 2000, 2001, and 2002 to evaluate scouting software as well as theoretical gains from site-specific herbicide application at these locations. Three on-farm experiments were also conducted in Lenoir, Wayne, and Wilson Counties in North Carolina in 2002 to evaluate a systems approach to site-specific herbicide application and compare the system to whole field herbicide applications. Analysis of data from the studies in North Carolina from 1999 to 2001 and Virginia showed that site specific herbicide applications could have reduced the volume of herbicides sprayed from 25 to 68%. In 2002, for the Lenoir Co. site, HADSS recommended reduced rates in 13 of 30 cells and the addition of a second herbicide in one cell, compared to the whole field recommendation. The Wilson Co. site had a weed infestation that met treatment threshold in only 6 of 39 cells. Thus, site specific treatment at this location increased herbicide use compared to the whole field recommendation. The Wayne Co. site was not amendable for site-specific application.