Soybean growers continue to look for ways to decrease input costs through herbicide program selection, unfortunately, herbicide resistant weeds continue to affect yield while new resistant biotypes continue to evolve due to limited post-emergent herbicide options. Modern soybean genetics, such as glyphosate (i.e. Roundup), dicamba (i.e. Xtendimax), glufosinate (i.e. Liberty), 2, 4-D, and HPPD (i.e. Callisto) tolerant soybeans, provide herbicide tolerance to increase post-emergence weed control options. However, misapplication and overuse of post-emergent herbicides has led to selection pressure in waterhemp populations. Soil applied residuals are effective as the herbicide is absorbed into the weed at the most vulnerable stage of growth, emergence.
This grant focuses specifically on the continued development of Next Gen Ag conventional variable rate tank mix (CVRTM) programs and objectives achieved through two studies: 1) CVRTM combination soybean injury and yield impact; and, 2) PRE vs. PRE fb EPOST CVRTM combination efficacy. The first study will be new in regards to yield has not been taken in the past on these combinations. The second study is repeated from 2021 and 2022 in an effort to collect data across years and environment and will be conducted at the research farm in Renville, MN, with seed and chemical provided by supporting industry partners.