Updated August 19, 2022:
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Objectives of the research:
• Evaluate soybean plant growth and seed yield response based on timing of planting following application of preplant, low-dose soil rate of dicamba with or without water activation.
Study locations, treatments and data:
• The initial year of this study was conducted at three NDSU research sites in 2021: Carrington (irrigated), and Minot and Prosper (dryland). Four targeted treatments:
1) untreated;
2) treated (Clarity or generic dicamba preplant applied 4 fl oz product/A);
3) soybean planted <14 days after dicamba application and before rain or irrigation; and
4) soybean planted >14 days after dicamba application and 1"rain or irrigation.
Field data included soybean plant development (emergence, flower and maturity) dates, plant density and canopy, injury ratings 1-2, 3-4 and 6-8 weeks after plant emergence, and crop height 3-4 and 6-8 weeks after emergence. At Carrington, soybean seed yield and quality data were generated.
Preliminary results:
• Soybean plant injury (reduction in biomass) with the first planting date (2 days following application of dicamba at Prosper and 7 days at Minot) was 53-73% at Prosper and 85-87% at Minot. Plant injury with the second planting date (16 days and 0.74 inches of rain following application of dicamba at Prosper, and 20 days and 0.96 inches of rain at Minot) was 18-45% at Prosper and 22-39% at Minot. At Carrington, the first evaluation indicated 43% injury with the early planting date (6 days and 0.08 inch of rain after application of dicamba), while minimal injury (<6%) was observed after the second planting date (19 days after application of dicamba and >2 inches of water). Plant density was reduced 17% with the first planting date following application of dicamba at Carrington; 68% at Minot and 55% at Prosper. At Carrington, soybean seed yield from dicamba-treated soil was similar to the untreated checks.