Update:
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Emergence
Take Off ST did not provide improved emergence in the 2021 trials and actually suppressed germination at the WYE middle plating location. However, it should be noted that the planting dates for the WYE location were later than those at WMREC, which could have contributed to this observation. In the previous two years of study, emergence of early planted soybeans was increased with Take Off ST. Even when relative emergence data was calculated and combined across locations there were no significant differences (data not shown, P>0.10). This is in contrast to what we observed in 2019 and 2020, where our trials that were planted earlier in the year had significantly better emergence with Take Off ST. This may be explained by weather conditions; 2019 and 2020 was cooler and wetter at our early planted locations, especially during the month of April compared to 2021 where we experienced excellent planting conditions at both locations. Data from these three years suggest that Take Off ST may help soybeans emerge in soils that are cooler and wetter, but may have little benefit for later planted soybeans. This effect may be attributed to the prothioconazole, a fungicide seed treatment that prevents preemergence damping off caused by many soilborne pathogens that are common in cool, wet soils.
Grain Yield
Yields were slightly above average at WMREC and slightly below average at WYE; this difference is likely explained by planting dates. The WMREC plots were seeded approximately one month earlier than the WYE plots.
Individual plot yields varied more at WMREC than at WYE, which could be explained by significant groundhog pressure at WMREC. As a result, extreme outliers in the dataset for WMREC were excluded in the data analysis. The only statistically significant difference in yield was observed at WMREC, where Take Off ST treated seed yielded significantly more than the non-treated seed for the middle planting date. All other pairwise comparisons within planting date × location were the same.
In order to eliminate location as a variable in our combined data analysis, relative yield was calculated. When treated seed was compared to non-treated seed in this fashion, Take Off ST treated seed yielded significantly better than non-treated seed for early and middle plantings. These data coincide with our previous observations of improved plant emergence at earlier planting dates.
None the treatments affected grain moisture or test weight.
Future research should be focused on repeating these trials to understand the effect of Take Off ST on soybeans planted at different planting dates in comparison to non-treated seed.