Figure 1. Percent of acres reported to FSA as prevented plant by county in several Midwestern states as of August 1, 2019.
Figure 2. Field with a large fallow area due to flooding in 2019.
Proactive management will be required to prevent fallow syndrome in this area if the field is rotated into corn in 2020.
Corn planted in fields in which no crop was grown the previous season can have reduced early-season growth (Figure 3) and lower yields, a condition known as fallow syndrome (Wiersma and Carter, 2013).
Figure 3. Corteva Agriscience field demonstration site in which plots that were fallow the prior season have a visible reduction in early-season corn growth relative to adjacent plots planted to soybeans the prior season.
Figure 4. Thermal imagery showing the effect of ground cover on soil surface temperature. Soil temperature at mid-day under a corn crop canopy was 78.7 ºF, compared to 113.9 ºF for an adjacent area of bare ground under full sunlight. Imagery taken August 2, 2019, 11:23 a.m., Johnston, IA.
Figure 5. Prevented plant field in 2019. Herbicide was applied but larger weeds were not completely killed and will likely still produce viable seed, increasing the weed seedbank for the 2020 season.
Figure 6. Prevented plant field seeded to a grass cover crop in 2019.
Authors: Matt Essick, Adam Gaspar, Clyde Tiffany, and Mark Jeschke
The foregoing is provided for informational use only. Please contact your Pioneer sales professional for information and suggestions specific to your operation. Product performance is variable and depends on many factors such as moisture and heat stress, soil type, management practices and environmental stress as well as disease and pest pressures. Individual results may vary.