 leaf stages V5 to V12 or 14 to decrease maximum kernel numbers. However, some fields in Indiana are probably stressed enough during the current hot spell to impact the potential for kernel numbers prior to pollination. Those fields would be those where early root development has been severely compromised to begin with, meaning fields with significant shallow soil compaction due to the wet spring and tillage that we experienced, or soils that simply don't allow for deep root development, for example, eroded hillsides.