Is cooler weather good or bad for grain fill and yield?
The following article was written by Bob Neilson, Agronomy Dept., Purdue University. While the weather stats presented are for East Ventral Indiana and may not be exact to those experienced in Southwestern Ontario, the general trend of cooler weather is being seen in all corn growing regions and therefore should have the same implications on grain fill and yield. Corn was likewise planted during similar dates and with similar soil conditions in Indiana as it was in SW Ontario.
Recent early mornings with temperatures hovering in the upper 40’s (F) and afternoon highs less than 80F are certainly not synonymous with those we typically experience during these “dog days of summer“. While comfortably pleasant for us humans, there are those who question whether such unseasonably cool temperatures are good or bad for the corn crop as it progresses through the important grain filling period.