B-H Genetics shared Better Yield in the Field's post.
A good refresher from Dr. Bowling on corn emergence and early growth!
We will be planting corn at Ganado today. Today will remind me a lot of my Pioneer days. My experiences with Pioneer were some of the best in my working career. I am thankful for all the company taught me about corn production, working with customers, and the Long Look!
So, today as we plant I will be thinking about one of the basics around plant emergence.
Corn emergence is highly dependant on the amount of heat units (called Growing Degree Days or GDUs) that accumulate once the seed is planted. For corn, it takes approximately 120 heat units for emergence and may vary slightly depending on planting depth and amount of soil insulation provided by surface residue. Therefore, if the average daily GDU accumulation were 10 GDUs per day, it would take 12 days for plants to emerge.
Heat units or GDUs for corn emergence can be calculated by taking the average temperature of the day, (low plus high divided by 2) and subtracting the base unit of 50 for corn. Temperatures below 50° Farienheit (F) or above 86°F are not used since there is little growth of corn below 50 degrees and conversely when above 86°F. Example: if the low is 48 and the high is 70 then: (50+70)/2-50 = 10 GDUs.