DuPont Pioneer is interested in helping customers get the most out of their nitrogen (N) investment.
In 2013, DuPont Pioneer field agronomists conducted a series of studies to understand the value of side-dressed or in-season N applications.
30 on-farm locations
Results are pooled across 48 hybrids
• 30,000 • 34,000
• 38,000 • 42,000
Farmer standard N management
Farmer standard plus 50-75 lbs/acre side-dress N application
Results and Conclusions
Farms in Iowa received abnormally high rain fall in late April and early May. This created conditions favorable for loss of fall or preplant applied N.
The yield advantage by locations is shown in Figure 1.
>Side-dress N modestly improved the response to plant population in environments yielding between 150 and 200 bu/acre Figure 2.
At locations yielding more than 200 bu/acre, side-dress N strips were at a higher yield level across populations.
Extreme drought and heat from silking through grain fill most likely limited yield responses to side-dress N.
Despite the unusually dry summer, this research demonstrates the value of side-dress and in-season N applications.
Figure 1. Yield advantage with the addition of a side-dress N
application. n = 30 locations
Figure 2. Corn yield response to population and side-dressed N at
locations yielding between 150-200 bu/acre. n = 11 locations and
Figure 3. Corn response to population and side-dressed N at locations
yielding greater than 200 bu/acre. n = 16 locations and 28 hybrids.
2013 data are based on average of all comparisons made in 27 locations through November 25, 2013. Multi-year and multi-location is a better predictor of future performance. Do not use these or any other data from a limited number of trials as a significant factor in product selection. Product responses are variable and subject to a variety of environmental, disease, and pest pressures. Individual results may vary.