calls last year's study on maximizing dryland soybean yields "the Cadillac Treatment" because he
took steps to achieve as high a yielding situation as possible.
"The first thing we did was go to a variety that does well in a high yielding environment," Dunphy
said at the North Carolina Commodities Conference in Durham Jan. 15, where he
released the results of the test.
Dunphy is the North Carolina State University Extension soybean specialist.
For the study, Dunphy
selected the two highest yielding Group V varieties and the two highest yielding Group VI varieties, varieties that perform well in a 60 bushel per acre yield environment.
The varieties he
planted in 2015 were Southern States' SS 5511 N R2, Dyna-Gro's 32RY55, UniSouth Genetics' USG 76S 73R and Syngenta's S76-R6.
The goal was to plant the four varieties from as early as mid-April to as late as mid-May, but Dunphy
said, "the weatherman didn't let us do that.
We planted one of them in early May; we planted two of them in late May and one of them the first day in June."
said the varieties were planted in 15 inch rows at relatively low population rates, 90,000 to 120,000 seeds per acre.
"That was on purpose," he
Potassium was also applied because Dunphy
explains that potassium is needed for the soybean plants to better utilize nitrogen.
Fungicides were also used.
"Cadillac" yields ended up being 54 bushels per acre in Beaufort County, 52.5 bushels per acre in Pender County, 53.3 bushels per acre in Sampson County and 79.5 bushels per acre in Surry County.
said an important lesson learned was the importance of fungicides.
The three he
used were Topguard, Quadris Top and Priaxor.
Looking at all four sites, Dunphy
said the research shows that fungicides are worth the money spent.
"When we put all four sites together, we got a response to fungicides," he
"None of those three gave us a significant response at all four locations; neither did any of them fail."
stressed that fungicide timing is critical.
And that has always been a challenge.