Maximum Yield Research Harvest - September 2012
[University of Arkansas Division of Agriculture Research and Extension University of Arkansas System. Arkansas Soybean Promotion Board. Ryan Van Roekel, Crop, Soil and Environmental Sciences, University of Arkansas System]
Hi, I’m Ryan Van Roekel, Ph.D. graduate student working with Dr. Larry Purcell on the maximum yield of soybeans. We’re here today in Newport, Ark., to harvest one of my strip trials. [Ryan stands in a soybean field that has been defoliated.]
What we have here for a strip trial is essentially a large scale variety trial, where we have five different varieties replicated across this field. [Video shows a combine in the field.] There are 12 rows of each variety. [Slide shows a table of numbers.] And we are harvesting them one at a time and weighing them on a weigh wagon to determine bushels per acre. [Ryan standing in a field]
So far from the first few plots we’ve taken out, we’re in the lower nineties with one plot even topping 98 bushels per acre. We’re hoping to continue that upward trend. [Video shows a combine]
Our goal for this research was 100 bushels per acre. I don’t think we’re going to average quite that high, but we’re getting very close. [Video shows a combine harvesting soybeans and then transferring harvest from the combine to a weigh wagon.] We feel that one of the biggest limitations to our yields this year was the weather. We had very high temperatures during flowering and pod set, which may have resulted in more pods being aborted and lowering our yields.
[Ryan standing in a field] Some of the management practices that increased our yields in this field were early planting, timely and frequent irrigation, strict pest management and using excellent varieties.
In addition, we’ve also applied supplemental nitrogen to this field in the form of urea being flown on late season, into the R5 and mid-R5 and R6 growth stages. [Video shows a digital scale.] Dr Purcell and I believe that soybeans fixing up nitrogen in general to maximize yields in Arkansas. [Video shows a combine.] However as yields approach and increase above 80 bushels per acre, supplemental nitrogen may be an important management factor to maximize our yields.
[Ryan standing in a field] This research was funded by the Arkansas Soybean Promotion Board and Pioneer Hybrid and we’ll be doing this again next year. [Slide – Research funding provided by Arkansas Soybean Promotion Board and Pioneer – a DuPont Business.]
For more information and our results, log onto www.uaex.edu. Thanks.
[www.uaex.edu. University of Arkansas Division of Agriculture Research and Extension University of Arkansas System. Arkansas Soybean Promotion Board]