On-Farm Evaluation of Twin-Row Corn and Soybean in Southern Minnesota Lizabeth A.B. Stahl 1*, Jeff A. Coulter 2, and Seth L. Naeve 2 1Worthington Regional Extension Office, Worthington, MN, and 2University of Minnesota, St. Paul, MN *Corresponding Author PH: (507) 372-3912; E-mail: firstname.lastname@example.org ABSTRACT MATERIALS & METHODS Growers are questioning if crops planted in twin rows, a system where crops Trials in corn and soybean were initiated in 2010 in The same planter was used for all treatments at aare planted in row pairs six to eight inches apart and the center of row pairs areseparated by 30 inches, yield greater than crops planted in 30-inch rows. This southern MN with 2 farmer cooperators who have been site: One tool bar was switched off for the 30-inchstudy was initiated to determine 1) if corn and/or soybean yield could be planting crops in twin rows for several years rows. Seeding rates were set by adjusting the planterincreased by planting in twin-rows compared to 30-inch rows and 2) if the according to manual recommendations.response to planting population differs in twin rows compared to 30-inch rows. Treatments were arranged in a 2 x 3 factorialReplicated trials were established by Welcome and Wilmont, MN with twoproducers who had been planting crops in twin rows for a number of years. Twin experiment in a randomized complete block design Data collected included stand, moisture, and grainrows were compared to 30-inch rows at 3 planting populations in corn (33,000, with 4 replications at each site. Treatments included yield for both crops; stalk lodging and test weight for38,000, and 43,000 live seeds/ac) and soybean (100,000, 140,000, and 180,000 two row widths (30-inch rows and 22-/8-inch twin rows) corn; and percent stand loss in soybean.live seeds/ac). Stand counts were taken after emergence in both crops andagain in soybean prior to harvest. Grain yield and moisture were recorded at at 3 populations in corn (33,000, 38,000, and 43,000 ANOVA was used for statistical analysis and meansharvest. Results were analyzed by ANOVA and means separated using Fisher’s plants per acre (ppa)) and soybean (100,00, 140,000,Protected LSD at the 0.05 and 0.10 significance levels. Row spacing and separated using Fisher’s protected LSD (α = 0.05).population had no effect on soybean yield at either site in 2010. Corn yield was and 180,000 ppa).greatest in twin-rows at the highest population at the Wilmont site while rowspacing had no effect on yield at the Welcome site. This study suggests planting RESULTS & DISCUSSIONcorn in twin-rows can result in a slight yield increase at very high populations, 230 225although there was no clear advantage to planting at very high seeding rates LSD (.05) = 2.9 bu/ac LSD (.05) = 1.2 229 228 220 INTRODUCTION 227 Yield (bu/ac) YIeld (bu/ac) 226 215Narrow-row crop production has the potential to increase 225 30" Rowscrop yield and profits. Planting crops in twin-rows is a Twin Rows 224 210variation of narrow-rows where the crop is planted in row 223pairs 6 to 8 inches apart and 30 inches separates the 222 205center of row pairs. A major advantage of twin-rows over 22115- or 22-inch rows is that no additional major equipment 220 200modifications are needed beyond modifications to the 33,000 38,000 43,000 33,000 38,000 43,000planter. Prior to this work there was no published Figure 2: Corn yield as affected by population Figure 3: Corn yield as affected by population xUniversity research on twin-row corn and soybean averaged across row spacing at Welcome in 2010. row spacing at Wilmont in 2010.production in Minnesota. This research will help growerswho are considering whether or not to invest in a twin- LSD (.05) = NS LSD (.05) = NS CONCLUSIONSrow planter for corn or soybeans. At Welcome, corn yield was maximized at 38,000 ppa. Yield was not affected by row spacing and there OBJECTIVES was no significant row spacing x populationThis study was initiated to determine 1) if corn and/or interaction.soybean yield can be increased by planting in twin-rows At Wilmont, corn yield was greatest at the highestcompared to 30-inch rows and 2) if the response to population in twin rows, while yield was lowest at thisplanting population differs in twin rows compared to 30- population in 30” rows. This indicates the potential forinch rows. corn to better tolerate higher populations in twin rows than in 30-inch rows, although differences were not a b Figure 4: Soybean yield as affected by population consistently seen. x row spacing at Welcome in 2010. At both sites, soybean yield was not affected by row spacing or population, and there was no significant 59 LSD (.05) = NS interaction between these two factors. 58 57 These trials are being continued in 2011. 56 Yield (bu/ac) c d 55 ACKNOWLEDGEMENTS 30" Rows 54 Twin Rows Financial support for this project was provided by the 53 Minnesota Corn Growers Association and the 52 Minnesota Soybean Research and Promotion Council. 51 A special thanks to our farmer cooperators Bryon Figure 1: Corn at 38,000 ppa in twin- (a) and 30- 50 Kittleson, Richard Penning, John Penning and Brian 100,000 140,000 180,000 Penning and also to NuWay Coop in Trimont and the inch rows (b) at Wilmont, MN, and soybean at 140,000 ppa in twin- (c) and 30-inch rows (d) at Figure 5: Soybean yield as affected by population Agronomy Center LLC in Adrian for their assistance Welcome, MN in 2010. x row spacing at Wilmont in 2010. with the plots.