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SUMMARY

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eturn to table of contents of this specific evaluation. In five of six site-years, corn yields were greater following soybean than corn. Corn yields were 3 to 11% greater following soybean at S. Charleston and 5% to 13% greater following soybean at Hoytville. Corn yield was not affected by cropping sequence at Hoytville in 2013. At S. Charleston averaged across years, yields following soybean were 10% and 5% greater than those following corn for no-tillage and conventional tillage, respectively. At Hoytville, the yield increase associated with crop rotation was nearly the same (5%) in conventional tillage and no-tillage. Differences among hybrids were observed in three of the six site-years. In 2013, there was no difference in yield among hybrids at S. Charleston, whereas at Hoytville, Pioneer ® P0448AM1 and P1352AMXT brand corn out yielded Pioneer ® P1184AM1 brand corn. In 2014 at S. Charleston, Pioneer ® P1352AMX-R brand corn out yielded Pioneer ® P0210AM-R and P0448AM1 brand corn by 4 to 5%, but no difference in yield occurred between P1184AMX-R and P1352AMX-R and between P0210AM-R and P0448AM1. No differences in yield were present among hybrids at Hoytville in 2014. In 2015, there was no difference in yield among hybrids at S. Charleston, whereas at Hoytville, P0210AMX, P0448AMX, and P1352AMXT out yielded P1184AM1. When examined by drought tolerance designation, an interaction between hybrid type and rotation was observed when averaged across years at each location (Table 1). Table 1. Grain yield from Optimum AQUAmax products and comparative products grown in continuous-corn or corn-soybean cropping sequence. Letters within a column denote similar yield values (P

eturn to table of contents evaluating hybrid responses to plant population and tillage, residue cover in 2014 and 2015 in the conventional tillage continuous corn plots was about 30 to 40% of the coverage in the no-tillage continuous corn plots at S. Charleston and Hoytville. Plant population effects on post-harvest residue were only present at Hoytville in 2013. Plant population affected percent residue cover, but the differences in residue coverage between plant populations did not correspond to changes in plant density. The post-harvest residue cover measurements for 34,000 plants/acre exceeded those of the lower and higher plant densities. Table 2. Tillage, hybrid, and plant population effects on yield (S. Charleston and Hoytville, OH, 2013 to 2015). No differences in plot residue cover were associated with hybrids, although they differed in plant height (P0993HR greater than P0965AM1). Past descriptions of P0965AM1 suggested that this hybrid’s shorter plant stature might result in less plant residue to manage following harvest. Measurements of residue cover biomass collected early in 2014 and 2015 did not detect differences in the quantity of crop residue produced by the two products at high and low plant populations in the conventional and no-till treatment. Outcomes may be expected to differ under less favorable growing conditions and with greater residue accumulation over a longer time period, especially in no-tillage with high plant populations. S. CHARLESTON Treatment 2013 2014 2015 —— (bu/acre) —— TILLAGE No-Tillage 236 209 185 Conventional Till 242 230 184 LSD (0.10) NS 8 NS HYBRID/BRAND P0965AM1 234 220 170 P0993HR 245 219 199 LSD (0.10) NS NS 7 POPULATION (PLANTS/ACRE) 26,000 226 213 184 34,000 243 223 182 42,000 251 222 178 50,000 238 219 192 LSD (0.10) 7 NS 6 HOYTVILLE Treatment 2013 2014 2015 —— (bu/acre) —— TILLAGE No-Tillage 159 159 113 Conventional Till 164 155 118 LSD (0.10) 2 NS NS HYBRID/BRAND P0965AM1 159 220 112 P0993HR 164 219 119 LSD (0.10) NS NS NS POPULATION (PLANTS/ACRE) 26,000 150 157 114 34,000 165 158 131 42,000 170 158 108 50,000 162 151 109 LSD (0.10) 8 NS 13 CONCLUSIONS What Are the Overall Management Implications of the Study? There was no advantage to selecting hybrids based on interaction with the tillage, cropping sequence, and plant population. Drought-tolerant hybrids performed better in different rotations at different locations, but the variation in hybrid performance makes it difficult to produce a specific recommendation. Hybrids with defensive and high-yield designations showed similar responses to tillage and plant population. Corn yields averaged across locations, tillage, and hybrids were about 7% greater following soybean than corn. The yield advantage associated with crop rotation was the same or greater for corn grown using no-tillage than conventional tillage. Residue accumulation was not consistently greater in the no-tillage, continuous corn, and high plant population treatments. CREDITS Research conducted by Peter Thomison, Alex Lindsey, and Allen Geyer; Horticulture and Crop Science Department, The Ohio State University as a part of the DuPont Pioneer Crop Management Research Awards (CMRA) Program. This program provides funds for agronomic and precision farming studies by university and USDA cooperators throughout North America. The awards extend for up to four years and address crop management information needs of DuPont Pioneer agronomists and customers and Pioneer sales professionals. 49

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