Table 2. The characteristics of the experimental sites and field operations at Florence, SC, USA and Pendleton, SC, USA.
| Characteristics | Florence, SC | Pendleton, SC |
|---|---|---|
| Soil type | Norfolk sandy loam (fine-loamy, siliceous, thermic Typic Kandiudults) | Cecil sandy loam (clayey, kaolinitic, thermic Typic Hapludults) |
| Previous crops for the experimental site | Corn in 2016 and soybean in 2015 | Sorghum in 2016 and soybean in 2015 |
| Tillage | Primary tillage using a disk plow one week before planting | Primary tillage using a disk plow two weeks before planting |
| Fertilizer application | 1. 0-0-60 (N-P-KCl) at the rate of 219 kg ha-1 2. Dolomitic lime (CaMg(CO3)2) at the rate of 764 kg ha-1 |
1. 7-24-29 (N-P2O5-K2O) at the rate of 448 kg ha-1 |
| Pre-emergent herbicide application | 1. Valor (2-[7-fluoro-3,4-dihydro-3-oxo-4-(2-propynyl)- 2H-1,4-benzoxazin-6-yl]-4,5,6,7-tetrahydro-1H- isoindole-1,3(2H)-dione) (Valent USA, Snellville, GA) at the rate of 0.22 L ha–1 2. Roundup (Glyphosate, N-(phosphonomethyl)glycine) (Monsanto, St. Louis, MO) at the rate of 2.34 L ha–1 |
1. Boundary (S-Metolachlor and Metribuzin) (Syngenta, Basil, Switzerland) at the rate of 1.75 L ha–1 2. Prowl H2O (N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine) (BASF Ag Products, Research Triangle Park, NC) at the rate of 2.33 L ha–1 |
| Post-emergent herbicide application | 1. Anthem Maxx (Pyroxasulfone) (FMC Agricultural Solutions, Philadelphia, PA) at the rate of 0.58 L ha–1 2. Marvel (Fluthiacet methyl and Fomesafen) (FMC Agricultural Solutions, Philadelphia, PA) at the rate of 0.44 L ha–1. |
1. Dawn (5-[2-chloro-4-(trifluoromethyl)phenoxy]-N-(methylsulfonyl)-2-nitrobenzamide) (Cheminova, Research Triangle Park, NC) at the rate of 4.68 L ha–1 |
| Plot size† | 6.1 m by 3.0 m | 6.1 m by 3.0 m |
| Planting date | 9 June 2017 | 8 June 2017 |
| Planting depth | 4 cm | 4 cm |
| Type of planter | 4-row dynamic disc planter (Wintersteiger, Salt Lake City, UT) | 4-row cone planter (Almaco, Nevada, IA) |
| Row direction | North-south | North-south |
| Seeding rate | 135,000 seeds ha–1 | 135,000 seeds ha–1 |
| Row spacing | 76.2 cm | 76.2 cm |
| Irrigation | 25.4 mm water applied at 35, 56, 69, 76, and 83 days after planting using a fixed-solid set sprinkler system | 25.4 mm water applied at 102 days after planting using a travelling gun sprinkler system |
† All genotypes were sown in plots of 6.1 m by 3.0 m size in both locations