SCC-33 National Crop Variety Testing Group Evaluation of drought-tolerant corn hybrids on alluvial and loessial soils in northeast louisiana SCC-33 National Crop Variety Testing Group Key Largo, FL – February 3-5, 2019 Rick Mascagni - Northeast Research Station

objectives 1) Determine the yield performance of DT corn hybrids compared to standard commercial hybrids under different soil moisture regimes on alluvial and loessial soils in northeast Louisiana. 2) Determine the influence of plant population on yield performance of selected DT corn hybrids.

PROCEDURES Northeast Research Station (NERS), St. Joseph, LA Sharkey clay (Alluvial soil) Randomized Complete Block Expt. Planting date: Apr 13, 2018 (Cone planter) Irrigated (5/22, 6/1, 6/8, 6/15, 6/28, and 7/5) and non-irrigated trials 10 hybrids Two seeding rates Commerce silt loam Planting date: Apr 13, 2019 (JD 1700 planter) Two hybrids Three irrigations

PROCEDURES Macon Ridge Research Station (MRRS), Winnsboro, LA Gigger silt loam (Loessial soil) Planting date: Apr 6, 2018 (Cone planter) Irrigated 10 hybrids Two seeding rates

Table 1. Hybrids evaluated on Sharkey clay at St Table 1. Hybrids evaluated on Sharkey clay at St. Joseph and Gigger silt loam at Winnsboro, la, 2018. Hybrids Drought-Tolerant Hybrids D 54DC94 (114 day) G 4678 (114 day) Mex 1548 (115 day) NK 1103A (111 day) Std. Hybrids, Stress Tolerant D 57VC51 (117 day) NK 1694 (116 day) Std. Hybrids, Good Yield Stability DKC 62-08 (112 day) DKC 68-26 (118 day) D 56VC46 (116 day) NK 1405 (114 day)

Grain yield, bu/acre (plants/acre) Table 2. Influence of hybrid on corn grain yield at the 24,000 seed/acre seeding rate on Sharkey clay at st. joseph, 2018. Hybrid Non-Irrigated Irrigated Grain yield, bu/acre (plants/acre) Drought-Tolerant Hybrids D 54DC94 (114 day) 166.7 (20,280) 181.1 (21,090) G 4678 (114 day) 163.2 (19,640) 191.1 (21,620) Mex 1548 (115 day) 175.1 (21,260) 192.4 (23,060) NK 1103A (111 day) 164.8 (21,800) 188.0 (23,400) Std. Hybrids, Stress Tolerant D 57VC51 (117 day) 163.0 (19,620) 189.3 (20,770) NK 1694 (116 day) 171.9 (20,450) 197.5 (22,760) Std. Hybrids, Good Yield Stability DKC 62-08 (112 day) 162.2 (19,830) 180.6 (22,160) DKC 68-26 (118 day) 161.9 (20,850) 188.6 (22,220) D 56VC46 (116 day) 167.3 (20,190) 188.2 (22,040) NK 1405 (114 day) 158.3 (20,450) 190.3 (23,390) Average 165.4 (20,440) 188.7 (22,250)

Grain yield, bu/acre (plants/acre) Table 3. Influence of hybrid on corn grain yield at the 34,000 seed/acre seeding rate on Sharkey clay at st. joseph, 2018. Hybrid Non-Irrigated Irrigated Grain yield, bu/acre (plants/acre) Drought-Tolerant Hybrids D 54DC94 (114 day) 193.9 (27,810) 219.6 (27,620) G 4678 (114 day) 189.6 (28,410) 218.6 (28,030) Mex 1548 (115 day) 203.5 (29,530) 223.5 (29,290) NK 1103A (111 day) 175.7 (29,350) 206.4 (29,740) Std. Hybrids, Stress Tolerant D 57VC51 (117 day) 198.5 (26,840) 215.9 (28,470) NK 1694 (116 day) 196.8 (28,750) 226.2 (29,620) Std. Hybrids, Good Yield Stability DKC 62-08 (112 day) 185.0 (27,540) 216.0 (28,530) DKC 68-26 (118 day) 184.3 (29,410) 226.5 (30,670) D 56VC46 (116 day) 194.6 (29,150) 221.7 (29,240) NK 1405 (114 day) 184.7 (29,920) 214.2 (29,310) Average 190.7 (28,670) 218.9 (29,050)

Fig. 1. Influence of irrigation and seeding rate on grain yield for 24,000 seed/acre Grain yield, bu/acre Management Fig. 1. Influence of irrigation and seeding rate on grain yield for drought-tolerant hybrids (DT), standard hybrids with stress tolerance, and standard hybrids with good yield stability on Sharkey clay at St. Joseph, 2018.

Grain yield, bu/acre (plants/acre) Table 4. Influence of hybrid on corn grain yield at 24,000 and 34,000 seed/acre seeding rates on GIGGER SILT LOAM AT WINNSBORO, 2018. Hybrid 24,000 seed/acre 34,000 seed/acre Grain yield, bu/acre (plants/acre) Drought-Tolerant Hybrids D 54DC94 (114 day) 108.5 127.4 G 4678 (114 day) 105.9 129.1 Mex 1548 (115 day) 110.7 145.6 NK 1103A (111 day) 103.6 120.8 Std. Hybrids, Stress Tolerant D 57VC51 (117 day) 112.4 115.3 NK 1694 (116 day) 102.7 131.1 Std. Hybrids, Good Yield Stability DKC 62-08 (112 day) 106.8 116.9 DKC 68-26 (118 day) 122.8 122.0 D 56VC46 (116 day) 117.8 135.8 NK 1405 (114 day) 113.8 Average 110.5 125.8

Fig. 2. Influence of seeding rate on grain yield for drought-tolerant Grain yield, bu/acre Management Fig. 2. Influence of seeding rate on grain yield for drought-tolerant hybrids (DT), standard hybrids with stress tolerance, and standard hybrids with good yield stability on Gigger silt loam at St. Joseph, 2018.

Fig. 3. Influence of irrigation and seeding rate on seed weight for 24,000 seed/acre Seed weight, g/100 seed Management Fig. 3. Influence of irrigation and seeding rate on seed weight for drought-tolerant hybrids (DT), standard hybrids with stress tolerance, and standard hybrids with good yield stability on Sharkey clay at St. Joseph, 2018.

and standard hybrids with good yield stability on Sharkey clay at 24,000 seed/acre Kernels, no./ear Management Fig. 4. Influence of irrigation and seeding rate on ear size (kernels/ear) for drought-tolerant hybrids (DT), standard hybrids with stress tolerance, and standard hybrids with good yield stability on Sharkey clay at St. Joseph, 2018.

Fig. 5. Influence of irrigation and seeding rate on grain yield for Par Irr – 6/1, 6/5, 6/9, and 6/27 Fully Irr – 6/1, 6/5, 6/9, 6/18, and 6/27 20,000 seed/acre Grain yield, bu/acre Management Fig. 5. Influence of irrigation and seeding rate on grain yield for drought-tolerant hybrid (G 4678) and standard hybrid with good yield stability (DKC 62-08) on Commerce silt loam at St. Joseph, 2018.

Summary Preliminary grain yield data suggest that DT hybrids may be adapted in north Louisiana. DT hybrids performed well under both non-irrigated and irrigated conditions. More DT hybrids will be evaluated in 2019, including lines from Dr. Xu at Texas A&M. More information is needed under different soil moisture regimes.

Summary hmascagni@agcenter.lsu.edu It’s a challenge to obtain seed for DT hybrids in our study. hmascagni@agcenter.lsu.edu

FUNDING: LOUISIANA SOYBEAN AND GRAIN PROMOTION BOARD ThankS FOR YOUR ATTENTIVENESS Questions??