1. 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

2. 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.

3. 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

4. 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

5. 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 (112 day)
DKC (118 day)
D 56VC46 (116 day)
NK 1405 (114 day)

6. 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 (112 day)
162.2 (19,830)
180.6 (22,160)
DKC (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)

7. 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 (112 day)
185.0 (27,540)
216.0 (28,530)
DKC (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)

8. 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.

9. 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 (112 day)
106.8
116.9
DKC (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

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

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

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