The Georgia Agricultural Experiment Stations
College of Agricultural and Environmental Sciences
The University of Georgia
1999 Corn Performance Tests
Research Report #661
November, 1999
J.C. Johnson, Jr., and R.N. Gates
The information presented in the following tables is intended to help producers select corn hybrids that produce large yields of high quality silage. Consistently high yields over several locations and years reliably show a hybrid's ability to produce top yields. Primary quality factors are the proportion of grain and the digestibility of the grain and non-grain portions of the hybrid. Hybrids differ in the proportion of grain they produce.
In the past, it was accepted that a hybrid with the highest proportion of grain made the highest quality silage. Research has shown that, many times, this is not true. In-vitro dry matter digestibility (IVDMD) is a measure of the percentage of a feedstuffs the animal can digest and utilize. IVDMD values for grain are high and do not vary greatly among hybrids. IVDMD values for the non-grain portion (fodder) of the corn plant are lower but much more variable among hybrids compared to the grain portion. Thus, one hybrid with a lower proportion of grain could have high quality (digestibility) because the IVDMD of its fodder portion was much higher than another hybrid having a higher proportion of grain but a much lower IVDMD of its fodder portion.
| Summary of Evaluations of Corn Hybrids for Silage Blairsville, Calhoun, Griffin, and Tifton, Georgia, 1999 |
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| Quality Factors1 | |||||||||||
| IVDMD | Dry Matter Yield | ||||||||||
| Company or Brand Name |
Hybrid No. |
Maturity Class |
Fodder | Grain | Whole Plant2 |
Grain Portion |
Statewide Average* |
Blairsville | Calhoun | Griffin | Tifton |
| --------- % ---------- | % | ------------------ tons/acre ----------------- | |||||||||
| Short and Mid-Season | |||||||||||
| AgriPro | AP 9707 | S | 59.6 | 93.4 | 77.4 | 53 | . | . | . | . | 9.3 |
| AgriPro | AP 9829IMI | S | 56.9 | 93.1 | 75.6 | 52 | . | . | . | . | 10.4 |
| AgriPro | AP 9909 | M | 63.9 | 93.4 | 79.5 | 53 | . | . | . | . | 10.1 |
| AgriPro | AP 9939 | M | 59.2 | 95.3 | 78.3 | 53 | . | . | . | . | 10.6 |
| AgriPro | HS 9843 | S | 57.2 | 93.4 | 76.3 | 53 | . | . | . | . | 8.1 |
| AgriPro | HY 9646 | S | 58.7 | 94.7 | 76.8 | 50 | . | . | . | . | 10.5 |
| Asgrow | RX 897 | S | 58.7 | 94.1 | 76.7 | 51 | . | . | . | 9.2 | 10.2 |
| Asgrow | RX 913 | S | 58.5 | 92.6 | 77.2 | 55 | . | . | . | 8.7 | 10.6 |
| DeKalb | DK 687 | M | 60.9 | 94.4 | 77.7 | 50 | 9.8 | 10.8 | . | 8.1 | 10.6 |
| Garst | 8220 | M | 60.0 | 92.5 | 77.7 | 55 | . | . | . | 7.7 | 9.9 |
| NK | N 83-N5 | M | 61.4 | 93.5 | 78.0 | 52 | . | . | . | . | 10.7 |
| NK | N 83-R7 | M | 63.9 | 93.0 | 78.9 | 51 | . | . | . | . | 10.7 |
| NK | N 8811 | M | 59.7 | 93.4 | 77.5 | 53 | 11.2 | 12.8 | . | 10.3 | 10.6 |
| Pioneer | 3154 | M | 59.6 | 92.6 | 75.7 | 49 | 10.4 | 13.0 | . | 8.8 | 9.4 |
| Pioneer | 3167 | M | 61.7 | 94.0 | 77.4 | 49 | 9.4 | 10.4 | . | 7.8 | 9.9 |
| Pioneer | 31G20 | M | 58.4 | 92.3 | 75.1 | 49 | 12.3 | 15.4 | . | 9.4 | 12.0 |
| Pioneer | 32k61 | S | 59.1 | 94.3 | 76.0 | 48 | 10.0 | 11.7 | . | 8.1 | 10.2 |
| Pioneer | 33J56 | S | 58.5 | 93.5 | 77.3 | 54 | 10.7 | 12.8 | . | 8.3 | 11.0 |
| Southern States | SS849CL | M | 63.1 | 92.0 | 78.3 | 52 | 10.0 | 11.5 | . | 8.6 | 9.8 |
| Southern States | SS859CL | M | 55.2 | 94.2 | 75.6 | 52 | 10.3 | 11.5 | . | 8.7 | 10.7 |
| Southern States | SS897 | M | 60.4 | 94.1 | 78.1 | 52 | 9.1 | 9.8 | . | 8.0 | 9.6 |
| Southern States | SS943 | M | 60.1 | 93.7 | 77.2 | 51 | 9.9 | 12.2 | . | 7.6 | 10.0 |
| Zimmerman | 1851W | S | 62.1 | 93.5 | 76.4 | 45 | . | . | . | . | 11.3 |
| Zimmerman | Z64W | S | 60.0 | 93.6 | 75.4 | 46 | . | . | . | . | 10.5 |
| Average | 59.9 | 93.5 | 77.1 | 51 | 10.3 | 12.0 | . | 8.5 | 10.3 | ||
| LSD at 10% Level | 3.5 | N.S.3 | 1.9 | 2 | - | 1.9 | 1.1 | 1.0 | |||
| Std. Err. of Entry Mean | 1.5 | 1.0 | 1.0 | 1 | - | 0.8 | 0.4 | 0.4 | |||
| Full-Season | |||||||||||
| Greenwood | 830 | F | 50.6 | 86.0 | 66.3 | 44 | . | . | . | . | 10.3 |
| Greenwood | 835 | F | 55.0 | 86.1 | 68.0 | 42 | . | . | . | . | 12.2 |
| Greenwood | 840 | F | 49.5 | 78.4 | 62.2 | 44 | . | . | . | . | 9.9 |
| NK | McNair 508 | F | 52.3 | 86.8 | 67.3 | 44 | . | . | . | . | 10.5 |
| NK | NX 9188 | F | 52.4 | 87.1 | 69.8 | 50 | . | . | . | . | 12.0 |
| Pioneer | 3085 | F | 50.7 | 83.7 | 68.4 | 54 | 9.7 | 10.7 | . | 8.4 | 9.9 |
| Southern States | Exp 79579 | F | 56.1 | 84.1 | 68.9 | 45 | 10.6 | 11.5 | . | 8.8 | 11.4 |
| Southland Genetics | SG1701 | M | 56.3 | 83.5 | 70.5 | 52 | . | . | . | . | 11.3 |
| Southland Genetics | SG1836 | F | 55.2 | 85.4 | 68.5 | 44 | . | . | . | . | 9.5 |
| Southland Genetics | SG1877 | F | 49.3 | 88.3 | 66.2 | 44 | . | . | . | . | 10.7 |
| Southland Genetics | 9006C | F | 54.0 | 86.2 | 68.0 | 43 | . | . | . | . | 10.7 |
| Average | 52.9 | 85.1 | 67.7 | 46 | 10.2 | 11.1 | . | 8.6 | 10.7 | ||
| LSD at 10% Level | 3.4 | N.S. | 3.7 | 4 | - | N.S. | N.S. | 1.2 | |||
| Std. Err. of Entry Mean | 1.4 | 2.4 | 1.5 | 2 | - | 0.8 | 0.4 | 0.5 | |||
| * Tifton, Griffin, and Blairsville. | |||||||||||
| 1. Quality factors taken from the replicated silage trial at Tifton. | |||||||||||
| 2. This variable is calculated to reflect the relative contribution of each component using the following formula: whole plant IVDMD = fodder IVDMD X percent fodder + grain IVDMD X percent grain. | |||||||||||
| 3. The F-test indicated no statistical differences at the alpha = .10 probability level; therefore an LSD value was not calculated. | |||||||||||
| Bolding indicates entries performing equally to highest performing entry within a column based on Fisher's protected LSD (P = 0.10). | |||||||||||
| Tifton,
Georgia: Evaluation of Corn Hybrids for Silage, 1999, Irrigated |
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| Company or Brand Name | Hybrid Name |
Maturity Class |
Forage Yield | Dry Matter |
Grain Portion |
Plant Population |
2-Year Average Dry Forage Yield | |
| Dry | Green | |||||||
| tons/acre | % | % | no. | tons/acre | ||||
| Short and Mid-Season | ||||||||
| Pioneer | 31G20 | M | 12.0 | 23.1 | 52.2 | 49 | 25701 | 12.4 |
| Zimmerman | 1851 | S | 11.3 | 23.7 | 47.6 | 45 | 22869 | . |
| Pioneer | 33J56 | S | 11.0 | 23.6 | 47.1 | 54 | 24612 | . |
| NK | N 83-N5 | M | 10.7 | 21.1 | 50.9 | 52 | 25483 | 11.4 |
| Southern States | SS859CL | M | 10.7 | 21.7 | 49.5 | 52 | 23740 | . |
| NK | N 83-R7 | M | 10.7 | 23.6 | 45.3 | 51 | 23522 | 11.1 |
| Asgrow | RX 913 | S | 10.6 | 20.5 | 51.8 | 55 | 25483 | . |
| DeKalb | DK 687 | M | 10.6 | 25.2 | 42.1 | 50 | 23740 | 11.4 |
| AgriPro | AP 9939 | M | 10.6 | 22.5 | 47.0 | 53 | 23958 | . |
| NK | N 8811 | M | 10.6 | 22.3 | 47.6 | 53 | 24829 | 11.5 |
| AgriPro | HY 9646 | S | 10.5 | 20.1 | 52.2 | 50 | 23740 | . |
| Zimmerman | Z64W | S | 10.5 | 22.9 | 45.7 | 46 | 24394 | . |
| AgriPro | AP 9829IMI | S | 10.4 | 21.6 | 48.4 | 52 | 25483 | . |
| Asgrow | RX 897 | S | 10.2 | 20.7 | 49.3 | 51 | 25047 | . |
| Pioneer | 32k61 | S | 10.2 | 20.7 | 49.5 | 48 | 23740 | . |
| AgriPro | AP 9909 | M | 10.1 | 21.7 | 46.6 | 53 | 24176 | . |
| Southern States | SS943 | M | 10.0 | 21.7 | 46.1 | 51 | 24176 | . |
| Garst | 8220 | M | 9.9 | 21.9 | 45.2 | 55 | 23523 | . |
| Pioneer | 3167 | M | 9.9 | 23.7 | 42.0 | 49 | 24394 | . |
| Southern States | SS849CL | M | 9.8 | 21.8 | 45.1 | 52 | 23522 | . |
| Southern States | SS897 | M | 9.6 | 21.8 | 44.2 | 52 | 23740 | . |
| Pioneer | 3154 | M | 9.4 | 18.9 | 49.9 | 49 | 23740 | 10.2 |
| AgriPro | AP 9707 | S | 9.3 | 21.8 | 42.9 | 53 | 24612 | . |
| AgriPro | HS 9843 | S | 8.1 | 16.9 | 48.0 | 53 | 23740 | . |
| Average | 10.31 | 21.8 | 47.3 | 51 | 24248 | 11.3 | ||
| LSD at 10% Level | 1.0 | 2.6 | 3.3 | 2 | 1403 | 0.8 | ||
| Std. Err. of Entry Mean | 0.4 | 1.1 | 1.4 | 1 | 595 | 0.3 | ||
| Full-Season | ||||||||
| Greenwood | 835 | F | 12.2 | 29.7 | 41.1 | 42 | 25047 | 12.4 |
| NK | NX 9188 | F | 12.0 | 26.1 | 45.9 | 50 | 24612 | . |
| Southern States | Exp 79579 | F | 11.4 | 26.0 | 43.8 | 45 | 24611 | . |
| Southland Genetics | SG1701 | M | 11.3 | 23.6 | 48.3 | 52 | 24176 | . |
| Southland Genetics | SG1877 | F | 10.7 | 27.2 | 39.3 | 44 | 21345 | 10.9 |
| Southland Genetics | 9006C | F | 10.7 | 24.3 | 43.9 | 43 | 25700 | 12.6 |
| NK | McNair 508 | F | 10.5 | 24.4 | 43.2 | 44 | 24612 | 10.4 |
| Greenwood | 830 | F | 10.3 | 24.5 | 41.9 | 44 | 23522 | 11.1 |
| Greenwood | 840 | F | 9.9 | 26.0 | 38.0 | 44 | 22216 | 10.9 |
| Pioneer | 3085 | F | 9.9 | 25.4 | 39.1 | 54 | 24612 | 11.0 |
| Southland Genetics | SG1836 | F | 9.5 | 24.7 | 38.3 | 44 | 24611 | 9.6 |
| Average | 10.72 | 25.6 | 42.1 | 46 | 24097 | 11.1 | ||
| LSD at 10% Level | 1.2 | N.S.3 | 3.3 | 4 | 2180 | N.S. | ||
| Std. Err. of Entry Mean | 0.5 | 1.4 | 1.4 | 2 | 908 | 0.4 | ||
| 1. CV = 8.7%, and df for EMS = 68. | ||||||||
| 2. CV = 9.4%, and df for EMS = 30. | ||||||||
| 3. The F-test indicated no statistical differences at the alpha = .10 probability level; therefore an LSD value was not calculated. | ||||||||
| Bolding indicates entries yielding equal to highest yielding entry within a column based on Fisher's protected LSD (P = 0.10). | ||||||||
| Planted: | March 18, 1999. | |||||||
| Harvested: | July 23, 1999. | |||||||
| Seeding Rate: | 26,000 seeds/acre in 30" rows. | |||||||
| Soil Type: | Tifton loamy sand. | |||||||
| Soil Test: | P = High, K = Medium, and pH = 6.0. | |||||||
| Fertilization: | 116 lb N, 130 lb P2O5, and 195 lb K2O/acre as preplant; 185 lb N and 31lb S/acre as sidedress. | |||||||
| Previous Crop: | Soybean. | |||||||
| Management: | Moldboard plowed and rototilled; Sutan, Accent, Permit, and one cultivation used for weed control; Lorsban used for insect control; irrigated 6 inches. | |||||||
| Test conducted by A. E. Coy and M. D. Pippin. | ||||||||
| Griffin, Georgia: Evaluation of Corn Hybrids for Silage, 1999, Irrigated |
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| Company or Brand Name | Hybrid Name |
Maturity Class |
Forage Yield | Dry Matter |
Grain Portion |
Plant Population |
2-Year Average Dry Forage Yield | |
| Dry | Green | |||||||
| tons/acre | % | % | no. | tons/acre | ||||
| NK | N 8811 | M | 10.3 | 21.3 | 48.4 | 47 | 25168 | 9.2 |
| Pioneer | 31G20 | M | 9.4 | 15.9 | 59.1 | 49 | 28798 | 8.7 |
| Asgrow | RX 897 | S | 9.2 | 16.4 | 56.0 | 47 | 27830 | . |
| Pioneer | 3154 | M | 8.8 | 14.2 | 61.8 | 52 | 25410 | 8.6 |
| Southern States | Exp 79579 | F | 8.8 | 18.1 | 48.6 | 51 | 27830 | . |
| Asgrow | RX 913 | S | 8.7 | 16.7 | 51.9 | 50 | 25894 | . |
| Southern States | SS859CL | M | 8.7 | 15.8 | 55.0 | 51 | 22748 | . |
| Southern States | SS849CL | M | 8.6 | 16.4 | 52.5 | 53 | 26620 | . |
| Pioneer | 3085 | F | 8.4 | 18.9 | 44.8 | 52 | 26136 | 8.3 |
| Pioneer | 33J56 | S | 8.3 | 14.7 | 56.0 | 49 | 24926 | . |
| Pioneer | 32k61 | S | 8.1 | 14.0 | 58.6 | 47 | 25652 | . |
| DeKalb | DK 687 | M | 8.1 | 15.0 | 53.7 | 47 | 26378 | . |
| Southern States | SS897 | M | 8.0 | 16.1 | 49.7 | 50 | 27588 | . |
| Pioneer | 3167 | M | 7.8 | 14.8 | 52.5 | 51 | 25894 | . |
| Garst | 8220 | M | 7.7 | 14.4 | 53.5 | 53 | 26862 | . |
| Southern States | SS943 | M | 7.6 | 14.6 | 52.2 | 51 | 24200 | . |
| Average | 8.51 | 16.1 | 53.4 | 50 | 26121 | 8.7 | ||
| LSD at 10% Level | 1.1 | 1.8 | 3.8 | 3 | N.S.2 | N.S. | ||
| Std. Err. of Entry Mean | 0.4 | 0.8 | 0.6 | 1 | 1662 | 0.2 | ||
| 1. CV = 10.6%, and df for EMS = 45. | ||||||||
| 2. The F-test indicated no statistical differences at the alpha = .10 probability level; therefore an LSD value was not calculated. | ||||||||
| Bolding indicates entries yielding equal to highest yielding entry within a column based on Fisher's protected LSD (P = 0.10). | ||||||||
| Planted: | April 8, 1999. | |||||||
| Harvested: | September 1, 1999. | |||||||
| Seeding Rate: | 31,000 seeds/acre in 30" rows. | |||||||
| Soil Type: | Appling coarse sandy loam. | |||||||
| Soil Test: | P = Medium, K = High, and pH = 6.7. | |||||||
| Fertilization: | 49 lb N, 98 lb P2O5, and 147 lb K2O/acre as preplant; 200 lb N/acre as sidedress. | |||||||
| Previous Crop: | Soybean. | |||||||
| Management: | Moldboard plowed and rototilled; Aatrex and Lasso used for weed control; irrigated 9 inches. | |||||||
| Test conducted by J. L. Day and P. A. Rose. | ||||||||
Calhoun, Georgia:
Evaluation of Corn Hybrids for Silage, 1999, Irrigated
A corn hybrid for silage performance trial was conducted at this location during the 1999 growing season. However, high wind and rain caused considerable lodging and variation in performance among plots within the test. Since this data could potentially be misleading if used in making decisions concerning hybrid selection, we have chosen not to present them in this publication.
| Blairsville, Georgia: Evaluation of Corn Hybrids for Silage, 1999, Nonirrigated |
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| Company or Brand Name | Hybrid Name |
Maturity Class |
Forage Yield | Dry Matter |
Grain Portion |
Plant Population |
2-Year Average Dry Forage Yield | |
| Dry | Green | |||||||
| tons/acre | % | % | no. | tons/acre | ||||
| Pioneer | 31G20 | M | 15.4 | 29.5 | 52.1 | 48 | 26606 | 13.5 |
| Pioneer | 3154 | M | 13.0 | 25.0 | 51.8 | 50 | 25155 | 12.4 |
| Pioneer | 33J56 | S | 12.8 | 25.7 | 50.0 | 55 | 27090 | . |
| NK | N 8811 | M | 12.8 | 29.5 | 43.3 | 49 | 26606 | 12.2 |
| Southern States | SS943 | M | 12.2 | 23.8 | 51.1 | 53 | 28058 | . |
| Pioneer | 32k61 | S | 11.7 | 22.3 | 52.2 | 49 | 26123 | . |
| Southern States | Exp 79579 | F | 11.5 | 19.4 | 59.4 | 44 | 26606 | . |
| Southern States | SS849CL | M | 11.5 | 22.7 | 50.4 | 52 | 25155 | . |
| Southern States | SS859CL | M | 11.5 | 22.6 | 50.8 | 51 | 24188 | . |
| DeKalb | DK 687 | M | 10.8 | 23.4 | 46.0 | 46 | 24671 | . |
| Pioneer | 3085 | F | 10.7 | 24.1 | 44.5 | 52 | 24671 | 10.4 |
| Pioneer | 3167 | M | 10.4 | 23.6 | 44.1 | 50 | 28541 | . |
| Southern States | SS897 | M | 9.8 | 21.5 | 46.0 | 52 | 24671 | . |
| Average | 11.81 | 24.1 | 49.4 | 50 | 26011 | 12.1 | ||
| LSD at 10% Level | 1.9 | 3.2 | 4.1 | 4 | N.S.2 | 1.6 | ||
| Std. Err. of Entry Mean | 0.8 | 1.4 | 1.7 | 2 | 1759 | 0.7 | ||
| 1. CV = 13.4%, and df for EMS = 36. | ||||||||
| 2. The F-test indicated no statistical differences at the alpha = .10 probability level; therefore an LSD value was not calculated. | ||||||||
| Bolding indicates entries yielding equal to highest yielding entry within a column based on Fisher's protected LSD (P = 0.10). | ||||||||
| Planted: | May 11, 1999 | |||||||
| Harvested: | October 15, 1999 | |||||||
| Seeding Rate: | 28,600 plants/acre in 30" rows | |||||||
| Soil Type: | Bradson clay loam | |||||||
| Soil Test: | P = High, K = Medium, and pH = 6.3 | |||||||
| Fertilization: | 30 lb N, 60 lb P2O5, and 90 lb K2O/acre as preplant; 125 lb N/acre as sidedress. | |||||||
| Previous Crop: | Soybean | |||||||
| Management: | Moldboard plowed and disked; Aatrex, Bicep, and one cultivation used for weed control. | |||||||
| Test conducted by P. A. Rose, J. L. Day, and H. D. Garrett. | ||||||||
| Quincy,
Florida: Evaluation of Corn Hybrids for Silage, 1999, Irrigated |
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| Company or Brand Name |
Hybrid Name |
Maturity Class |
Forage Yield (35% moisture) |
Dry Matter |
Grain Portion |
Plant Population |
2-Year Average Dry Forage Yield |
| tons/acre | % | % | no. | tons/acre | |||
| Short and Mid-Season | |||||||
| Pioneer | 32k61 | S | 22.8 | . | . | . | . |
| Southern States | SS859CL | M | 22.5 | . | . | . | . |
| NK | N 83-N5 | M | 22.0 | . | . | . | . |
| Pioneer | 3223 | S | 21.4 | . | . | . | . |
| NK | N 83-R7 | M | 21.3 | . | . | . | . |
| NK | N 8811 | M | 21.2 | . | . | . | . |
| AgriPro | AP 9707 | S | 20.7 | . | . | . | . |
| DeKalb | DK 687 | M | 20.6 | . | . | . | . |
| Pioneer | 31G20 | M | 20.6 | . | . | . | . |
| Pioneer | 33J56 | S | 20.4 | . | . | . | . |
| AgriPro | AP 9909 | M | 20.0 | . | . | . | . |
| Asgrow | RX 913 | S | 20.0 | . | . | . | . |
| Zimmerman | 1851W | S | 20.0 | . | . | . | . |
| AgriPro | HS 9843 | S | 19.9 | . | . | . | . |
| AgriPro | AP 9939 | M | 19.8 | . | . | . | . |
| NK | N73-N8 | S | 19.6 | . | . | . | . |
| AgriPro | AP 9829IMI | S | 19.6 | . | . | . | . |
| AgriPro | HY 9646 | S | 19.4 | . | . | . | . |
| Funk's G | 5088 | S | 19.4 | . | . | . | . |
| Zimmerman | Z64W | S | 19.4 | . | . | . | . |
| Southern States | SS849CL | M | 19.2 | . | . | . | . |
| Funk's G | X5583 | M | 19.1 | . | . | . | . |
| Pioneer | 3154 | M | 18.9 | . | . | . | . |
| Pioneer | 3167 | M | 18.8 | . | . | . | . |
| Southern States | SS943 | M | 18.8 | . | . | . | . |
| Pioneer | 3245 | S | 18.3 | . | . | . | . |
| Garst | 8220 | M | 18.3 | . | . | . | . |
| Funk's G | 5516 | S | 18.1 | . | . | . | . |
| Asgrow | RX 897 | S | 18.0 | . | . | . | . |
| Pioneer | 3146 | M | 18.0 | . | . | . | . |
| Pioneer | 3098 | M | 17.9 | . | . | . | . |
| Southern States | SS897 | M | 17.8 | . | . | . | . |
| Funk's G | 4581 | S | 16.8 | . | . | . | . |
| Pioneer | 3163 | M | 16.5 | . | . | . | . |
| NK | N79-P4 | S | 16.2 | . | . | . | . |
| Average | 19.51 | . | |||||