Barnhill, J. V.

Cartee, R. L.

Griggs, T. C.

Knudsen, D. D.

Pace, M. G.

Sessions, R. F.

English

DigitalCommons@USU

 November 2004 (pr)                AG/Crop Trials/2004-01   Silage Corn Performance, 2001; Cache, Davis, and Millard Counties, Utah  T.C. Griggs1, J.V. Barnhill2, M.G. Pace2, R.F. Sessions2, R.L. Cartee1,3, and D.D. Knudsen3 1Dept. of Plants, Soils, & Biometeorology, 2USU Extension, and 3Utah Agricultural Experiment Station   This report summarizes performance of irrigated silage corn hybrids on farms in Cache, Davis, and Millard counties in 2001. Sites were at 4236-4600 ft elevation and had long-term averages of 2696-3423 corn growing degree days (GDD, 50/86° F) per year (Tables 1-3). Hybrids from breeding programs and seed marketers were seeded with farm planters on May 4-14 at target rates of 32,000-34,000 seeds/ac. Furrow-irrigated plots were three-to-six rows wide at 30-in row spacing by 1200 ft long in three randomized complete blocks. Nutrient and pesticide applications and previous crops are indicated in Tables 1-3. Soil fertility levels were within recommended ranges except for marginally low P (12 ppm) at Delta. Plots at Delta were injured and regrew from high winds and frosts of 27-28º F during two nights in mid-June.  Hybrids had relative maturity (RM) ratings of 103-124 days and included some with Roundup Ready® and leafy (N48-V8) traits. Plots were harvested with silage choppers on September 13-October 5 to target whole-plant moisture concentrations of 65-70%. Weights were obtained with trucks and commercial scales. Sample dry matter (DM) concentration was determined at 105º C (221º F). Plot weights were expressed as tons/ac of oven-dry and 70%-moisture silage.  Hybrids ranked in decreasing order of forage production (Tables 1-3) may be compared in terms of the least significant difference (LSD). This is the minimum difference required between entries in a column for significance at a given level of confidence. Values of LSD are shown for 5 and 30% probabilities that observed differences among entries are merely due to chance, rather than to variety effects. For example, in Table 2, DM yields of the top two hybrids are not different at the 5% probability level, because they vary by less than the LSD of 0.29 ton/ac. Yields of the remaining hybrids are different from the first hybrid at the 5% level because they vary by at least the LSD. At 30% probability that yield variations are due to chance, smaller differences become significant. The coefficient of variation (CV) describes variability among replications of the same hybrid; values below 10% suggest good precision for detecting entry differences.   Forage production at 70% moisture differed by 3.3-5.9 tons/ac among hybrids, depending on location. Yields at Delta reflected frost injury and leaf loss in June. Differences were not strongly associated with varying population densities and RM ratings. Hybrids with longer RM ratings tended to be wettest at harvest. In a few cases, harvest moisture concentrations exceeded 70%, which can lead to energy loss via seepage of soluble dry matter and impaired silage fermentation. Moisture concentrations were drier than 60-65% in a few cases, which can also impair silage fermentation. Excessive moisture at harvest can be avoided by selecting hybrids that perform well at shorter RM ratings and permit adequate grain filling and field drying prior to harvest.    Table 1. 2001 silage corn performance at Wellsville (Cache Co.), UT (USU Caine Dairy). Planted May 14, harvested Oct. 5. Elevation 4490 ft, 2696 corn GDD, Greenson loam. Applications: 100 lb N/ac; Dual Magnum® herbicide; and Lorsban™ granular insecticide at planting. Previous crop: corn.   Relative Population Silage Silage yield Brand Hybrid maturity density moisture DM (105 C) 70% moist.   days plants/ac % fresh wt. ton/ac HYTEST HT7815 117 33522 71.8 7.35 24.49 Asgrow RX634 107 32858 65.8 6.76 22.53 HYTEST HT7747RR 113 28543 66.7 6.60 22.01 DEKALB DKC61-25 111 32692 68.6 6.53 21.77 DEKALB DKC63-03 113 35347 65.1 6.33 21.11 Asgrow RX508 103 34683 64.1 5.91 19.69 NK N48-V8 107 32692 69.6 5.79 19.31 DEKALB DK626 112 28045 67.2 5.59 18.62 Mean  110 32298 67.4 6.36 21.19 Significance of F test (P)  <0.01 <0.01 0.08 0.08 LSD (0.05)   2918 2.0 1.14 3.78 LSD (0.30)   1464 1.0 0.57 1.90 CV (%)    5.2 1.7 10.2 10.2            Table 2. 2001 silage corn performance south of Hooper (Davis Co.), UT (Kurt Fowers). Planted May 4, harvested Sept. 13. Elevation 4236 ft, 3300 corn GDD, Warm Springs fine sandy loam. Applications: 177 lb N/ac; Frontier® herbicide; and Isotox® Seed Treater F. Previous crop: corn.   Relative Population Silage Silage yield Brand Hybrid maturity density moisture DM (105 C) 70% moist.   days plants/ac % fresh wt. ton/ac DEKALB DK679 117 26950 74.0 8.70 29.00 Asgrow RX897 118 30767 75.1 8.59 28.62 Croplan Genetics TR1167 116 26851 73.7 8.38 27.93 DEKALB DK743 124 29772 75.6 8.20 27.32 DEKALB DK697 119 31332 71.3 8.18 27.24 Asgrow RX740RR 111 31763 73.7 7.87 26.22 NK N48-V8 107 31265 67.6 7.72 25.71 Mean  116 29814 73.0 8.23 27.44 Significance of F test (P)  0.01 <0.01 <0.01 <0.01 LSD (0.05)   3001 2.0 0.29 0.97 LSD (0.30)   1491 1.0 0.14 0.48 CV (%)   5.7 1.5 2.0 2.0     Table 3. 2001 silage corn performance at Delta (Millard Co.), UT (Rick Smith). Planted May 8, harvested Sept. 25. Elevation 4600 ft, 3423 corn GDD, Abbott silty clay, and Anco and Poganeab silty clay loams. Applications: 150 lb N and 50 lb P2O5/ac; and Banvel® and 2,4-D herbicides. Previous crop: alfalfa.   Relative Population Silage Silage yield Brand Hybrid maturity density moisture DM (105 C) 70% moist.   days plants/ac % fresh wt. ton/ac Pioneer 32P75 116 32128 59.3 6.80 22.65 NK N48-V8 107 31165 52.3 6.76 22.54 HYTEST HT7815 117 29571 67.4 6.59 21.97 Croplan Genetics TR1167 116 26652 65.3 6.57 21.91 Monsanto TXP165A-D (RR)a 116 27382 57.5 6.18 20.59 Grand Valley SX2298RR 113 25258 58.6 6.06 20.21 Asgrow RX738RR 111 31099 56.9 6.01 20.04 Asgrow RX740RR 111 31962 60.6 5.84 19.48 HYTEST HT7747RR 113 26552 61.3 5.77 19.25 Monsanto TXP164A-D (RR)b 115 28211 63.3 5.57 18.56 Mean  114 28961 60.0 6.23 20.75 Significance of F test (P)  0.02 <0.01 0.41c 0.42 LSD (0.05)   4202 4.4 NSc NS LSD (0.30)   2129 2.2 NS NS CV (%)   8.3 4.2 11.4 11.5 aTXP165A-D (RR) was commercialized to DKC66-00(RR). bTXP164A-D (RR) was commercialized to DKC65-00(RR). cNo significant differences among hybrids.           Utah State University is committed to providing an environment free from harassment and other forms of illegal discrimination based on race, color, religion, sex, national origin, age (40 and older), disability, and veteran’s status. USU’s policy also prohibits discrimination on the basis of sexual orientation in employment and academic related practices and decisions.  Utah State University employees and students cannot, because of race, color, religion, sex, national origin, age, disability, or veteran’s status, refuse to hire; discharge; promote; demote; terminate; discriminate in compensation; or discriminate regarding terms, privileges, or conditions of employment, against any person otherwise qualified. Employees and students also cannot discriminate in the classroom, residence halls, or in on/off campus, USU-sponsored events and activities.  This publication is issued in furtherance of Cooperative Extension work. Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Noelle Cockett, Vice President for Extension and Agriculture, Utah State University.  

Silage Corn Performance, 2001; Cache, Davis, and Millard Counties, Utah

https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2745&amp;context=extension_curall

Silage Corn Performance, 2001; Cache, Davis, and Millard Counties, Utah

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