N.E. Christians and R.A. St. John
This is the fifth year of data from the green height bentgrass trial established in the fall of 1998. The area is maintained at a 3/16-inch mowing height. This is a National Turfgrass Evaluation Program (NTEP) trial and is being conducted at several research stations in the U.S. It contains 29 seeded cultivars, including a number of experimentals. Most of the plots are creeping bentgrass , but two, Pick MVB and Bavaria, are velvet bentgrasses.
The cultivars are maintained with a fertilizer program of 1/4 lb N applied at 14-day intervals with a total of 4 lbs of N/1000 ft2/growing season. Fungicides are used as needed in a preventative program. Herbicides and insecticides are applied as needed.
The visual quality was evaluated monthly in 2002 from May through October (Table 1). The values listed under each month in Table 1 are the averages of visual quality ratings made on three replicated plots. Visual quality was based on a scale of 9 to 1: 9 = best quality, 6 = lowest acceptable quality, and 1 = worst quality. The yearly average of the monthly data for each cultivar was calculated and is listed in the last column (Mean). The first cultivar listed in Table 1 had the highest average visual quality rating for the entire 2002 season. The cultivars are listed in descending order by average quality. The last row states the LSD (least significant difference), which is a statistical measurement of how widely the datum in each column must vary before they are considered to be different from one another.
Data for spring greenup (Greenup) and for genetic color (Gencolor) were also collected in April 2002 and June 2002, respectively. Spring greenup data were estimated using a 9 to 1 scale with 9 = green and 1 = dormant turf. Genetic color was rated using a 9 to 1 scale with 9 = dark and 1 = light green. This trial will be replaced with a new green height bentgrass trial in 2003.
Table 1. The 2002 visual ratings for cultivars in the 1998 Green Height Bentgrass Trial.
| --------------------------------Quality-------------------------------- | |||||||||
| Bentgrass Cultivar | GREENUP | GENCOLOR | MAY | JUN | JUL | AUG | SEP | OCT | MEAN |
|---|---|---|---|---|---|---|---|---|---|
| ---------------------------------------------------9-1; 9 Best------------------------------------------------- | |||||||||
| CENTURY | 6.7 | 6.3 | 6.0 | 7.0 | 8.0 | 8.3 | 7.7 | 7.7 | 7.4 |
| IMPERIAL | 7.0 | 6.7 | 5.3 | 7.0 | 8.0 | 8.3 | 6.3 | 8.0 | 7.2 |
| PENN G-6 | 6.7 | 6.3 | 6.0 | 6.7 | 7.0 | 8.0 | 8.0 | 7.7 | 7.2 |
| BENGAL (BAR AS 8FUS2) | 7.0 | 7.7 | 6.0 | 7.7 | 6.7 | 8.0 | 6.7 | 7.7 | 7.1 |
| L-93 | 7.7 | 5.7 | 6.3 | 7.7 | 7.3 | 7.0 | 7.0 | 7.3 | 7.1 |
| CRENSHAW | 7.3 | 6.7 | 6.0 | 7.3 | 6.7 | 7.3 | 7.0 | 7.7 | 7.0 |
| ABT-CRB-1 | 6.3 | 6.7 | 5.7 | 6.3 | 7.0 | 8.0 | 6.7 | 8.0 | 6.9 |
| PENN A-1 | 6.3 | 7.3 | 4.7 | 6.0 | 7.0 | 8.3 | 7.3 | 8.3 | 6.9 |
| PENN A-2 | 7.0 | 6.3 | 5.7 | 7.0 | 6.3 | 8.3 | 6.3 | 8.0 | 6.9 |
| PENN A-4 | 7.0 | 6.0 | 5.3 | 6.3 | 7.7 | 8.3 | 7.0 | 7.0 | 6.9 |
| SYN 96-1 | 7.3 | 7.0 | 5.7 | 7.7 | 7.0 | 7.3 | 6.3 | 7.7 | 6.9 |
| SYN 96-2 | 7.3 | 7.7 | 6.3 | 6.7 | 7.0 | 6.7 | 7.3 | 7.3 | 6.9 |
| PST-A2E | 7.3 | 6.7 | 5.3 | 6.3 | 7.0 | 7.3 | 7.3 | 7.7 | 6.8 |
| SRX 1NJH | 6.7 | 6.0 | 5.3 | 7.0 | 7.7 | 7.3 | 6.7 | 7.0 | 6.8 |
| BAR CB 8US3 | 6.3 | 6.0 | 5.3 | 6.0 | 6.7 | 7.7 | 7.0 | 7.7 | 6.7 |
| PENN G-1 | 7.3 | 5.7 | 5.7 | 6.7 | 6.7 | 7.0 | 6.7 | 7.3 | 6.7 |
| BRIGHTON (SRX 1120) | 6.3 | 5.7 | 5.0 | 5.7 | 6.7 | 7.7 | 6.7 | 7.7 | 6.6 |
| ISI AP-5 | 6.3 | 5.7 | 5.7 | 6.0 | 6.7 | 7.0 | 6.3 | 7.7 | 6.6 |
| SR 1119 | 6.7 | 5.7 | 5.7 | 6.7 | 6.7 | 7.3 | 6.7 | 6.7 | 6.6 |
| SYN 96-3 | 6.3 | 7.0 | 6.7 | 6.3 | 6.3 | 7.0 | 6.7 | 6.3 | 6.6 |
| PICK CB 13-94 | 7.0 | 6.0 | 4.7 | 6.3 | 6.7 | 7.0 | 6.3 | 7.0 | 6.3 |
| PROVIDENCE | 6.3 | 6.0 | 4.7 | 5.3 | 6.3 | 7.0 | 7.3 | 7.3 | 6.3 |
| SRX 1BPAA | 6.7 | 5.7 | 5.0 | 5.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.2 |
| BACKSPIN | 6.3 | 6.0 | 5.0 | 6.3 | 6.0 | 6.3 | 6.0 | 6.3 | 6.0 |
| PENNLINKS | 6.7 | 5.7 | 4.7 | 5.3 | 6.3 | 6.7 | 5.0 | 6.0 | 5.7 |
| BAVARIA (Velvet bent) | 6.3 | 4.0 | 4.7 | 4.7 | 5.7 | 5.7 | 5.0 | 5.7 | 5.2 |
| PENNCROSS | 6.0 | 5.0 | 4.3 | 5.3 | 5.0 | 5.3 | 5.0 | 5.7 | 5.1 |
| VESPER (PICK MVB) (Velvet bent) | 6.3 | 5.3 | 4.3 | 4.3 | 4.7 | 5.3 | 6.0 | 6.0 | 5.1 |
| SR 7200 | 6.7 | 4.3 | 4.3 | 4.3 | 5.0 | 5.3 | 5.0 | 5.3 | 4.9 |
| LSD | 2.4 | 1.5 | 1.1 | 1.2 | 1.2 | 1.7 | 1.3 | 1.3 | 0.6 |
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ISU Turfgrass:2003 Turfgrass Report | College of Agriculture |
Contents ©1995-2003, ISU Horticulture Department