1998 Iowa Turfgrass Research Report

1998 Iowa Turfgrass Research Report

Green Height Bentgrass Cultivar Trial (Native Soil) - Established 1993

Nick E. Christians and James R. Dickson

This is the fourth year of data from the Green Height Bentgrass Cultivar trial established in the fall of 1993. The area was 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 28 seeded cultivars including a number of experimentals. This trial will be replaced with a new study at the end of the 1998 season.

The cultivars are maintained with a fertilizer program of 1/4 to 1/2 lb. N applied at 14-day intervals with a total of 3 to 4 lb. N/1000 ft²/growing season. Fungicides are used as needed in a preventive program. Herbicides and insecticides are applied as needed.

Penn A-4 (A-4) was the highest rated cultivar in 1997 (Table 1). Penncross, which has traditionally been a good performer at the ISU research area fell to 23rd place this year. The reason for that drop is unknown. The first 13 cultivars are statistically the same. Data on genetic color (Gcolor), leaf texture (Ltex), and green up (Grnup), ratings are also included in Table 1. This was the fourth full year of data.

Table 1. The 1997 ratings for the green height bentgrass trial.

					Quality
	Cultivar	Gcolor	Ltex	Grnup	May	June	July	Aug	Sept	Oct	Mean
1	Penn A-4(A-4)	7.7	7.7	6.0	5.7	6.7	7.0	8.0	7.7	6.7	6.9
2	Century (Syn 92-1)	6.3	7.3	6.0	5.7	6.0	7.0	7.7	8.0	6.3	6.8
3	Penn G-2 (G-2)	6.7	7.7	6.7	6.3	6.3	6.7	6.7	8.0	6.7	6.8
4	Imperial (Syn 92-5)	7.0	7.0	6.7	6.0	6.0	6.7	7.0	7.3	7.3	6.7
5	Penn A-1 (A-1)	7.3	7.7	6.3	5.7	6.3	7.0	7.3	6.7	7.0	6.7
6	Crenshaw	7.3	7.3	6.7	5.3	6.3	6.0	7.0	7.7	7.0	6.6
7	Penn G-6 (G-6)	7.0	6.7	6.3	6.0	6.3	6.3	6.7	7.0	6.3	6.4
8	Backspin (Syn 92-2)	6.7	7.0	5.0	5.3	6.0	6.3	6.3	7.3	6.7	6.3
9	Cato	7.7	7.0	6.0	6.0	6.0	5.7	6.7	7.0	6.3	6.3
10	Lofts L-93(l-93)	7.0	6.7	6.7	5.7	6.3	6.3	6.7	6.7	6.0	6.3
11	SR 1020	6.3	6.7	6.3	5.7	6.7	6.0	6.7	6.0	7.0	6.3
12	Bar WS 42102	6.3	7.0	6.0	6.0	6.0	6.0	6.7	6.3	6.0	6.2
13	Pennlinks	6.3	6.0	6.3	6.3	6.0	5.7	6.3	6.0	6.0	6.1
14	18th Green	7.3	5.7	6.3	6.0	5.3	6.3	6.3	6.3	5.7	6.0
15	Regent	6.0	6.0	6.3	6.3	6.0	5.7	6.0	6.0	6.0	6.0
16	DG-P	6.7	6.3	5.3	5.7	6.0	5.7	6.7	6.0	5.3	5.9
17	Pro/Cup	6.7	6.3	6.0	5.3	6.0	6.3	6.0	6.3	5.7	5.9
18	Providenco	7.7	6.0	6.3	5.7	5.3	6.0	6.7	6.3	5.7	5.9
19	ISI-AP-89150	6.7	6.0	6.0	6.0	5.7	6.0	5.7	5.7	5.7	5.8
20	Lopez	6.0	6.0	5.7	6.0	5.7	5.3	6.3	6.7	5.0	5.8
21	Trueline	6.3	6.0	6.3	6.0	5.7	5.3	6.3	6.0	5.3	5.8
22	Mariner (Syn-1-88)	6.3	6.0	6.3	5.3	6.0	5.3	5.7	6.0	6.0	5.7
23	Penncross	6.0	5.7	6.0	5.7	5.3	5.0	5.7	6.0	6.0	5.6
24	Msueb	5.7	6.0	6.0	6.0	4.7	5.0	5.3	6.0	5.3	5.4
25	Southshore	6.3	6.7	6.0	5.3	5.0	5.3	5.3	6.0	5.7	5.4
26	Bar AS 492	6.0	6.0	6.7	5.3	5.3	5.0	5.3	4.7	4.7	5.1
27	Seaside	5.7	5.3	5.7	5.3	5.0	4.7	4.7	5.0	5.3	5.0
28	Tendenz	5.7	5.7	5.7	4.7	4.0	4.0	4.7	4.7	5.0	4.5
	LSD(0.05)	1.3	0.9	2.5	2.0	1.9	1.2	1.3	1.0	1.4	0.8

Gcolor (Genetic color): 9 = dark green and 1 = light green.

Ltex (Leaf texture): 9 = fine and 1 = coarse.

Grnup(Greenup): 9 = best and 1 = poorest greenup.

Quality based on a 9 to 1 scale: 9 = best quality, 6 = lowest acceptable quality, and 1 = poorest quality.

ISU Horticulture:Publications:1998 Turfgrass Report

College of Agriculture