Perennial Ryegrass Studies - 2000 Progress Report

Rodney A. St. John and Nick E. Christians

This was the first year of the trial that began in the fall of 1999 with the establishment of 134 cultivars of perennial ryegrass at the Iowa State University Horticulture Research Station. The study was established on an irrigated area that was maintained at a 2-inch mowing height and fertilized with 3 to 4 lb N/1000 ft2/yr. The area received herbicide treatments as required.

Cultivars were evaluated for turf quality April through October of 2000. Visual quality was assessed using a 9 to 1 scale with 9 = best, 6 = lowest acceptable, and 1 = worst quality. The values listed under each month in Table 1 are the averages of ratings made on three replicated plots for the three studies. Yearly means of data from each month are listed in the last column. The cultivars are listed in descending order of average quality.

Data for genetic color (Gcol) and spring greenup (Grn) also are included. The cultivars were rated for genetic color in July and the values were made using a 9 to 1 scale with 9 = dark and 1 = light green. Spring greenup data were taken in April and were estimated using a 9 to 1 scale with 9 = green and 1 = dormant turf.

Table 1. 2000 visual quality1 and other ratings2 for the 1999 National Perennial Ryegrass Study.

Visual quality

Cultivar

Gcol

Grn

May

June

July

Aug

Sep

Oct

Mean

1

CIS-PR-78

3.3

7.0

7.3

7.3

3.7

4.3

4.3

7.0

5.7

2

Exacta

2.7

7.7

7.3

7.0

4.0

3.7

5.0

7.0

5.7

3

MP107

3.3

8.0

8.0

7.7

4.0

4.0

4.3

6.0

5.7

4

Pick MDR

3.7

8.0

7.7

7.3

3.3

4.0

5.0

6.7

5.7

5

PST-2CRR

3.3

7.0

7.3

7.3

3.3

4.3

5.0

6.7

5.7

6

Roberts-627

2.7

7.0

7.3

7.7

4.0

3.7

4.3

7.3

5.7

7

BAR 9 B2

3.3

7.7

7.7

7.3

3.7

3.7

4.3

6.7

5.6

8

Pick RC2

2.7

8.0

7.3

6.7

4.0

4.7

4.7

6.3

5.6

9

Pizzazz

3.3

8.0

7.3

7.3

4.0

3.7

4.3

6.7

5.6

10

PST-2L96

3.7

7.3

7.3

7.3

4.0

4.3

4.0

6.3

5.6

11

ABT-99-4.965

3.0

8.0

7.7

7.3

3.3

4.0

4.0

6.7

5.5

12

CIS-PR-80

4.0

7.3

7.3

7.7

3.7

4.3

4.0

6.0

5.5

13

APR 1237

2.7

6.7

6.3

6.7

4.0

4.7

4.3

6.7

5.4

14

Cathedral II

2.7

6.7

6.7

6.7

3.7

5.0

4.3

6.0

5.4

15

CIS-PR-84

2.7

7.7

8.0

7.7

3.7

3.0

4.0

6.3

5.4

16

LPR 98-143

3.0

7.7

6.7

6.3

3.7

5.0

4.7

6.0

5.4

17

LTP-ME

3.3

7.3

7.3

6.7

3.7

3.7

4.0

7.0

5.4

18

Pick PR QH-97

2.7

7.7

8.0

7.0

3.3

3.0

4.0

7.0

5.4

19

Pick Prngs

2.3

7.0

7.0

6.7

3.7

4.7

4.3

6.0

5.4

20

Premier II

2.7

6.7

7.0

6.3

4.0

4.3

4.7

6.0

5.4

21

Promise

3.0

7.7

7.3

7.0

3.3

3.7

4.3

6.7

5.4

22

PST-2BR

3.0

7.7

7.7

7.3

3.7

3.7

4.0

6.3

5.4

23

PST-2LA

3.3

6.7

7.0

7.3

3.3

4.0

4.3

6.3

5.4

24

Radiant

3.0

7.7

7.7

7.0

3.0

3.7

4.3

7.0

5.4

25

SRX 4820

3.0

7.7

7.3

6.7

4.0

4.0

4.0

6.3

5.4

26

ABT-99-4.633

3.7

7.7

7.3

7.7

3.3

3.0

4.7

6.0

5.3

27

ABT-99-4.753

3.3

7.0

7.3

7.3

3.7

3.7

4.3

5.7

5.3

28

ABT-99-4.815

3.0

7.0

7.0

6.7

3.7

4.0

4.0

6.7

5.3

29

Affirmed

3.0

6.0

6.3

6.7

3.7

4.7

4.3

6.0

5.3

30

APR 1235

2.7

6.7

6.7

6.3

3.3

4.7

4.7

6.0

5.3

31

APR 1236

3.0

7.7

7.0

6.3

4.0

4.3

4.0

6.0

5.3

32

CIS-PR-75

3.0

7.0

7.7

7.3

3.3

4.0

4.0

5.7

5.3

33

CIS-PR-85

3.0

7.0

7.3

7.3

4.0

3.0

4.0

6.3

5.3

34

Fiesta 3

3.0

7.0

7.0

6.7

3.7

4.0

4.0

6.3

5.3

35

Headstart

2.7

7.3

7.0

6.7

4.0

3.7

4.3

6.0

5.3

36

MP 103

2.7

7.3

7.0

6.3

3.7

3.0

4.0

6.5

5.3

37

MP 58

3.0

7.0

7.0

6.7

3.7

4.0

4.0

6.7

5.3

38

Pennant II

3.0

7.3

6.7

6.3

3.7

4.3

4.7

6.3

5.3

39

Pennington-1130

3.7

7.0

7.0

7.0

4.0

4.0

4.0

6.0

5.3

40

Phantom

3.0

7.0

7.0

7.0

3.7

3.7

4.3

6.3

5.3

41

Premier

2.7

6.3

6.7

6.7

3.7

4.7

3.7

6.3

5.3

42

PST-2RT

2.7

7.0

6.7

6.0

3.7

4.3

4.3

6.7

5.3

43

SRX 4801

3.3

7.3

7.0

7.0

3.7

3.7

4.0

6.3

5.3

44

SRX 4RHT

3.3

7.0

7.0

7.0

3.7

3.3

4.3

6.3

5.3

45

Wilmington

3.3

7.0

7.0

7.0

3.3

3.3

4.3

6.7

5.3

46

ABT-99-4.629

2.7

7.3

7.3

6.7

3.7

3.0

4.0

6.3

5.2

47

ABT-99-4.721

3.3

7.0

7.0

7.0

3.3

3.3

4.0

6.3

5.2

48

ABT-99-4.903

2.7

7.7

7.3

6.7

3.7

4.0

4.3

5.3

5.2

49

ABT-99-4.960

3.3

6.7

7.0

7.0

3.0

3.3

4.0

6.7

5.2

50

Allsport

2.7

6.7

6.7

6.7

3.7

3.7

4.0

6.7

5.2

51

APR 777

2.7

6.3

6.7

6.3

3.3

3.7

4.3

6.7

5.2

52

Brightstar II

2.7

6.7

7.0

7.3

3.3

3.0

4.0

6.3

5.2

53

Calypso II

2.7

6.3

6.7

6.7

3.7

3.3

4.0

6.7

5.2

54

CAS-LP84

3.0

7.3

7.0

7.0

3.7

4.3

4.0

5.3

5.2

55

Charger II

2.3

6.0

6.3

6.7

3.3

4.3

4.3

6.3

5.2

56

Churchill

3.3

6.3

6.7

7.0

3.7

3.3

4.3

6.0

5.2

57

CIS-PR-69

3.3

6.7

6.7

7.0

3.7

3.3

4.0

6.7

5.2

58

Elfkin

2.3

7.3

7.0

6.7

3.3

3.7

4.0

6.3

5.2

59

EP53

3.0

7.0

7.0

7.0

3.3

3.7

4.0

6.0

5.2

60

Jet

3.0

7.7

7.3

7.0

3.3

3.0

4.3

6.3

5.2

61

JR-151

2.3

6.0

6.3

6.0

3.7

4.3

4.0

6.7

5.2

62

LTP 98-501

3.3

7.7

7.3

7.0

4.0

3.3

4.0

5.7

5.2

63

Nexus

3.3

8.0

7.3

7.0

3.7

3.3

4.3

5.7

5.2

64

Palmer III

2.7

7.3

6.7

6.3

3.7

4.7

4.3

5.7

5.2

65

Paragon

3.3

6.7

6.7

6.7

4.0

3.3

4.0

6.3

5.2

66

Pick PR 1-94

3.3

7.3

6.7

6.3

3.7

4.3

4.3

6.0

5.2

67

Pleasure XL

2.7

6.7

6.7

6.7

3.7

4.7

4.0

5.7

5.2

68

PST-2SLX

2.7

7.0

7.0

7.0

3.0

3.7

4.0

6.3

5.2

69

R8000

3.3

7.3

7.3

7.0

3.7

3.0

4.0

6.0

5.2

70

Seville II

3.0

6.3

6.7

7.3

3.7

3.3

4.0

6.0

5.2

71

6011

3.0

7.0

7.0

6.3

3.3

3.7

4.0

6.3

5.1

72

ABT-99-4.339

3.0

6.0

6.3

6.3

3.0

4.0

4.0

6.7

5.1

73

ABT-99-4.461

3.3

7.0

7.0

7.0

3.0

4.0

4.0

5.7

5.1

74

ABT-99-4.464

3.0

7.3

7.0

6.3

3.7

3.3

4.0

6.0

5.1

75

ABT-99-4.560

3.0

6.7

6.7

7.0

3.7

3.7

4.0

5.7

5.1

76

ABT-99-4.709

3.0

7.7

7.0

6.7

3.3

3.3

4.0

6.3

5.1

77

ABT-99-4.834

3.7

6.7

6.7

7.3

3.3

3.3

4.0

6.0

5.1

78

AG-P981

3.0

7.3

7.0

6.0

3.3

4.0

4.0

6.0

5.1

79

APR 776

2.7

6.7

6.3

6.3

3.0

4.3

4.3

6.0

5.1

80

B1

2.7

7.3

7.0

6.7

3.0

3.0

4.0

6.7

5.1

81

Barlennium

2.7

6.7

6.7

6.3

3.7

3.7

4.0

6.3

5.1

82

Catalina

2.7

6.7

6.7

6.3

3.7

3.7

4.3

6.0

5.1

83

CIS-PR-72

3.0

7.3

7.0

6.7

3.3

3.7

4.0

5.7

5.1

84

DLF-LDD

3.3

6.7

7.0

6.7

3.7

3.3

3.7

6.0

5.1

85

EP57

3.0

6.7

6.7

7.0

3.7

4.0

4.0

5.3

5.1

86

EPD

3.0

6.0

7.0

7.3

3.0

3.3

4.0

6.0

5.1

87

JR-128

2.7

7.0

6.3

6.0

3.7

4.3

4.3

5.7

5.1

88

KOOS R-71

2.3

6.3

6.3

6.0

3.3

4.7

4.0

6.0

5.1

89

Line Drive

2.3

6.7

6.7

6.0

3.3

4.3

4.0

6.3

5.1

90

Majesty

2.7

6.7

6.3

6.3

3.7

4.3

4.0

6.0

5.1

91

NJ-6401

3.0

7.0

7.0

6.0

3.7

4.0

4.0

5.7

5.1

92

Passport

2.3

6.3

6.3

6.3

3.7

4.3

4.0

6.0

5.1

93

PST-2CRL

2.7

7.3

7.0

6.7

3.3

3.0

4.0

6.3

5.1

94

PST-2JH

2.7

6.3

6.3

6.3

3.7

4.0

4.0

6.3

5.1

95

PST-2M4

3.0

7.0

6.7

6.3

3.7

4.3

4.0

5.7

5.1

96

PST-2SBE

3.3

6.3

7.0

7.3

3.3

3.3

4.0

5.7

5.1

97

Racer

3.0

6.7

6.7

6.0

4.0

4.0

4.0

5.7

5.1

98

Secretariat

2.0

6.0

6.7

6.3

3.3

4.0

4.0

6.3

5.1

99

Skyhawk

3.3

6.3

6.7

6.7

3.7

3.7

4.0

5.7

5.1

100

ABT-99-4.724

3.0

7.0

7.0

7.0

3.0

3.0

3.7

6.3

5.0

101

APR 1232

3.0

7.0

6.7

6.0

3.3

3.3

4.3

6.3

5.0

102

APR 1233

2.3

6.3

6.0

6.0

3.7

4.3

4.3

5.7

5.0

103

APR1234

2.0

6.7

6.7

6.0

3.3

4.3

4.0

5.7

5.0

104

Ascend

3.0

6.3

6.3

6.3

3.7

4.0

4.0

5.7

5.0

105

Divine

2.7

7.0

6.3

6.0

3.3

4.0

4.0

6.3

5.0

106

PST-2A6B

2.7

7.0

6.7

6.3

3.3

3.3

4.0

6.3

5.0

107

SR 4500

2.3

7.0

6.3

6.0

3.0

3.7

4.3

6.7

5.0

108

ABT-99-4.115

2.7

6.7

6.3

6.3

3.3

3.7

4.0

5.7

4.9

109

ABT-99-4.600

2.7

6.3

6.3

6.3

3.3

3.7

4.3

5.7

4.9

110

APR 1231

2.3

6.7

6.3

6.0

3.7

3.7

4.0

6.0

4.9

111

Buccaneer

2.0

6.3

6.3

6.0

3.7

4.3

3.7

5.7

4.9

112

DP LP-1

2.3

6.7

6.7

6.0

3.3

4.3

4.0

5.3

4.9

113

JR-187

3.3

7.0

6.7

6.0

3.7

3.3

4.0

6.0

4.9

114

JR-317

2.7

6.7

6.3

6.0

3.7

3.3

4.0

6.0

4.9

115

LPR 98-144

2.3

5.3

5.7

6.3

3.0

4.0

4.0

6.3

4.9

116

Manhattan 3

2.7

6.3

6.3

6.3

3.7

4.0

4.0

5.3

4.9

117

MDP

3.7

6.7

6.7

6.7

3.0

3.3

4.0

6.0

4.9

118

MEPY

2.3

7.0

7.0

6.0

3.0

3.0

4.0

6.3

4.9

119

Panther

2.7

6.3

6.3

6.0

3.3

3.7

4.0

6.3

4.9

120

PST-CATS

2.7

7.0

6.7

6.3

3.0

3.7

4.0

6.0

4.9

121

WVPB-R-82

2.7

6.0

6.0

5.7

4.0

4.7

3.3

6.0

4.9

122

WVPB-R-84

2.3

6.0

6.0

5.7

3.7

4.3

4.0

6.0

4.9

123

Yatsugreen

2.0

6.3

5.7

4.3

4.0

5.0

4.0

6.3

4.9

124

Pick EX2

2.3

6.3

6.3

5.7

3.7

3.0

3.7

6.3

4.8

125

Pick PR B-97

2.7

6.3

6.3

6.3

3.0

3.0

4.0

6.0

4.8

126

ABT-99-4.625

2.3

6.7

6.7

6.0

2.7

3.0

4.0

6.0

4.7

127

BY-100

2.3

5.7

6.0

6.0

3.7

3.3

3.3

5.7

4.7

128

DP 17-9069

2.0

5.7

5.7

5.3

3.3

4.7

3.3

5.7

4.7

129

Edge

2.0

5.7

6.0

6.0

3.0

3.7

3.7

5.7

4.7

130

SRX 4120

2.0

6.3

6.0

5.7

3.3

3.0

4.3

6.0

4.7

131

Affinity

2.0

6.0

5.3

5.3

3.3

4.7

4.0

5.0

4.6

132

DP 17-9496

2.0

5.0

5.3

4.7

4.0

5.0

3.0

5.7

4.6

133

Linn

3.0

5.0

5.0

4.7

4.0

4.0

3.3

6.0

4.5

134

DP 17-9391

2.3

5.7

5.3

4.7

3.3

4.3

3.0

5.7

4.4

LSD(0.05)

1.2

NS

1.0

1.0

NS

1.9

1.3

NS

0.9

1Visual quality was assessed using a 9 to 1 scale with 9 = best quality, 6 = lowest acceptable quality, and 1 = worst quality.

2Genetic color (Gcol) was rated using a 9 to 1 scale with 9 = dark and 1 = light green. Spring greenup (Grn) was determined using a 9 to 1 scale with 9 = green and 1 = dormant.

NS = means are not significantly different at the 0.05 level.