Table 2 Effects of plant growth regulators on brown rice rate, milled rice rate, head rice rate, chalkiness and amylose content of cultivars Peizataifeng and Huayou 86 in both early and late seasons in 2007

2007 early rice

Peizataifeng

CK

81.5 a

73.8 a

63.4 b

9.8 b

11.8 b

GA3

81.6 a

74.3 a

66.2 ab

13.2 a

12.5 b

PBZ

81.9 a

75.9 a

68.9 a

10.1 b

17.1 a

6-BA

82.0 a

75.4 a

66.5 ab

13.6 a

17.6 a

mean

81.7 A

74.9 A

66.3 B

11.7A

14.7 A

Huayou86

CK

81.4 a

75.4 a

66.0 b

12.9 a

15.5 a

GA3

82.5 a

75.6 a

67.5 b

12.4 a

15.1 a

PBZ

82.7 a

75.3 a

74.7 a

10.7 a

16.5 a

6-BA

81.3 a

74.0 a

67.2 b

11.4 a

14.3 a

mean

82.0 A

75.1 A

68.9 A

11.9 A

15.4 A

2007 late rice

Peizataifeng

CK

82.0 a

76.3 a

67.7 a

8.3 ab

14.5 b

GA3

82.4 a

77.2 a

70.0 a

10.1 a

17.9 a

PBZ

82.1 a

76.8 a

69.7 a

9.2 a

17.2 a

6-BA

82.0 a

77.4 a

69.7 a

6.7 b

17.2 a

mean

82.1 A

76.9 B

69.3 A

8.6 A

16.7 A

Huayou86

CK

81.9 a

78.6 a

68.9 a

7.0 b

14.0 b

GA3

81.7 a

78.6 a

70.1 a

8.7 b

18.5 a

PBZ

82.2 a

79.0 a

71.3 a

12.1 a

18.7 a

6-BA

81.2 a

79.0 a

70.1 a

10.1 ab

18.0 a

mean

81.7 A

79.0 A

70.1 A

9.5 A

17.3 A