Cultivars

years

c

b

a

R2

MY (Mg∙ha−1)

ONR (kg∙N∙ha−1)

Innovator

2003/4

0.0002

−0.01

52.4

0.54*

-

-

2004/5

−0.0006

0.22

43.6

0.79***

63.8

183

2005/6

−0.0004

0.18

44.4

0.50*

64.6

225

2006/7

−0.0002

0.06

50.4

0.57*

54.9

150

Gem Russet

2003/4

−0.0002

0.06

39.7

0.04 ns

-

-

2004/5

−0.0003

0.12

50.9

0.50*

62.5

200

2005/6

−0.0002

0.07

55.7

0.45*

61.8

175

2006/7

−0.0003

0.10

43.5

0.56*

51.8

167

Umatilla Russet

2004/5

−0.0005

0.17

48.9

0.79***

63.3

170

2005/6

−0.0003

0.12

48.9

0.60*

60.9

200

2006/7

−0.0004

0.16

39.4

0.63*

55.4

200

Bannock Russet

2003/4

−0.0003

0.11

37.5

0.58*

45.8

183

2004/5

−0.0005

0.15

50.8

0.51*

62.0

150

2005/6

−0.0001

0.05

58.4

0.56*

64.6

250

Markies Russet

2004/5

−0.0002

0.08

58.8

0.77***

66.8

200

2005/6

−0.0004

0.17

48.6

0.88***

66.6

212