Table 1. Analysis of variance of contrasting seeding rates and hard red spring cultivars across conventional-, reduced-, and no-tillage environments in a wheat-fallow rotation experiment located at Dickinson, ND, during 1995, 1996, and 1997.
 

Plant stand

Grain

Yield

Crude protein

1995

1996

1997

1995

1996

1997

1995

1996

1997

Tillage system (T)

1000 plants/acre

bu/acre

%

Conventional tillage

597

723

750

41

46

33

14.5

15.2

15.2

Reduced tillage

644

808

792

42

44

36

14.3

15.2

15.4

No-tillage

682

800

672

37

51

31

14.1

14.8

14.6

Seeding rate (SR)
500 000 kernels/acre

340

398

390

37

46

32

14.4

15.0

15.0

1 000 000 kernels/acre

661

804

773

41

48

35

14.3

15.1

15.0

1 500 000 kernels/acre

922

1 130

1 050

42

48

34

14.3

15.2

15.2

Wheat cultivar (WC)
AC Minto

734

788

654

33

42

29

15.1

15.7

15.9

Amidon

648

777

775

42

46

37

14.1

15.1

14.9

Bergen

671

849

815

44

52

34

13.9

14.4

14.6

Grandin

489

739

674

39

47

32

14.5

15.7

15.3

Norm

664

731

773

41

50

34

14.1

14.5

14.6

 

Analysis of variance

T

NS1

*

NS

NS

NS

NS

NS

NS

*

SR

*

*

*

*

*

NS

NS

NS

NS

T x SR

NS

NS

NS

NS

NS

NS

NS

NS

NS

WC

*

*

*

*

*

*

*

*

*

T x WC

NS

NS

NS

NS

NS

NS

NS

NS

NS

SR x WC

*

NS

*

NS

*

NS

NS

NS

NS

T x SR x WC

NS

NS

NS

NS

NS

NS

NS

NS

NS

1NS = not significant at the P < 0.05 level; * = significant at the P < 0.05 level.