Table 50. Minimum tillage, double disking, and seeding for wheat production on recrop.

Year

Minimum tillage
and seeding

Double disking and
conventional seeding

 

Bu/A

1976

28.0

27.0

1977

12.6

15.0*

1978

10.3

28.5

1979

9.6

15.9*

1980

0.0

0.0

1981

15.3

14.3

1982

20.9

31.8*

1983

39.0

38.5

1984

20.4

27.2*

1985

14.8

20.6*

1986

24.3

30.6*

1987

4.8

9.3*

1988

0.0

0.0

1989

9.3*

5.7

1990

11.8

10.6

15 Year Average

14.7

18.3

*Yield significantly higher.