Table 4. Initial root and plant evaluations of wheat in various rotations in selected fields in North Dakota, 1999.

 

Location

 

Treatment

Development stage

 

Length1

 

Tillers

Subcrown rating2

Seminal root count

Crown root count

 

 

Haun

inches

no./plant

 

no./plant

no./plant

Amidon

 

 

 

 

Fumigated

6.2

18.5

1.4

0.4

5.5

11.3

Natural

6.2

14.1

1.2

0.4

5.2

9.7

Mean

6.2

16.3

1.3

0.4

5.3

10.5

CV %

2.2

15.0

17.2

54.1

6.3

6.7

LSD .05

NS

NS

NS

NS

NS

1.6

 

Beach

 

 

 

 

 

 

Spring Fumigated

5.1

15.8

3.4

0.3

5.5

8.3

Fall Fumigated

5.0

14.5

3.1

0.2

5.7

8.2

Metylaxyl

5.4

13.9

3.1

0.1

5.1

7.6

Natural

4.5

13.2

2.8

0.4

4.5

4.6

Mean

5.0

14.3

3.1

0.2

5.2

7.1

CV %

8.4

5.9

17.9

94.0

15.2

18.4

LSD .05

NS

3.4

NS

NS

NS

2.1

 

Center

 

 

 

 

Fumigated

11.0

33.7

1.9

0.3

5.7

16.3

Natural

10.7

33.3

1.1

0.6

4.6

14.3

Mean

10.9

33.5

1.5

0.4

5.2

15.3

CV %

3.0

1.3

26.2

113.1

5.4

5.1

LSD .05

NS

NS

NS

NS

0.6

1.8

 

Garrison

 

 

 

 

Fumigated

9.3

22.2

2.4

0.3

5.5

16.9

Natural

8.5

21.2

1.3

1.1

4.7

13.9

Mean

8.9

21.7

1.8

0.7

5.1

15.4

CV %

11.9

5.6

31.2

80.6

5.8

19.3

LSD .05

NS

NS

NS

NS

0.7

NS

 

Hazen

 

 

 

 

Fumigated

5.6

15.9

3.6

0.1

5.9

8.9

Natural

5.8

14.6

3.0

0.4

5.8

8.7

Mean

5.7

15.2

3.3

0.2

5.8

8.8

CV %

6.5

4.1

25.9

115.5

5.1

23.2

LSD .05

NS

NS

NS

NS

NS

NS

 

Selfridge

 

 

 

 

Fumigated

5.5

18.2

2.4

0.1

5.4

10.4

Natural

5.2

15.2

2.2

0.2

5.3

7.2

Mean

5.4

16.7

2.3

0.2

5.4

8.8

CV %

6.8

2.8

12.3

115.3

6.1

11.5

LSD .05

NS

2.7

NS

NS

NS

2.3

1 Length measured from the crown to the tip of the last fully extended leaf of the plant.

2 Subcrown internode rating, 0-4. 0 = no infection, 1 = lest than 25% of the internode infected, 2 = 25-50% of the internode infected, 3 = 51 75% of internode infected, multiple lesions, and 4 = 75 to 100% of internode infected, lesions coalesced.