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Li et al. 10.1073/pnas.0704591104.

Supporting Information

Files in this Data Supplement:

SI Table 4




Table 4. Biomass and grain yield of maize and faba bean in monoculture and intercropping systems in 4 yr from 2003 to 2006

   

Yields, kg/ha (% increase)

 

ANOVA

Crop

Cropping system

2003

2004

2005

2006

 

Variable

F

P

Grain

                 

Maize

M(C)

14,635 ± 1,718b (0)

10,398 ± 1,647b (0)

15,226 ± 2,191b (0)

10,992 ± 682b (0)

 

C

54.1

<0.0001

M&F(C)

19,033 ± 703a (30)

15,268 ± 1,367a (47)

22,233 ± 1,594a (46)

19,088 ± 371a (74)

 

Y

25.2

<0.0001

M&F(R)

17,188 ± 1,887ab (17)

15,275 ± 704a (47)

21,084 ± 1,288a (38)

15,906 ± 2,700a (45)

 

C·Y

1.5

0.2133

Faba bean

F(C)

3,313 ± 169a (0)

5,112 ± 204b (0)

5,737 ± 282a (0)

3,000 ± 834a (0)

 

C

9.6

0.0010

M&F(C)

3,513 ± 49a (6)

6,720 ± 400ab (31)

6,745 ± 1456a (18)

3,988 ± 804a (33)

 

Y

48.2

<0.0001

M&F(R)

3,414 ± 177a (3)

8,669 ± 778a (71)

7,243 ± 563a (26)

3,539 ± 256a (18)

 

C·Y

2.9

0.0308

Above-ground biomass

                 

Maize

M(C)

28,546 ± 2,300c (0)

23,763 ± 5,460b (0)

32,286 ± 6,193b (0)

23,077 ± 1,983b (0)

 

C

53.9

<0.0001

M&F(C)

34,951 ± 545a (22)

33,734 ± 3,977a (42)

51,452 ± 3,371a (59)

39,837 ± 1,550a (73)

 

Y

31.2

<0.0001

M&F(R)

31,749 ± 485b (11)

33,382 ± 3,415a (40)

46,777 ± 1,207a (45)

36,046 ± 4,221a (56)

 

C·Y

3.0

0.0254

Faba bean

F(C)

7,754 ± 1,091a (0)

13,300 ± 810b (0)

12,509 ± 2,015b (0)

7,954 ± 2,214a (0)

 

C

9.0

0.0014

M&F(C)

8,586 ± 681a (11)

18,728 ± 1,793a (41)

12,563 ± 2,917b (0)

10,759 ± 2,100a (35)

 

Y

64.0

<0.0001

M&F(R)

7,695 ± 658a (-1)

20,805 ± 761a (56)

15,122 ± 1,993ab (21)

8,391 ± 1,169a (5)

 

C·Y

4.3

0.0053

M(C), continuously cropped maize; F(C), continuously cropped faba bean; F&M(C), faba bean and maize continuously intercropped with the same crop on the same strips of land; and F&M(R), faba bean and maize rotationally intercropped with each crop rotated to the other crop's strips each year. Each treatment had three replicates and all plots received 225 kg/ha nitrogen fertilizer and 40 kg/ha P2O5 fertilizer. % Increase = (M&F-M)/M ´100 or = (M&F-F)/F ´ 100. Values in the same column within the same crop followed by different letters are significantly different by LSD multiple comparisons (P < 0.05). Two-way ANOVA with cropping (C) system and year (Y) as variables, where df is 2 for cropping, 3 for year, and 6 for interactions between cropping and year.





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