Cover Image
close this book Soils, Crops and Fertilizer Use
close this folder Appendixes
View the document Appendix A: Useful measurements and conversions
View the document Appendix B: How to determine soil moisture content
View the document Appendix C: Spacing guide for contour ditches and other erosion barriers*
View the document Appendix D: Composition of common chemical fertilizers
View the document Appendix E: Hunger signs in common crops
View the document Appendix F: Legumes for green manuring and cover-cropping in tropical and subtropical regions
View the document Appendix G: Some sources of technical support
View the document Appendix H: A bibliography of useful references

Appendix C: Spacing guide for contour ditches and other erosion barriers*

(See Chapter 3)

% SLOPE

DEGREESSLOPE

DISTANCE BETWEEN DITCHES** IN METERS

5

21.6

6

 

19.3

7

17.7

8

 

16.6

9

15.8

10

 

15.0

11

14.2

12

13.4

13

 

12.7

14

12.1

15

 

11.5

16

11.0

17

 

10.5

18

10º

10.0

19

 

9.5

20

11°

9.0

21

 

8.6

22

 

8.2

23

 

7.8

24

 

7.5

25

14°

7.2

26

 

7.0

27

 

6.7

28

 

6.4

29

 

6.2

30

17°

6.0

31

 

5.8

32

 

5.6

33

 

5.4

34

 

5.2

35

19°

6.0

36

 

4.9

37

 

4.8

38

 

4.7

39

 

4.6

40

22º

4.5

41

 

4.4

42

 

4.3

43

 

4.3

44

 

4.1

45

24°

4.0

* These spacings are suitable for contour ditches, rock walls, and other erosion barriers.

** The distances in column 3 are based on Peace Corps project experience in El Salvador. Check with conservation specialists in your region for their recommendations.