Soils, Crops and Fertilizer Use: A Field Manual for Development Workers (Peace Corps, 1986, 338 p.): Appendixes: Appendix C: Spacing guide for contour ditches and other erosion barriers*

Soils, Crops and Fertilizer Use: A Field Manual for Development Workers (Peace Corps, 1986, 338 p.)

Appendixes

		Appendix A: Useful measurements and conversions
		Appendix B: How to determine soil moisture content
		Appendix C: Spacing guide for contour ditches and other erosion barriers*
		Appendix D: Composition of common chemical fertilizers
		Appendix E: Hunger signs in common crops
		Appendix F: Legumes for green manuring and cover-cropping in tropical and subtropical regions
		Appendix G: Some sources of technical support
		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	3°	21.6
6		19.3
7	4°	17.7
8		16.6
9	5°	15.8
10		15.0
11	6º	14.2
12	7°	13.4
13		12.7
14	8°	12.1
15		11.5
16	9º	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.