APPENDIX 5 - Conversion factors, Traditional to S.I. Units.

Traditional unit ®

Multiply value by factor to arrive at value for ®

S.I. Unit

ppm

1

mg kg^-1

mg/100g

10

mg kg^-1

mEq/100 g (CEC and monovalent ions)

10

mmol kg^-1

(n-valent ions)

10/n

mmol kg^-1

dS m^-1, mS cm^-1, mmhos/cm

0.1

Sm^-1

bar (atmosphere)

0.1

MPa

gdm^-3, g/l

1

kg m^-3

gem^-3 (bulk density)

1

Mg m^-3

millimoles dm^-3 (mM)

1

mol m^-3

Mol masses:

Ca

40

SO₄

96

gypsum (CaSO₄ 2H₂O)

172

FAO SOILS BULLETINS

1.

Soils of the arid zones of Chile, 1965 (E**)

2.

Survey of soil laboratories in 64 FAO member countries, 1965 (E**)

3.

Guide on general and specialized equipment for soil laboratories 1966 (E**)

4.

Guide to 60 soil water conservation practices, 1966 (E**)

5

Selection of soil for cocoa, 1966 (E** F** S**)

6.

Aerial photo interpretation in soil survey. 1967 (C** E** F* S**)

7.

A practical manual of soil microbiology laboratory methods, 1967 (E**)

8.

Soil survey interpretation and its use, 1967 (E**)

9.

The preparation of soil survey reports, 1970 (E** F** S**)

10.

Physical and chemical methods of soil and water analysis, 1970 (E* F* S*)

11.

Soil fertility investigations on farmers' fields, 1970 (E* F* S*)

12

A study on the response of wheat to fertilizers, 1971 (E*)

13.

Land degradation, 1971 (C** E**)

14.

Improving soil fertility in Africa, 1971 (E** F**)

15.

Legislative principles of soil conservation, 1971 (E*)

16.

Effects of intensive fertilizer use on the human environment, 1972 (E*)

17.

Trace elements in soils and agriculture, 1972 (E* F* S**)

18.

Guide to the calibration of soil tests for fertilizer recommendations, 1973 (E* S**)

19.

Soil survey interpretation for engineering purposes, 1973 (E* F** S**)

20.

Fertilizer legislation, 1973 (E** S*)

21.

Calcareous soils, 1973 (E** F**)

22.

Approaches to land classification, 1974 (E**)

23.

Management properties of ferralsols, 1974 (E*)

24.

Shifting cultivation and soils conservation in Africa, 1974 (E** F* S*)

25.

Sandy soils, 1975 (E*)

26.

Planning and organization of fertilizer development in Africa, 1975 (E**)

27.

Organic materials as fertilizers, 1975 (E* F** S**)

28.

S.l. units and nomenclature in soil science, 1975 (E*)

29.

Land evaluation in Europe, 1976 (E**)

30.

Soil conservation for developing countries, 1976 (A* C** E* F** S**)

31.

Prognosis of salinity and alkalinity, 1976 (E*)

32.

A framework for land evaluation, 1976 (C** E* F* S**)

33.

Soil conservation and management .in developing countries, 1977 (E* F*)

34.

Assessing soil degradation, 1977 (E*)

35.

Organic materials and soil productivity, 1978 (C** E*)

36.

Organic recycling in Asia, 1978 (C* E**)

37.

Improved use of plant nutrients, 1978 (C** E*)

38/1.

Soil and plant testing and analysis, 1980 (E*)

38/2.

Soil and plant testing as a basis of fertilizer recommendations. 1980 (E** S**)

39.

Salt-affected soils and their management, 1988 (A* E*)

40.

China: recycling of organic wastes in agriculture, 1978 (E* F* S*)

41.

China: azolla propagation and small-scale biogas technology, 1979 (E* F* S*)

42.

Soil survey investigations for irrigation, 1979 (C** E* F***)

43.

Organic recycling in Africa. 1980 (E*)

44.

Watershed development with special reference to soil and water conservation, 1979 (C** E* F* S*)

45.

Organic materials and soil productivity in the Near East. 1982 (E* with Arabic summary)

46.

Blue-green algae for rice production - a manual for its promotion, 1981 (E*)

47.

Le recyclage des résidus agricoles organiques en Afrique. 1982 (F*)

48

Micronutrients and the nutrient status of soils: a global study, 1982 (E*)

49.

Application of nitrogen-fixing systems in soil management, 1982 (C** E* F* S*)

50.

Keeping the land alive: soil erosion - its causes and cures, 1983 (E* F* S*)

51.

El reciclaje de materias orgánicas en la agricultura de América Latina, 1983 (S*)

52.

Guidelines: land evaluation for rainfed agriculture, 1983 (E* F* S*)

53.

Improved' production systems as an alternative to shifting cultivation, 1984 (E* F* S*)

54.

Tillage systems for soil and water conservation, 1984 (C*** E* F* S*)

55.

Guidelines: land evaluation for irrigated agriculture, 1985 (E* F* S***)

56.

Soil management: compost production in tropical and subtropical environments, 1987 (E* F* S***)

57.

Soil and water conservation in semi-arid areas, 1987 (E* F*)

58.

Guidelines: land evaluation for extensive grazing, 1988 (E***)

59.

Nature and management of tropical peat soils, 1988 (E*)

60.

Soil conservation for small farmers in the humid tropics, 1989 (E* S***)

61.

Radioactive fallout in soils, crops and food, 1989 (E* F***)

62.

Management of gypsiferous soils, 1990 (E*)

Availability: June 1990

A - Arabic

* Available

C - Chinese

** Out of print

E - English

*** In preparation

F - French

S - Spanish

FAO Soils Bulletins are available through the authorized FAO Sales Agents or directly from Distribution and Sales Section, FAO, Via delle Terme di Caracalla, 00100 Rome, Italy.

M-51/T0323E/1/6.90/3000
ISBN 92-5-102948-2

Traditional unit ®		Multiply value by factor to arrive at value for ®	S.I. Unit
ppm		1	mg kg^-1
mg/100g		10	mg kg^-1
mEq/100 g (CEC and monovalent ions)		10	mmol kg^-1
(n-valent ions)		10/n	mmol kg^-1
dS m^-1, mS cm^-1, mmhos/cm		0.1	Sm^-1
bar (atmosphere)		0.1	MPa
gdm^-3, g/l		1	kg m^-3
gem^-3 (bulk density)		1	Mg m^-3
millimoles dm^-3 (mM)		1	mol m^-3
Mol masses:	Ca		40
	SO₄		96
	gypsum (CaSO₄ 2H₂O)		172

1.	Soils of the arid zones of Chile, 1965 (E**)
2.	Survey of soil laboratories in 64 FAO member countries, 1965 (E**)
3.	Guide on general and specialized equipment for soil laboratories 1966 (E**)
4.	Guide to 60 soil water conservation practices, 1966 (E**)
5	Selection of soil for cocoa, 1966 (E F S**)
6.	Aerial photo interpretation in soil survey. 1967 (C E F* S**)
7.	A practical manual of soil microbiology laboratory methods, 1967 (E**)
8.	Soil survey interpretation and its use, 1967 (E**)
9.	The preparation of soil survey reports, 1970 (E F S**)
10.	Physical and chemical methods of soil and water analysis, 1970 (E* F* S*)
11.	Soil fertility investigations on farmers' fields, 1970 (E* F* S*)
12	A study on the response of wheat to fertilizers, 1971 (E*)
13.	Land degradation, 1971 (C E)
14.	Improving soil fertility in Africa, 1971 (E F)
15.	Legislative principles of soil conservation, 1971 (E*)
16.	Effects of intensive fertilizer use on the human environment, 1972 (E*)
17.	Trace elements in soils and agriculture, 1972 (E* F* S**)
18.	Guide to the calibration of soil tests for fertilizer recommendations, 1973 (E* S**)
19.	Soil survey interpretation for engineering purposes, 1973 (E* F S)
20.	Fertilizer legislation, 1973 (E** S*)
21.	Calcareous soils, 1973 (E F)
22.	Approaches to land classification, 1974 (E**)
23.	Management properties of ferralsols, 1974 (E*)
24.	Shifting cultivation and soils conservation in Africa, 1974 (E** F* S*)
25.	Sandy soils, 1975 (E*)
26.	Planning and organization of fertilizer development in Africa, 1975 (E**)
27.	Organic materials as fertilizers, 1975 (E* F S)
28.	S.l. units and nomenclature in soil science, 1975 (E*)
29.	Land evaluation in Europe, 1976 (E**)
30.	Soil conservation for developing countries, 1976 (A* C** E* F S)
31.	Prognosis of salinity and alkalinity, 1976 (E*)
32.	A framework for land evaluation, 1976 (C** E* F* S**)
33.	Soil conservation and management .in developing countries, 1977 (E* F*)
34.	Assessing soil degradation, 1977 (E*)
35.	Organic materials and soil productivity, 1978 (C** E*)
36.	Organic recycling in Asia, 1978 (C* E**)
37.	Improved use of plant nutrients, 1978 (C** E*)
38/1.	Soil and plant testing and analysis, 1980 (E*)
38/2.	Soil and plant testing as a basis of fertilizer recommendations. 1980 (E S)
39.	Salt-affected soils and their management, 1988 (A* E*)
40.	China: recycling of organic wastes in agriculture, 1978 (E* F* S*)
41.	China: azolla propagation and small-scale biogas technology, 1979 (E* F* S*)
42.	Soil survey investigations for irrigation, 1979 (C** E* F***)
43.	Organic recycling in Africa. 1980 (E*)
44.	Watershed development with special reference to soil and water conservation, 1979 (C** E* F* S*)
45.	Organic materials and soil productivity in the Near East. 1982 (E* with Arabic summary)
46.	Blue-green algae for rice production - a manual for its promotion, 1981 (E*)
47.	Le recyclage des résidus agricoles organiques en Afrique. 1982 (F*)
48	Micronutrients and the nutrient status of soils: a global study, 1982 (E*)
49.	Application of nitrogen-fixing systems in soil management, 1982 (C** E* F* S*)
50.	Keeping the land alive: soil erosion - its causes and cures, 1983 (E* F* S*)
51.	El reciclaje de materias orgánicas en la agricultura de América Latina, 1983 (S*)
52.	Guidelines: land evaluation for rainfed agriculture, 1983 (E* F* S*)
53.	Improved' production systems as an alternative to shifting cultivation, 1984 (E* F* S*)
54.	Tillage systems for soil and water conservation, 1984 (C*** E* F* S*)
55.	Guidelines: land evaluation for irrigated agriculture, 1985 (E* F* S***)
56.	Soil management: compost production in tropical and subtropical environments, 1987 (E* F* S***)
57.	Soil and water conservation in semi-arid areas, 1987 (E* F*)
58.	Guidelines: land evaluation for extensive grazing, 1988 (E***)
59.	Nature and management of tropical peat soils, 1988 (E*)
60.	Soil conservation for small farmers in the humid tropics, 1989 (E* S***)
61.	Radioactive fallout in soils, crops and food, 1989 (E* F***)
62.	Management of gypsiferous soils, 1990 (E*)

A - Arabic	* Available
C - Chinese	** Out of print
E - English	*** In preparation
F - French
S - Spanish