|
41 |
China: azolla propagation and small-scale biogas technology, 1978 |
1978 |
Report |
|
|
40 |
China: recycling of organic wastes in agriculture, 1977 |
1977 |
Report |
|
|
39 |
Salt-affected soils and their management, 1988 |
1988 |
Report |
|
|
38 |
Soil and plant testing and analysis, 1980 |
1980 |
Report |
|
|
38 |
Soil and plant testing as a basis of fertilizer recommendations, 1980 |
1980 |
Report |
|
|
37 |
Improved use of plant nutrients, 1978 |
1978 |
Report |
|
|
35 |
Organic materials and soil productivity, 1977 |
1977 |
Report |
|
|
34 |
Assessing soil degradation, 1977 |
1977 |
Report |
|
|
33 |
Soil conservation and management in developing countries, 1977 |
1977 |
Report |
|
|
32 |
A framework for land evaluation, 1976 |
1976 |
Report |
|
|
|