China: azolla propagation and small-scale biogas technology: report on an FAO / UNDP study tour to the People's Republic of China, 21 May-11 June 1978
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| Format: | Book |
| Published: |
Rome :
Food and Agriculture Organization of the United Nations ,
1978
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| Series: | FAO soils bulletin; 41
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| Subjects: | |
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Nitrogen fixation in Indian rice fields : azolla and blue green algae
