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01 Introduction: science and biotechnology Low High 2:35:41 1 
02 Introduction: soil and soil microbiotechnology Low High 2:22:22 1 
03 Biological N2-fixation: biotechnology Low High 2:24:08 1 
04 Symbiotic N2-fixation: theory, structure and function Low High 2:27:34 1 
05 Symbiotic N2-fixation:isolation, purification, identification and application Low High 2:20:29 1 
06 Nonsymbiotic N2-fixation: isolation, purification, identification and application Low High 2:22:07 1 
07 Associative N2-fixation: isolation, purification, identification and application Low High 1:54:40 1 2 
08 Rhizosphere microorganisms: isolation, purification, identification and application Low High 2:28:37 1 
09 Cynobacteria: development and application Low High 2:11:27 1 
10 Azolla: development and application Low High 2:29:30 1 2 
11 P-solubilizing microorganism: Inorganic PSM Low High 2:24:12 1 
12 P-solubilizing microorganism: Organic PSM Low High 2:31:49 1 2 
13 Mycorrhiza: development and application Low High 2:27:34 1 
14 Composting: development and application Low High 2:39:18 1 
15 Compositing-free technology: development and application Low High 2:26:47 1 
16 Biofertilizer: development and application Low High 2:24:56 1 2 3 

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