TY  - BOOK
AU  - 
TI  - Nitrogen fixation in tropical cropping systems 
SN  - 0851988423
AV  - SB297.4 G31
PY  - 1993///
CY  - Wallingford
PB  - C.A.B  International
KW  -  
KW  - Nitrogen - Fixation
KW  - Cropping systems - Tropics
KW  - Soil biology
N1  - Subject Index
ER  -