TY  - GEN
AU  - Powers , Laura E.
AU  - McSorley , Robert 
TI  - Ecological principles of agriculture
SN  - 9780766806535
U1  - 577.55 
PY  - 2000///
CY  - Africa
PB  - Delmar Thomson Learning
KW  - ECOLOGY
KW  - AGROECOSYSTEM
KW  - NUTRIENT
KW  - CYCLING
KW  - DECOMPOSITION
KW  - TROPICAL AGRICULTURE
KW  - BIOCHEMISTRY
ER  -