TY  - BOOK
AU  - JOHNSON, C B
TI  - Physiological processes limiting plant productivity
U1  - 581.1:631.524.84 
PY  - 1981///
CY  - London
PB  - Butterworth
KW  - Crop physiology
KW  - Plant productivity
KW  - Symbiotic nitrogen fixation
KW  - Water stress
ER  -