TY  - WP
AU  - Byerlee,D.
AU  - Siddiq, A.
TI  - Sources of growth in wheat yields in Pakistan's Punjab, 1965-2000: is there a sustainability issue?
T2  - CIMMYT Economics Working Paper
PY  - 1990///
CY  - Mexico
PB  - CIMMYT, 
KW  - Economics
KW  - AGROVOC
KW  - Fertilizer application
KW  - High-yielding varieties
KW  - Plant production
KW  - Plant response
KW  - Yields
N1  - Open Access; Tables, graphs, references p. 26-27, appendix p. 28
UR  - http://hdl.handle.net/10883/1145
ER  -