TY  - REP
AU  - Byerlee,D.
AU  - Heisey,P.W.
AU  - Heisey,P.W.
TI  - Wheat varietal diversification over time and space as factors in yield gains and rust resistance in the Punjab
PY  - 1990///
CY  - Mexico, DF (Mexico)
PB  - CIMMYT
KW  - Breeding
KW  - AGROVOC
KW  - Data collection
KW  - Disease resistance
KW  - Diversification
KW  - Economics
KW  - Pakistan
KW  - Spacing
KW  - Timing
KW  - Varieties
KW  - Yield factors
KW  - Yield forecasting
KW  - Wheat
ER  -