TY  - BK
TI  - Official release of the first QPM hybrid variety Zhongdan 9409
PY  - 1999///
CY  - Beijing (China)
PB  - CASS, 
KW  - Agronomic characters
KW  - AGROVOC
KW  - China
KW  - Maize
KW  - Nutrient improvement
KW  - Protein content
KW  - Varieties
KW  - Zea mays
KW  - Hybrids
KW  - CASS
KW  - CIMMYT
ER  -