TY  - VF
TI  - Hybrid vigor : : key to abundance
PY  - 1973///
CY  - Iowa : 
PB  - Pionner Hi-Bred International, Inc., 
KW  - Heterosis
KW  - AGROVOC
KW  - Pollination
KW  - Germination
N1  - Credits: narrator, Dave McElhatton ; writing and photography, John Knoop ; music, Vince Pitelka ; additional photography, Joe Munroe, John Blaustein ; hybrid vigor drawings, Kent Hodgetts ; film and sound editor, John Blaustein ; post production consultant, Marvin Becker ; ultraphot/nomarski microscopy euqipment courtesy, Carl Zeiss, Inc
N2  - Explanation about the heterosis process and other activities of animal reproduction realized in the Pionner International's instalations
ER  -