Evaluation location: North Dakota, United States
Oil concentration for wild accessions from the Bushland Collection 1976-1980. All analyses performed in 1982 on seeds from original population. Nuclear Magnetic Resonance (NMR) using 2 ml of dried seeds from wild Helianthus species (cultivated H. annuus uses 40 ml). This methodology is an acceptable technique for analysis. Oil concentration is expressed on a percent of dry weight basis.