Fig. 4. Yield of sunflower crops of different cultivars plotted against their average plant height at harvest. Open symbols correspond to 34 cultivars grown in Junín, Argentina (1995–1996). Closed symbols correspond to 24 cultivars grown in Pergamino, Argentina (1996–1997). Regression lines correspond to least squares fit significant at P < 0.01 (Junín) and P < 0.05 (Pergamino).