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Allelopathic activities of compounds on seeds and seedlings of lettuce. Notes: 
GR, germination rate; 
GP, germination potential; 
RL, radicle length; 
SL, shoot length; 1-Hex: 1-hexanol; 2-Hex: (E)-2-hexenal; 2,4-Dec: (E,E)-2,4-decadienal; Hex: hexanal; Eug: eugenol.
