Treatment

Fresh Leaf Weight (g)

RII

Interaction

Lettuce Control

51.47

Lettuce-Lettuce Above

40.68

−0.12

Facilitative

Onion-Lettuce Above

47.44

−0.04

Neutral

Lettuce-Lettuce Below

39.43

−0.13

Facilitative

Lettuce-Onion Below

70.13

0.15

Competitive

Lettuce-Lettuce Both

51.75

0.00

Slightly Competitive

Lettuce-Onion Both

70.71

0.16

Competitive