Spiny Cocklebur⁽¹⁾

C. Lambsquater⁽²⁾

Purslane⁽³⁾

Hairy Grass⁽⁴⁾

Knotweed⁽⁵⁾

Weed density (pl∙m⁻²)

0.6

1.6

0.6

0.4

0.4