Phytotoxicity and Benzoxazinone Concentration in Field Grown Cereal Rye (Secale cereale L.)

Figure 4

Inhibition of ryegrass germination and growth by extracts of three field grown rye varieties, harvested at five different dates (Julian dates) during the spring of the second year of experiments. D₅₀ is the concentration required to cause 50% growth inhibition. Values associated with the same letter are not significantly different according to the Tukey-Kramer method (). Vertical bars represent standard errors at each sampling date.