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

Figure 1

Inhibition of pigweed germination and growth by extracts of four field grown rye varieties, harvested at five different dates (Julian dates) during the spring of the first year of experiments. D₅₀ is the concentration required to cause 50% growth inhibition. Significant differences over time within each variety according to the Tukey-Kramer method () are indicated by different letters. Vertical bars represent standard errors at each sampling date.