International Journal of Agronomy

Research Article

Management Options and Factors Affecting Control of a Common Waterhemp (Amaranthus rudis) Biotype Resistant to Protoporphyrinogen Oxidase-Inhibiting Herbicides

Figure 2

Preemergence height reduction of common waterhemp with acifluorfen at 420 g/ha ( 𝑦 = − 1 . 7 4 5 6 𝑥 2 + 4 . 1 7 6 6 𝑥 + 8 . 6 6 3 8 , 𝑅 2 = 0 . 9 9 ), flumioxazin at 72 g/ha ( 𝑦 = 2 . 4 6 7 3 𝑥 2 − 2 6 . 8 8 5 𝑥 + 8 5 . 8 2 , 𝑅 2 = 0 . 9 4 ), fomesafen at 330 g/ha ( 𝑦 = − 2 . 3 4 7 1 𝑥 2 + 5 . 8 1 3 1 𝑥 + 6 1 . 1 9 1 , 𝑅 2 = 0 . 9 7 ), lactofen at 220 g/ha ( 𝑦 = 0 . 1 5 9 3 𝑥 2 − 8 . 6 0 9 7 𝑥 + 3 6 . 8 7 5 , 𝑅 2 = 0 . 9 9 ), sulfentrazone at 240 g/ha ( 𝑦 = − 0 . 3 4 2 6 𝑥 2 − 1 1 . 3 9 4 𝑥 + 8 7 . 7 4 , 𝑅 2 = 0 . 9 8 ), atrazine at 1680 g/ha ( 𝑦 = − 2 . 4 5 0 1 𝑥 2 − 0 . 5 9 5 𝑥 + 7 3 . 8 0 5 , 𝑅 2 = 0 . 9 9 ), imazethapyr at 70 g/ha ( 𝑦 = − 0 . 9 4 0 1 𝑥 2 + 5 . 1 2 1 4 𝑥 − 1 . 0 4 3 5 , 𝑅 2 = 0 . 6 7 ), and isoxaflutole at 70 g/ha ( 𝑦 = − 0 . 2 0 1 5 𝑥 2 − 7 . 6 1 3 3 𝑥 + 7 5 . 0 0 9 , 𝑅 2 = 0 . 8 0 ) 28 days after planting when planted 0, 2, 4, and 6 weeks after application. The vertical line represents the LSD ( 𝑃 = 0 . 0 5 ).
514765.fig.002