Content of tocopherols in soybean seeds and soybean callus cv Felix: (a) α tocopherol; (b) γ tocopherol; and (c) δ tocopherol. S1—conventional soil system: plow + seedbed preparation with rotary harrow + seeding + fertilizer, no herbicide. S2—conventional soil system: plow + seedbed preparation with rotary harrow + seeding + fertilizer + S-metolachlor 960 g/L, imazamox 40 g/L and propaquizafop 100 g/L, with 1.5 L/ha, 0.8 L/ha, and 1.5 L/ha. S3—conventional soil system: plow + seedbed preparation with rotary harrow + seeding + fertilizer + dimethenamide 720 g/L, bentazone 480 g/L and fluazi-fop-P-butyl 150 g/L, with 1.2 L/ha, 2.5 L/ha, and 1.5 L/ha. The values shown are means ± S.E. Different lowercase letters indicate significant differences between the means of the three weed control systems within every medium and soybean seeds. Capital letters indicate significant differences between the means of all analyzed callus samples and the soybean seeds according to Tukey’s HSD test (p ˂ 0.05).