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芝麻土壤施镉的小区试验结果表明,土壤中镉低于1.2ppm有增产作用,高于2.0ppm则产生危害,土壤镉含量与芝麻籽粒产量和生物学产量符合一元二次方程。芝麻减产15％的土壤镉临界浓度为16ppm,籽粒镉含量达到食品卫生标准的土壤镉临界值为0.6ppm。植株镉累积系数为:根(1.13)>茎(0.84)>叶(0.45)>籽实(0.23)。大田植株镉累积系数为:根(1.35)>茎(0.61)>叶(0.39)>籽实(0.28)。芝麻年吸镉率为土壤镉的0.157％。
The plot experiment of soil applying cadmium in sesame showed that the cadmium production in the soil was lower than 1.2ppm, and the hazard was caused when the soil cadmium content was higher than 2.0ppm. The content of cadmium in the soil was consistent with the quadratic equation of sesame. The critical concentration of soil for 15% reduction of sesame was 16ppm, and the threshold value of soil Cd for grain cadmium content reached food hygiene standard was 0.6ppm. The accumulation coefficient of Cd in plants was root (1.13)> stem (0.84)> leaf (0.45)> seed (0.23). The accumulation coefficients of cadmium in field plants were: root (1.35)> stem (0.61)> leaf (0.39)> seed (0.28). The annual cadmium absorption rate of sesame is 0.157% of the soil cadmium.