Abstract

A series of experiments was conducted to investigate the herbicidal activity of natural compound chrysophanic acid under the greenhouse condition in 16 weed species. Chrysophanic acid showed non-selective herbicidal activity. While chrysophanic acid exhibited severe injury by foliar treatment, little or no injury was found by the soil treatment. Among the tested weeds, the most effective activity was found in grass and broad leaf weeds, a lower significant difference in herbicidal activity was found in sedge. At early post-emergence, weeds appeared to be very susceptible to chrysophanic acid with $2,000{\mu}g\;mL^{-1}$. The higher the natural compound concentrations, the lower weed growth. At middle post-emergence, weeds appeared to be very effective to chrysophanic acid with $30,000{\mu}g\;mL^{-1}$.

Chrysophanic acid의 토양처리에 의한 살초효과는 없었으나, 경엽처리효과는 현저하였다. 잡초의 초기 경엽처리효과는 처리 17일 후의 살초효과가 가장 높았고, 처리 24일 후에는 그 효과가 유사하거나 다소 감소하는 경향이었다. 초종별 살초효과는 광엽과 화본과에서 높은 반면, 사초과 잡초에서 다소 낮은 것으로 나타났다. 초기 경엽처리시에는 $2,000{\mu}g\;mL^{-1}$, 중기 경엽처리에서는 $30,000{\mu}g\;mL^{-1}$ 처리시 살초효과가 우수하였다.

Keywords

• bioassay;
• chrysophanic acid;
• natural herbicide