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난지형 잔디에 사용되는 덧 파종 초종으로는 퍼레니얼라이그래스가 대표적으로 이용되어 왔다. 그러나 덧 파종된 퍼레니얼 라이그래스는 여름철이 되어도 기존잔디와경합에서 살아남는 개체가 많아 잔디 표면의 균일성을 떨어뜨리는 경우가 많으므로 인위적인 제거가 필요하다. 한국잔디는 Kerb에 의한 영향을 거의 받지 않은 반면에 퍼레니얼 라이그래스는 Kerb처리에 의하여 생육감소가 많았고 고사한 신초의 비율이 많이 높아지는 것으로 보아 퍼레니얼 라이그래스를 제거하기 위해서는 Kerb를 처리함이효과적인 것으로 판단된다. 차광은 정도에 따라 영향은 다르지만 퍼레니얼 라이그래스의 생육을 향상시키고 Kerb에 의한 영향을 감소시켰다. 차광률이 75% 정도 되는 그늘에서는 Kerb 처리량이 0.4 g·m^(-2)이상이 되어야 퍼레니얼라이그래스에서 고사되는 신초의 비율이 높고 생육이 감소되는 것으로 나타났다. 따라서 햇빛의 투과량이 적은 그늘 조건하에서는 Kerb의 처리농도가 기준량 보다 더 높아져야 퍼레니얼 라이그래스를 효과적으로 제거할 수 있을것으로 예측된다.


In order to investigate an artificially transition method of perennial ryegrass(Lolium perenne L. 'Accent') overseeded on zoysiagrass (Zoysia japonca 'Zenith') with Kerb ((3,5-jichloro-N (1,1-dimethyl-2-propynyl). We observed turfgrass growth and physiological responses of the two turfgrasses under the shading treatments. The experiment was conducted in greenhouse during April- August. Shading was generally using a black shade net product whose the shade level was done into 0, 35 and 75%, actual light intensities were 589, 378 and 135 μmol·m^(-2)·s PAR, respectively. The four levels of Kerb treatment were 0, 0.1 0.2, and 0.4 g·m^(-2). As shading was getting increased,growth of perennial ryegrass was increased slowly, but zoysiagrass was reduced and almost all of experiments showed significant differences statistically. Perennial ryegrass exhibited inclination that growth was reduced in more than Kerb 0.4 g·m^(-2) by shades. On the other hand, it was shown that the growth of zoysigrass was reduced by shades largely and it was not effected by Kerb. Through this study, it was determined that Kerb is effective for elimination of overseeded perennial ryegrass on zoysiagrass. Moreover, when excluding perennial ryegrass under the condition like shade, it is desirable for treating high concentration more than the basic processing amount.