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Changes of Weedy Rice Occurrence in Repeated Wet Direct Seeding and Alternate Transplanting/Wet Direct Seeding of Rice

벼 무논점파재배 연작과 이앙전환에 따른 잡초성벼 발생 양상

  • Received : 2013.11.15
  • Accepted : 2013.12.09
  • Published : 2013.12.31

Abstract

Weedy rice is one of the major problems in direct-seeded rice field, resulting in poor rice quality and low grain yield. This study was carried out to evaluate the conversion effect to machine transplanting after wet-direct- seeding for 3 years on weedy rice occurrence, in comparison of repeated wet-direct-seeding. Occurrence of weedy rice in the continuous wet-hill-seeded and broadcasted field for 3 years increased 4 folds, when compared with that in machine transplanted rice paddy. In the first year of wet-direct-seeded field converted from machine transplanting, weedy rice occurrence did not increase, demonstrating lesser weedy rice in wet-hill-seeded than broadcasted field. These results indicate that alternate cultivation of wet-hill-seeding and machine transplanting is more effective to prevent weedy rice occurrence than the repeated wet-direct-seeding method for 3 years.

본 연구는 벼 무논점파재배에 따른 잡초성벼 발생율을 담수산파 및 기계이앙재배와 비교하고, 무논점파와 담수산파재배포장을 기계이앙으로 전환하였을 때 잡초성벼 발생양상을 알아보기 위하여 실시하였다. 2년 연속 무논점파 및 담수산파 재배할 경우, 잡초성벼 발생은 기계이앙보다 각각 2.5배 및 12배 증가하였다. 그리고 3년간 연속하여 무논점파와 담수산파로 재배한 논에서 잡초성벼는 기계이앙보다 각각 4.2배, 4배 증가하였다. 무논점파 및 담수산파를 3년간 연작 후 기계이앙 재배로 전환한 논에서 잡초성벼 발생은 전년도에 비해 각각 0.3배, 0.7배 감소하여, 담수표면산파보다 무논점파에서 감소율이 더 큰 것으로 나타났다. 기계이앙재배로 3년간 연작한 포장을 다음해 무논점파와 담수산파하였을 경우는 잡초성벼 발생이 각각 전년도에 비해 0.8배, 1.1배로 기계이앙재배시에 비해 증가하지 않았다. 이와 같은 결과로 보아 잡초성벼 발생을 최소화하기 위해서는 직파재배 할 경우 담수산파보다는 무논점파가 유리하나 2년 이상 연작은 피하고, 기계이앙재배와 무논점파를 번갈아 하는 것이 잡초성벼 발생을 줄이는 재배방법으로 생각된다.

Keywords

References

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