Korean Journal of Weed Science (한국잡초학회지)

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Herbicidal Efficacy Affected by Different Formulation of Benzobicyclon-Mixtures Herbicides in Paddy Rice Field

Benzobicyclon 혼합제의 제형에 따른 제초활성 특성

  • Received : 2011.12.06
  • Accepted : 2011.12.16
  • Published : 2011.12.31
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Abstract

Sulfonylurea herbicide-resistant weeds are spreading widely and distributed about 106,951 hectare in paddy rice fields in Korea. Morever all biotype of Scirpus juncoides which were collected at 69 spots all over paddy rice fields in 2008 were identified biotype of sulfonylurea herbicide-resistant. Benzobicyclon is a p-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor, which is absorbed through root and basal stem of weeds so cause bleaching of newly developing leaves. Benzobicyclon was very effective to control Scirpus juncoides, Monochoria vaginalis, sedges and broadleaves weeds, so it have been developed various formulation like a suspension concentrate (SC), a water dispersible granule (WG), a granule (GR) and a DT (tablet for Direct application). During recently 6 years, benzobicyclon-mixtures herbicides have been registered over than 54 products in paddy fields. Herbicidal efficacy by formulations of benzobicyclon and its mixture herbicides were highest in DT, followed by SC and GR. Herbicidal efficacy of the kaolin and $CaCO_3$ carrier of GR was better and stable than that of talc and bentonite carrier. Growth and yield of rice were not affected much by formulations, application rates and rice cultivation methods.

Benzobicyclon은 HPPD활성을 억제하여 plastoquinone의 생합성을 저해하며 최종적으로 carotenoid 합성을 억제하고 대상잡초는 백화현상(bleaching)을 거쳐 고사하게 된다. 본 시험은 저항성잡초에 대한 benzobicyclon의 제형별, 증량제 종류별 제초활성을 비교하기 위하여 실시하였다. 폿트 시험에서 SU계 제초제 저항성 올챙이고랭이에 대한 benzobicyclon의 제형별 제초활성은 SC가 GR보다 높게 나타났고 이러한 결과는 시험포장에서도 동일하였는데, 이는 SC의 평균입경이 GR보다 작기 때문이다. 또한 평균입경이 동일한 benzobicyclon 혼합제의 DT와 GR간의 제초활성은 차이는 용출속도에 의해 차이가 나타났다. Benzobicyclon 혼합제 GR를 분쇄방법을 통해 유효성분의 평균입경을 각각 다르게 하여 제초활성을 비교시 습식분쇄를 거쳐 평균입경을 작게 한 GR-II의 제초활성이 높았다. 또한 건식분쇄를 거쳐 증량제를 talc와 bentonite로 사용한 GR-I보다 증량제를 $CaCO_3$와 kaolin을 사용한 GR-III의 제초활성이 10% 높았다. Benzobicyclon 성분을 습식분쇄하여 제형화한 GR의 제초활성이 높은 이유는 benzobicyclon 성분의 평균 입경이 작아 유효성분의 용출이 신속하게 이루어졌기 때문이고, 증량제의 종류에 따른 용출 차이는 benzobicyclon의 광물질의 종류에 따라 흡착(결합)력이 다르기 때문이다. Benzobicyclon 혼합제의 스크린 사이즈가 1mm인 GR-I와 0.7mm인 GR-IV간의 효과차이는 10% 이내이었다.

Keywords

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