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Effect of Seeding Method and Pre-emergence Herbicides on Plant Growth and the Production of Sorghum × Sudangrass Hybrid

파종 방법과 토양처리용 제초제 처리가 수수 × 수단그라스 교잡종의 생육 및 생산성에 미치는 영향

  • Jung, Jeong Sung (National Institute of Animal Science, Rural Development Administration) ;
  • Lee, Ki-Won (National Institute of Animal Science, Rural Development Administration) ;
  • Choi, Ki Choon (National Institute of Animal Science, Rural Development Administration) ;
  • Ji, Hee Jung (National Institute of Animal Science, Rural Development Administration) ;
  • Park, Hyung Soo (National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Won Ho (National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Young-Jin (National Institute of Animal Science, Rural Development Administration) ;
  • Lee, Sang Hak (National Institute of Animal Science, Rural Development Administration) ;
  • Lee, Sang-Hoon (National Institute of Animal Science, Rural Development Administration)
  • Received : 2015.02.16
  • Accepted : 2015.03.10
  • Published : 2015.03.31

Abstract

The following experiments were used to evaluate the effect of seeding method and pre-emergence herbicides on weed control and the production of the $sorghum{\times}sudangrass$ [sorghum bicolor (L.) Moench] hybrid under field and in vitro conditions. Under the in vitro condition, we evaluated how different kinds of herbicides affect the rate of seed germination and the growth of early seedlings in the $sorghum{\times}sudangrass$ hybrid treated with herbicides. Simazine, alachlor, and methabenzthiazuron were used, and their concentration levels were 0%, 40%, 70%, and 100%. The germination ratio of the seeds was reduced by the application of simazine, methabenzthiazuron, and alachlor compared with the control (distilled water). The alachlor application severely decreased the sorghum germination ratio. However, seed germination was not greatly influenced by the concentration level of the herbicides. Root and shoot length were increased in the following order: control > simazine > methabenzthiazuron > alachlor. Overall, alachlor significantly reduced root length more than shoot length. The differential tolerance of the $sorghum{\times}sudangrass$ hybrid to pre-emergence herbicides by seeding method was then tested under the field condition. The plants were severely injured by the alachlor application, leading to a great reduction in the number of stems. However, for the simazine and methabenzthiazuron applications the number of stems lost was slightly lower than it was for the alachlor and simazine + alachlor applications. In the seeding method, drilling was more effective in reducing herbicide injury than broadcasting. All of the herbicides effectively controlled weeds. The simazine and methabenzthiazuron applications showed a significantly higher dry matter (DM) yield. However, the alachlor and simazine + alachlor applications severely reduced the DM yield. This result suggests that the alachlor application has a significant effect on plant production. Similarly, the total digestible nutrient (TDN) yield was greatly reduced by the alachlor and simazine + alachlor applications. From the results presented above, we concluded that the yield of DM was the highest for broadcasting with no herbicide. and drilling was the most-effective way to reduce herbicide injury. The simazine application was the most-effective herbicide, showing the highest forage yield and TDN yield.

Acknowledgement

Grant : 하계사료작물 생산성 향상 재배기술개발

Supported by : 농촌진흥청

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