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Clomazone

Clomazone is an agricultural herbicide, and has been the active ingredient of products named Command and Commence. The molecule consists of a 2-chlorobenzyl group bound to a nitrogen-oxygen heterocycle called a isoxazolidinone. It is a white solid.

Clomazone was first registered by the USEPA on March 8, 1993, and was commercialized by FMC Corporation. It is used for broadleaf weed control in several crops, including soybeans, peas, maize, rapeseed, sugar cane, cassava, pumpkins and tobacco. It may be applied pre-emergence of incorporated before planting the crop. Clomazone is relatively volatile (vapor pressure is 19.2 mPa) and vapors induce striking visual symptoms on non-target sensitive plants. Clomazone undergoes biological degradation, exhibiting a soil half life of one to four months. Adsorption of the herbicide to soil solids slows degradation and offgassing. Encapsulation helps reduce the compound's volatility and therefore reduces off-target damage to sensitive plants.

Clomazone suppresses the biosynthesis of chlorophyll and other plant pigments.

References

References

  1. Tomlin, CD. 1997. The pesticide manual, 11th edition. British Crop Protection Council. Farnham, Surrey, UK. p 256-257. {{ISBN. 978-1901396881.
  2. (1995). "Clomazone fate in soil as affected by microbial activity, temperature, and soil moisture". Journal of Agricultural and Food Chemistry.
  3. (1995). "Clomazone sorption in soil: Incubation time, temperature, and soil moisture effects". Journal of Agricultural and Food Chemistry.
  4. (1995). "Effects of Starch Encapsulation on Clomazone and Atrazine Movement in Soil and Clomazone Volatilization". Weed Science.
  5. Storzer, Werner. (2002). "The residue behaviour of new herbicides in crop plants". Nachrichtenblatt des Deutschen Pflanzenschutzdienstes.
  6. Gara, Pedro M. David; Rosso, Janina A.; Martin, Marcela V.; Bosio, Gabriela N.; Gonzalez, Monica C.; Martire, Daniel O.. (2011). "Characterization of humic substances and their role in photochemical processes of environmental interest". Trends in Photochemistry & Photobiology.
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herbicides 2-chlorophenyl-compounds isoxazolidinones group-13-herbicides
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