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Decomposition of 2,4‐dichlorophenoxyacetic Acid in Soil and Liquid Media
Author(s) -
Newman Arthur S.,
Thomas James R.
Publication year - 1950
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1950.036159950014000c0035x
Subject(s) - decomposition , citation , chemistry , computer science , library science , organic chemistry
THE disappearance of 2,4-dichlorophenoxyacetic acid (2,4-D) and other plant growth-regulators from soils has been shown to be due to microbial action. Martin (6) inoculated sterile media, containing 2,4-D as the only source of energy, with fresh soil and soil previously incubated with 2,4-D and then measured CO2 evolution. Less CO2 was evolved from media inoculated with fresh soil than with previously incubated soil. The quantities of CO2 evolved were sufficient to indicate that 2,4-D is decomposed to a certain extent by soil microorganisms. Brown and Mitchell (2) found that the inactivation of 2,4-D was greater in nonautoclaved soil than in autoclaved soil. DeRose and Newman (3) showed that there was no detectable decrease in the biological activity of 2,4-D and other plant growthregulators in autoclaved soils during 9 to 15 weeks incubation, whereas, all activity had disappeared in nonautoclaved soils in 3 to 6 weeks. These results indicate that microbial decomposition is the principal factor involved in the disappearance of growth-regulators from soil.