Premium
Adsorption and degradation of thiazopyr in compost‐amended and non‐amended soils
Author(s) -
Fernández María D,
SánchezBrunete Consuelo,
Rodríguez Alvaro J,
Tadeo José L
Publication year - 2001
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.320
Subject(s) - compost , soil water , chemistry , freundlich equation , amendment , environmental chemistry , sorption , adsorption , degradation (telecommunications) , sewage sludge , incubation , sewage , agronomy , environmental engineering , environmental science , soil science , biology , telecommunications , organic chemistry , political science , law , computer science , biochemistry
Adsorption and degradation of thiazopyr on two unamended soils and a soil amended annually during 8 years with compost were studied under laboratory conditions and compared with the results obtained on soils amended with fresh sewage sludge compost. The adsorption isotherms fitted the Freundlich equation well and a marked sorption increase was found in amended soils. Degradation data followed first‐order kinetics and thiazopyr had a half‐life of about 75 days at 25 °C and 60% water‐holding capacity of soil. The addition of fresh compost markedly decreased the rate of thiazopyr degradation, whereas the compost mineralised in the field after annual additions had only a small influence. Incubation studies with sterile soils showed a very significant decrease of the degradation rate, indicating that degradation by micro‐organisms was the main pathway of thiazopyr degradation in the soils studied. © 2001 Society of Chemical Industry