Effects of trifluralin on soil carbon mineralization at different temperature conditions


Sagliker H. A.

EUROPEAN JOURNAL OF SOIL BIOLOGY, cilt.45, ss.473-477, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 45
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.ejsobi.2009.06.005
  • Dergi Adı: EUROPEAN JOURNAL OF SOIL BIOLOGY
  • Sayfa Sayıları: ss.473-477

Özet

Trifluralin is a herbicide intensively used in Turkish cotton agriculture. The recommended field dose [(RFD), 480 g active ingredient 1(-1)], 2 x RFD, 4 x RFD and 6 x RFD of this herbicide were added to virgin (previously no trifluralin applied) and cotton field soils (previously trifluralin applied) from a district (Yumurtalik, Adana) under Mediterranean climate conditions in order to determine their effects on soil microbial activity as measured by carbon mineralization at the different temperature conditions (20 degrees C, 25 degrees C and 30 degrees C). C mineralization of all samples was determined by the CO2 respiration method over 30 days (20 degrees C, 25 degrees C and 30 degrees C at constant moist). The ratio (%) of carbon mineralization at all doses of cotton field soil at 30 degrees C was significantly higher than all other field dose-temperature combinations (P<0.001). Based on these results, trifluralin is used as a carbon source by soil microorganisms. The herbicide trifluralin was degraded completely in the cotton field but a small fraction remained in the virgin field. This result can be explained by the cotton field soil having both more active microbial populations and more microorganisms adapted to the trifluralin applications than the virgin field. (C) 2009 Elsevier Masson SAS. All rights reserved