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Carbon source and time dependent enhancement of aerobic nitrogenase activity in soil samples and soil cores of cereals by Alachlor, Carbofuran and 4‐nitrophenol
Author(s) -
Berggold R.,
Krotzky A.,
Jäger D.,
Dart P. J.,
Werner D.
Publication year - 1983
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19831460512
Subject(s) - rhizosphere , incubation , carbofuran , nitrogenase , alachlor , incubation period , chemistry , agronomy , environmental chemistry , nitrogen fixation , zoology , biology , pesticide , atrazine , nitrogen , biochemistry , bacteria , genetics , organic chemistry
Aerobic nitrogenase activity (acetylene reduction test) in rhizosphere from Pearl Millet is enhanced by a factor of 2 during a 36 h incubation period by concentrations of the herbicide Alachlor and also the insecticide Carbofuran as used in the field. Supplementing soil with sucrose increased this enhancement effect to a 2‐to 4‐fold stimulation. The increase of nitrogenase activity in intact soil cores from Pearl Millet by Alachlor during a 5 h incubation period is about 30 to 40%. Aerobic nitrogenase activity in soil sediments is enhanced by concentrations of between 10 −5 and 10 −6 mol · 1 −1 4‐nitrophenol but only within an incubation period of 3 to 4 days. These enhancement effects are discussed in terms of carbon source and incubation period.