A factorial experiment laid out in completely randomized design (CRD) to examine the combined effects of glyphosate and cypermethrin on basal respiration (BR) and mineralization quotient (qM) of soil samples collected from an agro ecosystem was conducted under controlled laboratory conditions. The insecticide was applied to the soil at two field recommended rates (75 and 100 g a.i/ha) and the herbicide at 1.44 kg a.i./ha. The incubation study was carried out using soil samples maintained at 60 % water holding capacity at room temperature for 12 weeks. The main effects of cypermethrin appeared as transient inhibition, which was followed by mild stimulation of basal respiration and mineralization quotient of soil samples. However, whether in sole application, or judging from its contributions from treatment combinations, glyphosate engendered stimulatory effects on carbon mineralization. Results further showed that the interaction between the herbicide and insecticide produced stimulation of soil microbial activity from the beginning to the end of incubation. It is therefore presumed that the degradation of glyphosate in soil may confer a co-metabolic influence on the cypermethrin insecticide in soils.
PAPER TITLE :INTERACTION EFFECTS OF GLYPHOSATE AND CYPERMETHRIN ON SOIL BASAL RESPIRATION AND CARBON MINERALIZATI
APPLIED TROPICAL AGRICULTURE | VOLUME 21 NUMBER 1 2016
- Author(s) : Adejoro, S. A