Vol. 8 No. 1
Effect of pendimethalin and oxyfluorfen on soil enzyme activity
Author(s): A. SIREESHA, P. C. RAO, C. S. RAMALAXMI AND G. SWAPNA
Abstract: A field experiment was conducted to study the effect of pendimethalin and oxyfluorfen on soil enzyme activities in raddish crop. There was significant difference observed in acid, alkaline phosphatase and dehydrogenase activities between the herbicide treatments and periods of study and their interaction. Acid, alkaline phosphatase and dehydrogenase activity was found to be increased from 0 days after application to 30 days after application (DAA) all the treatments and there was a decrease at the time of harvest. In the two seasons of study, phosphatases and dehydrogenase showed maximum activity at 30 DAA. The interaction effect (treatments and DAA) showed that the acid, alkaline phosphatase and dehydrogenase activity in the herbicide treated plots was significantly higher than the control among all the periods. Lower level of herbicide application increased enzyme activity as compared to higher dose of herbicide. Oxyfluorfen @ 0.15 kg a.i ha-1 showed inhibitory effect on enzyme activity where as urease levels in the herbicide treated plots were significantly lower than the control for all the growth stages.
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