National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The activity of dehydrogenase (µg TPF produced g-1 day-1) followed decreasing trend from before treatment imposition to 3 days after treatment imposition thereafter it showed increasing trend. Sulfonyl urea herbicides had the lower dehydrogenase activity immediately after herbicide application as compared to the other herbicide group’s viz., chloroacetamide, triazolepyramidine, pyramidinethiobenzole and aryloxyphenoxy propionate. Urease activity (mg of NH4+ released g-1 soil 2 hr-1), increased from 0 DAT up to 45 DAT and thereafter it decreased. There was slight initial depression in the urease activity 3 days after application in every treatment. With the progress of time by 15-20 DAT herbicide treated plots recorded on par results with weedy check (control). Further at 23 DAT, herbicide treated plots recorded significantly higher urease activity than control during both the years of study. Activity of acid phosphatase and alkaline phosphatase (ïÂÂg of PNP released g-1 soil h-1) increased from 0 DAT to 45 DAT, thereafter the activity decreased. At 6 DAT and 15 DAT the higher acid phosphatase activity was recorded in weedy check (T14) which was on par with hand weeding twice at 25 and 45 DAT (T13). The reduction in acid phosphatase activity is in the range of 15 % and 20% over control during 2013 and 2014 respectively. Detracting effect of herbicides towards enzyme activities decreased with time. Except a slight depression initially the tested herbicides at field rate was non-inhibitory for prolonged period.
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