Alaa El-Dein Omara And Ahmed El-Ghandor( 2018). Effect Of Thiobencarb And Penoxsulam Herbicides On Soil Microbial Population
And Weed Control In Transplanted Rice
Global Advanced Research Journal Of Microbiology (ISSN: 2315-5116) Vol. 7(5)
Pp. 084-094, July, 2018 Issue
Abstract: The present study was to investigate the effect of two herbicides, thiobencarb
50% EC and penoxsulam th th 24% SC at their recommended field rates on soil
microbial population at regular intervals i.e. 4 to 28 day after treatment, control of weeds and crop yield of transplanted rice. From each plot, five soil subsamples were collected randomly and Thoroughly mixed to form one composite sample.Results showed that the counts of total Aerobic bacteria dramatically decreased with lapse of time after th -1 th -1 treatment which Decreased from 4 Days
(6.01 Log CFU Ml ), To 28 Days (5.72 Log CFU Ml ), During th -1 2016 season,
and from 4 days (6.39 log CFU ml ), to 28 day (5.41 log CFU ml ), during 2017
seasons. Also, The higher enumeration of N2-fixing bacteria, N2-fixing Cyanobact
eria and sulphate reducing th bacteria were recorded from 4 to 12 , then
decreaseng to 28 days after treatment. Also, the counts of th nitrifiers bacteria, showed increased up to 16 Days after treatment, then decreased thereafter. Also, high significantly affected by weed control treatments. Application of penoxsulam recorded the lowest value of Echinochloa crus-galli, Echinochloa colona total weeds dry weight and achieved the highest number of panicles and grain yield as compared to weedy check, which gave the highest value of total weeds dry weight and the lowest rice yield characters. penoxsulam was observed to be less toxic than thiobencarb against microbial enumeration, best weed control
and increase rice yield.
Keywords: (Microbial populations; Thiobencarb; Penoxsulam; Weeds; Rice )
