Vol. 12 No. 2
Effect of weed management practices on soil actinomycetes and fungi population under different crops
Author(s): D. NONGMAITHEM AND D. PAL
Abstract: Field experiment was carried out duringrnpre-kharif season of 2010 and 2011at the Instructional Farm, BCKV, Mohanpur,rnNadia, West Bengal. The experiment was laid in split plot design replicatedrnthrice, keeping three crops under the main plot treatment, C1:rnSesame, C2: Green gram, C3:  Black gram and nine weed managementrntreatments (W) in the sub-plot treatments, W1:rnUntreated control, W2: Hand Weeding at 20 DAS, W3:rn5% (w/v) Ageratum conyzoides aqueous extract, W4:  5 % (w/v ) Blumea lacera aqueous extract, W5:rn5% (w/v) Ocimum sanctum aqueous extract, W6:  5 % (w/v) Physalis minima aqueous extract, W7:rn5% (w/v) Amaranthus tricolor aqueous extract, W8:rnQuizalofop-p-ethyl 5 EC @ 50g ha-1 atrn20 DAS, W9: Fenoxapropp-ethyl 9 EC @rn30 g ha-1 at 20 DAS. Results revealedrnthat at the initial period of spraying, the aqueous plant extract treatmentsrnresulted in decline in the population of soil micro flora. However, with thernadvancement of time, there was increase in population in all the weedrnmanagement treatments except for the chemical herbicide treatments where therernwas decrease in the population of both the micro flora.
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