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Collection and identification of predominant weeds were done from the rice field of Bapatla. Out of
different species, 10 weed species were identified as predominant, constituting 90% of the weed
population. The weed control treatments consists of hand weeding @ 20&40 DAT, Oxadiargyl
@100 g ha-1 pre emergence as sand mix application (SMA) fb 2,4-D sodium salt @ 0.8 kg ha-1 as
post emergence and orthosulfamuron at different doses (80 g ha-1, 120 g ha-1) and times of
application (pre-emergence alone, post-emergence alone and sequential). Among different weed
management treatments the results reveal that the orthosulfamuron @ 120 g ha-1 pre-emergence as
SMA at 3-5 DAT fb orthosulfamuron @120 g ha-1 as post-emergence at 25-30 DAT (T11) found to
be effective and economical in managing weeds in rice grown under transplanted conditions
without any crop injury as an alternative to manual weeding and it was on par with other sequential
treatments T10, T9, T8, T3 and also with hand weeding.
Keywords: Orthosulfamuron, Transplanted rice, Sequential application