Abstract:
A field experiment was conducted at On-farm research station, Rangpur, BAR I during rabi season of
2005-06 and 2006-07 to find out the optimum rate of herbicides and time of application against weeds in
potato fields. Herbicides Panida 33 EC (pendimethalin) and Neon 70 WG (metribuzin) were evaluated
through post planting pre-emergence and post emergence (9 days after planting) spraying with different
rates on weed management in potato fields. Post planting post emergence spraying of Panida 33 ECC
and Neon 70 WP controlled all broad leaf weeds. Among the different rates of herbicides Panida 33 EC
@ 10 up to 3.0 liter and Neon 70 WG @ 750 up to 1000g ha showed similar results in controlling
broad leaf weeds particularly of Chenopodium album (Bathua), Amaranthus viridis (Shaknotey),
Alternanthern philoxeroides (Maloncho). Lindernia anagallis (Panigas), Gnaphulium affine
(Bonocopy), Om/is europea (Amrul) and Glil/IIS lotoides (Carpet agacha). Yield of potato tubers in the
year 2005-06 was significantly increased up to 51 and 49 % over control by spraying Panida 33 EC @
3.0 liter and Neon 70 WG @ 1000 g ha", respectively at 9 DAP. Similar result was also observed by
spraying Panida 33 EC @ 1.0 liter and Neon 70 WG @ 750 g ha'. In the year 2005-06. the highest tuber
yield (21.24 t ha") was recorded from weed free plot which was statistically similar with post emergence
Panida 33 EC @ I I ha (19.00 t ha") and post emergence neon 70 WG @ 750 g ha (20.16 t ha').
Similar trend was also observed in next year. Post planting post emergence (9 DAP) spraying of Panida
33 EC @ 1.0 I ha and Neon 70 EC @ 750 g ha in potato fields are most effective in controlling
broad leaf weeds like Chenopodium album, Amaranthus viridis, Alternanthera philoxeroides.
Gnaphalum affine. Oxalis europca and Glinus lotoides.
