PERFORMANCE OF METSULFURON METHYL 10% + CHLORIMURON ETHYL 2% ON WEED INHIBITION, GROWTH AND YIELD OF AROMATIC AMAN RICE VARIETIES

Abstract

The field experiment was conducted at the Agronomy field, Sher-e-Bangla Agricultural University (SAU), during July to December 2018 with a view to find out the performance of modern aromatic rice as affected by the herbicidal weed control method. Weed control methods viz.: W 0 – No herbicide Used (Control), W 1 – Metsulfuron methyl 10% + Chlorimuron ethyl 2% @ 15 g ha −1 , W 2 – Metsulfuron methyl 10% + Chlorimuron ethyl 2% @ 20 g ha −1 and W 3 – Metsulfuron methyl 10% + Chlorimuron ethyl 2% @ 25 g ha and 30 days old seedlings of V 1 - BRRI dhan70, V 2 - BRRI dhan79 and V 3 - BRRI dhan80 were transplanted on the well-puddled experimental plots on 04 August 2018 by using two seedlings hill −1 . The experiment was laid out in a split plot design with three replications. The size of the individual plot was 4 m × 2.5 m and total numbers of plots were 36. There were 12 treatment combinations. Herbicidal weed control was placed along the main plot and variety in the sub plot. The results revealed that number of days to weed emergence and number of weeds in a plot were significantly influenced by the different weed control treatments. The minimum number of days to weed emergence and maximum weed species m −2 were observed from the plot where no herbicides were used.On the other hand, the maximum number of days to weed emergence and minimum weed species m were observed from the plot where Metsulfuron methyl 10% + Chlorimuron ethyl 2% @ 20 g ha were used. Among the varieties The lowest number of weed species m iii −2 were observed from BRRI dhan79 plot. Different weed control treatments with varietal combination had significant effect on crop growth parameters and yield and yield-contributing characters of aromatic rice varieties. The tallest plant was observed from Metsulfuron methyl 10% + Chlorimuron ethyl 2% @ 15 g ha −1 and BRRI dhan79 (123.10 cm). The highest effective tiller (18.87), longest panicle (35.81 cm), maximum total filled grain panicle −1 (97.97), maximum number of filled grain panicle −1 −1 −2 (86.46), highest weight of 1000-grain (29.24 g), highest grain yield (6.24 t ha ), highest harvest index (68.25 %) and maximum days to weed emergence (24.33 days) was obtained from the combination Metsulfuron methyl 10% + Chlorimuron ethyl 2% @ 20 g ha −1 with BRRI dhan70. The combination of Metsulfuron methyl 10% + Chlorimuron ethyl 2% @ 20 g ha −1 and BRRI dhan70 showed better performance on growth and yield of rice under the present study.