Effect of water management and weed control treatments on the performance of transplanted <i>aman</i> rice

Abstract

A study was conducted from June to December 2003 to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39) in different weed control treatments e.g. two hand weedings at 15 and 40 DAT; Weeding by BRRI Weeder at 20 and 40 DAT; Rifit 500EC @ 1L/ha at 7 DAT; Rifit 500EC @ 1 L/ha at 7 DAT and one hand weeding at 40 DAT; Butachlor 5G @ 2 kg/ha at 7 DAT; Butachlor 5G @ 2 kg/ha at 7 DAT and one hand weeding at 40 DAT along with weed free and unweeded check under both good and poor water management practices. Weed density, weed biomass and weed control efficiency were significantly influenced by different weed control treatments under both water management practices. Other than weed free treatment, Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DAT showed the best performance under good water management with minimum weed density (16 g/m 2 ) as well as weed biomass (9.27 g/m 2 ) and the highest weed control efficiency (82.57%). Yield and yield components were also significantly influenced by different weed control treatments and water management. The highest grain yield (5.22 t/ha) was obtained under good water management in weed free treatment followed by Butachlor 5G @ 2 kg/ ha and one hand weeding (4.96 t/ha) under same water management. Results revealed that integration of approaches, particularly Butachlor application along with one manual weeding accompanied by proper water management might be the best option to combat weed problems as well as to obtain satisfactory grain yield in transplanted aman rice.

Influence of date of transplanting on the growth and yield performance of high yielding varieties of Boro rice

“…The heaviest 1000-grain weight (22.07 g) was recorded in BRRI dhan69, which was at par with BRRI dhan74 and the lowest 1000-grain weight (20.29 g) was recorded in BRRI dhan28, which was statistically identical with BRRI dhan58. Similar results were reported by Kabir et al (2008) who noticed that the weight of 1000-grain varied among varieties. Weight of 1000 grains was also significantly affected by date of transplanting.…”

Investigation on Field Water Tube and Low Dose Herbicides on Growth Parameters, Microbial Population and Yield of Transplanted Rice (Oryza sativa L.)

“…The increase in DMP of rice with AWD might have brought up by loose soil, which facilitates more access to water and nutrients by roots. The correlated outcome of the results was observed by Maragatham and Martin (2010).The lesser DMP was noticed in 15 cm depletion of FWT (A 2 ) at all the three stages (1946, 6752 and 11026 kg ha -1 , respectively).The same results are in concurrence with Kabir et al, (2008).…”

Herbicides combinations for control of complex weed flora in transplanted rice

“…However, the herbicide treatments integrated with hand weeding or hand weeding alone treatment recorded similar weed control during both the years. This differential effect of rainfall on herbicides and hand weeding treatments indicated the importance of good rainfall or good soil moisture for getting best weed control from the herbicides (Phogat et al 1998, Kabir et al 2008 and increasing water depths also increased the herbicide's efficacy. The effective control of mixed weed flora with penoxsulam 25 g/ha applied at 0-5 DAT Banerjee 2007, Prakash et al 2013), of bispyribac-sodium at 20-30 g/ha as post-emergence against Echinochloa colona and Cyperus sp.…”