Vol. 17 No. 1
Effect of tillage and herbicide application on broad-leaf weeds and wheat yield under alluvial zone
Author(s): D. MUKHERJEE AND B. MANDAL
Abstract: Wheat (Triticum aestivum L.) is infested with several broad-leaved weeds which create competitive stress resulting in yield losses varying from 10-70% depending upon their density. Weeds problem becomes very challenging under the era of climate shifting and weed density varies with different cultural or tillage practices. Continuous and improper use of herbicides resulted in the shifting of weed flora in terms of herbicide-resistant weed biotypes. An experiment was conducted to study the effect of herbicide on weeds in wheat grown under different tillage systems. The field experiment was conducted at the District Seed Farm (AB Block), Kalyani under the aegis of Bidhan Chandra Krishi Viswavidyalaya during the winter season of 2017-18 and 2018-19 in an upland situation. The geographical details of the site are 23° N latitude, 89° E longitude and 9.75 meter above mean sea level (MSL). The experiment was carried out in a randomized block design, replicated thrice with ten treatment mainly comprising with zero tillage + weedy, zero tillage + metsulfuron-methyl 4 g ha-1, zero tillage + metsulfuron-methyl @ 4 g ha-1fb 2,4-D @ 0.75 kg ha-1, zero tillage + metsulfuron-methyl @ 4 g ha-1 fb carfentrazone @ 20 gha-1,conventional tillage + weedy, conventional tillage + metsulfuron-methyl @ 4 gha-1, conventional tillage + metsulfuron-methyl @ 4 gha-1 fb 2,4-D @ 0.75 kgha-1, conventional tillage + metsulfuron-methyl @ 4 gha-1 fb carfentrazone @ 20 gha-1, zero tillage + weed free conventional tillage + weed free were replicated four times in randomized block design. Highest grain yield was obtained with the conventional tillage + weed free (4.30 t ha-1) and showed parity only with conventional tillage + metsulfuron-methyl @ 4 g ha-1 fb carfentrazone @ 20 g ha-1 (3.91 t ha-1) and was significantly better to other options. This was followed by zero tillage + weed free (3.81 t/ha) and conventional tillage + metsulfuron-methyl@ 4 gha-1fb 2,4-D @ 0.75 kg ha-1 (3.62 t ha-1). Conventional tillage + weed free and conventional tillage + metsulfuron-methyl @ 4 g ha-1fb carfentrazone @ 20 g ha-1 registered, 137 and 116 % more grain yield over zero tillage + weedy treatments, which recorded the lowest economic yield. From this study, we conclude that, conventional tillage + metsulfuron-methyl @ 4 gha-1fb carfentrazone @ 20 gha-1 was supposed to be the most promising option in wheat over other cultural operations.
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