Abstract:
To evaluate the impact of various tillage systems in combination with herbicides on weed density and grain yield of wheat under rice-wheat cropping system, an experiment was conducted in low precipitation zone of NWFP (Dera Ismail Khan), Pakistan during 2007–2009. The experiment was laid out in randomized complete block design with split plot arrangements replicated four times. The treatments comprised of 3 tillage systems, including conventional tillage with disk ploughing (CT), reduced tillage with shallow ploughing through rotavator (RT), and zero tillage with stubble direct drilling (ZT) as main plots while five weed control treatments viz. 2,4-D ester @ 1.25 L ha-1, Puma super 75 EW @1.25 L ha-1, 2,4-D + Puma super @1.25 L ha-1 each, Affinity 50 WDG @ 2 kg ha-1 and weedy check as subplots. Herbicides had significant effect on weed density, dry weed biomass (DWB), and grain yield. Tillage x herbicides interaction occurred for weed density and grain yield only. Maximum grain yield (6906.9 kg ha-1) was recorded with Affinity. Maximum weed density m-2 (75.5) and DWB (220.4 g m-2) were recorded in weedy check, while maximum grain yield (5583.8 kg ha-1) was obtained from RT being statistically similar to grain yield (5575.1 kg ha-1) in ZT. The lower grain yield (5479.3 kg ha-1) in CT was due to maximum weed density m-2 (48.3), and DWB (136.5 g m-2). Affinity was the most effective herbicide against grasses as well as broad-leaved weeds in combination with either ZT or RT and resulted in higher grain yield.
Page(s):
155-169
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Weed Science Research, Volume: 15, Issue: 2--3, Year: 2009