Document Type : Research Paper
Authors
1
lorestan University
2
MSc. student of Weed Science, Department of Plant Protection, Faculty of Agriculture, Lorestan University, Khorramabad
3
Assistant Professor, Plant Protection Research Department, Lorestan Agricultural and Natural Resources Research, and Education Center, AREEO, Khorramabad, Iran
Abstract
This research aimed to assess the impact of conservation tillage systems on crop yield, and weed management in a rain-fed chickpea field. The experiment was carried out as strip plot based on complete randomized block design with four replications in Lorestan province during 2014-2015. The main factor included four levels (NT- without glyphosate herbicide, NT- with glyphosate herbicide, RT, and CT), while the sub-factor comprised five levels: pre-emergent herbicides pyroxasulfuron, fluroxsulam, metribuzin, hand weeding treatment, and unweeded control. Results showed that applying glyphosate in NT conditions led to the most significant reduction in weed density and biomass by 53.6% and 72.4%, respectively, during mid-season growth. The highest average yield of chickpeas was recorded in the RT treatment, CT and without initial tillage with the use of glyphosate herbicide treatments as 206.8, 192.4 and 180.3 kg. ha-1, respectively. The treatment with two stages of hand weeding in RT conditions resulted in the highest increase in grain yield by 382.7 kg. ha-1, followed by the use of pyroxasulfone herbicide with an increase of 189.3 kg. ha-1 with an increase of 212 and 54.8 percent compared to the control, respectively. Pyroxasulfuron, fluroxsulam and metribuzin were the most potent herbicides for weed control, demonstrating 49%, 41.7%, and 8.6% effectiveness, respectively, compared to the control. These results indicate that RT could serve as a viable alternative to CT in rainfed chickpea fields.
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