Document Type : Research Article
Authors
1
PhD student, Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran
2
Faculty of Agriculture shahrood University of Technology
3
Professor, Department of Agronomy and Plant Breeding, Faculty of plant production, Gorgan University of Agricultural Sciences and Natural Resource, Gorgan, Iran
4
Associate Professor, Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran.
10.22034/ijws.2025.369639.1488
Abstract
Currently, with the development of conservation tillage methods in soybean cultivation, evaluating the effects of these methods on weed control and herbicide efficacy has become increasingly important. Therefore, an experiment was conducted during the 2020–2021 in a strip-plot arrangement based on a randomized complete block design at two locations in Golestan Province, Iran. In the Vertical factor, different tillage methods including no-tillage (NT), minimum tillage (MT), and conventional tillage (CT) were applied, and in the Horizontal factor, different weed management treatments including hand weeding, no weeding, and various combinations of pre-emergence application of metribuzin and post-emergence herbicides imazethapyr, bentazon, and clethodim were used. The results showed that the highest percentage reduction in weed dry weight compared to the no-weed-control check was observed in treatments with the combined application of metribuzin and post-emergence herbicides. Also the traits of number of pods per plant, number of seeds per pod, grain yield, biological yield, and harvest index in the no-tillage system combined with pre- and post-emergence herbicide application increased by 12.21%, 14.35%, 24.95%, 19.11%, and 5.95%, respectively, compared to conventional tillage with the same herbicide applications. Soybean grain yield in the no-tillage treatment with combined application of the pre-emergence herbicide metribuzin and the post-emergence herbicides bentazon and clethodim showed a 141.2% increase compared to the conventional tillage treatment with no weed control. In general, the results showed that the no-tillage treatment combined with the use of pre- and post-emergence herbicides increased grain yield by improving soybean growth conditions and effective weed control.
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