ArticleBMC plant biology2026
A sustainable strategy for alfalfa establishment: optimized reduced-rate tank mixtures for controlling Amaranthus retroflexus and Chenopodium album.
Article in BMC plant biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundAlfalfa (Medicago sativa L.), a globally significant perennial leguminous forage crop, is widely cultivated in Inner Mongolia. Problematic weeds present a significant challenge to alfalfa production during the seedling stage, especially redroot pigweed (Amaranthus retroflexus L.) and common lambsquarters (Chenopodium album L.). However, limited information is available on pre-emergence herbicides effective against both redroot pigweed and common lambsquarters in alfalfa fields during the establishment phase in Inner Mongolia.
resultsWe examined the effects of 12 pre-emergence herbicide tank-mixture treatments on weed density and alfalfa emergence, fresh weight, and dry weight at 30 days after herbicide application. Acetochlor-imazethapyr (270 + 18.75 g a.i. ha⁻¹) resulted in higher alfalfa fresh and dry weights than the weedy treatment and reduced the density of common lambsquarters and redroot pigweed by more than 91%. Acetochlor + trifluralin (270 + 187.5 g a.i. ha⁻¹) treatment, corresponding to 75% of the recommended rate for each herbicide, provided effective weed control. It achieved over 93% weed density reduction against common lambsquarters, redroot pigweed, and grasses, while supporting alfalfa crop establishment.
conclusionThese findings highlight the potential of reduced-rate herbicide mixtures for sustainable weed management in alfalfa. In particular, the acetochlor + trifluralin combination (270 + 187.5 g a.i. ha⁻¹) offers an effective and lower-cost option for broad-spectrum weed control under local production conditions. Our results demonstrate that an optimized herbicide combination and application rate can effectively control redroot pigweed and common lambsquarters in alfalfa fields.
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