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Home NEWS Science News Biology

Are cover crops negatively impacting row crops?

Bioengineer by Bioengineer
July 30, 2020
in Biology
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Credit: Katja Koehler-Cole

Winter cover crops benefit soil health and can suppress weeds in subsequent row crops but may also lead to lower yields. Some farmers and agronomists speculate that allelopathic chemicals released by cover crops may be the cause for some of the observed yield reductions, but cause-and-effect relationships are rarely established. We know that allelopathic cover crops inhibit weed seed germination and early growth, but do they also impact row crops?

In an article recently published in Agricultural & Environmental Letters, a publication of the American Society of Agronomy, Crop Science Society of America and Soil Science Society of America, researchers reviewed literature documenting effects of allelopathic winter cover crops on four row crops. Studies that used known allelochemicals in the lab or measured allelochemicals in the field were included.

Only seven studies met the criteria for inclusion and six of them were lab studies. Corn and wheat germination and root length were sometimes impacted by allelopathic chemicals from cereal rye and other cover crops, but soybean was unaffected. One field study reported reduced cotton performance due to allelopathic cover crops.

We could not establish clear cause-and-effect relationships for row crops grown in the field due to the limited number of studies. However, with the increase in cover crop acreage and constantly evolving management practices, research to identify risk factors for allelopathic impacts and how to avoid them is needed.

###

Adapted from Koehler-Cole, K, Everhart, SE, Gu, Y, et al. Is allelopathy from winter cover crops affecting row crops? Agric Environ Lett. 2020; 5:e20015.

Media Contact
Rachel Schutte
[email protected]

Related Journal Article

http://dx.doi.org/10.1002/ael2.20015

Tags: Agricultural Production/EconomicsAgricultureBiologyChemical/Biological WeaponsChemistry/Physics/Materials SciencesEarth ScienceEcology/EnvironmentGeology/SoilPlant Sciences
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