Date of Award

2021

Publisher

North Dakota State University

Document Type

Thesis

Degree Awarded

Master of Science (MS)

Department

Plant Sciences

College

Agriculture, Food Systems and Natural Resources

Faculty Advisor

Howatt, Kirk

Description

Lack of labeled herbicides for industrial hemp (Cannabis sativa L.) production in the U.S. accentuates urgency to identify herbicides for weed control. Weed competition reduced seed yield by 25 to 32%. Pre- and post-emergence herbicide experiments were conducted to evaluate hemp tolerance to herbicides and support efforts for herbicide registrations. For post-emergence herbicides, hemp response to clopyralid (105 g ae ha-1) and bromoxynil (280 g ae ha-1) exhibited the lowest phytotoxicity, up to 38%, with no reduction of yield compared with the hand-weeded check. Pre-emergence herbicides were more viable options because pendimethalin (1120 g ai ha-1), trifluralin (840 g ai ha-1), saflufenacil (38 g ai ha-1), and pyroxasulfone (109 g ai ha-1) resulted in less than 17% visible hemp injury and increased seed yield by 18 to 33% compared with the non-treated, weedy check.

Rights

NDSU policy 190.6.2

Rights Link

https://www.ndsu.edu/fileadmin/policy/190.pdf

Author ORCID Identifier

0000-0002-2386-3250

Handle Identifier

https://hdl.handle.net/10365/32746

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