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United States Department of Agriculture

Agricultural Research Service


Location: Dairy Forage Research

Project Number: 5090-21000-056-05-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Sep 26, 2011
End Date: Sep 25, 2016

1. Evaluate early- and mid-season growth regulator treatments for promoting the establishment of interseeded glyphosate-tolerant alfalfa without limiting yields of glyphosate tolerant corn.

Objective 1: With assistance from the ARS SY, the University of Wisconsin will handle planting of glyphosate-tolerant corn at two locations in May along with fertilizer applications, pest control, and harvesting of whole-plant corn for yield in September at roughly 35% dry matter. The ARS SY will interseed glyphosate-tolerant alfalfa into corn during May and, with assistance from the University of Wisconsin, will handle pest control and measurement of alfalfa forage yields under a 3-cut harvest management during the following year. In initial studies, the University of Wisconsin will spray prohexadione-Ca in June and, with the ARS SY, assess affects on alfalfa growth during corn production and 4–6 weeks following corn harvest. Subsequent studies will examine the use of prohexadione-Ca with other foliar or seed applied growth regulators to identify promising approaches for modulating competition between the co-seeded crops and for enhancing the establishment and subsequent production of interseeded alfalfa. The ARS SY and the University of Wisconsin will jointly plan experiments, analyze data, and publish results.

Last Modified: 10/16/2017
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