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Production Papers

Conservation Practices in Western Oregon Perennial Grass Seed Systems

II. Meadowfoam Rotation Crop Management

USDA-ARS, National Forage Seed Production Research Center, 3450 SW Campus Way, Corvallis, OR 97331

^* Corresponding author (jeffrey.steiner{at}ars.usda.gov)

Received for publication December 15, 2005. Rapid changes in practices used to produce perennial grass seed crops in the U.S. Pacific Northwest region and shortened lengths of time that perennial grass seed fields remain in production have increased the need for additional rotation crops that are adapted to the poorly drained soils found in western Oregon. This research was conducted at three sites to determine ways to manage meadowfoam (Limnanthes alba Hartw. ex Benth.) as a component in perennial grass seed rotation systems. Experiments were conducted in 1997, 1998, and 2001 to investigate combinations of spring-applied herbicide and N fertilizer and times of applications, direct-seeded and conventional tillage establishment methods, and previous crop residue management on meadowfoam seed yield, seed oil concentration, and oil yield. No spring-applied fertilizer or herbicide produced responses for all yield components as great as or greater than any other treatment combination. Direct-seeded meadowfoam yielded more oil than the conventional establishment treatment. There was no effect of residue management amounts from grass seed grown in the previous rotation sequence on meadowfoam production; however, maximal residue management, especially if used in combination with direct-seeded meadowfoam, should reduce annual soil erosion. Meadowfoam is suited to low-input production and is adapted to the use of conservation practices including direct seeding and maximal residue management in perennial grass seed systems.

Abbreviations: H+F+, herbicide plus fertilizer applied at the normal time • H+F–, herbicide applied at the normal time but without fertilizer • H+Fd, herbicide applied at the normal time with fertilizer application delayed • H–F+, fertilizer applied at the normal time without herbicide • H–F–, no herbicide or fertilizer applied • HdF+, fertilizer applied at the normal time but the herbicide application delayed • HdF–, herbicide application delayed and no fertilizer applied