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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

View larger version (47K): [in a new window]   Fig. 1. Effects of seven spring-applied fertilizer and herbicide treatments on seed yield, oil concentration, and oil yield of meadowfoam grown as a rotation crop for perennial ryegrass seed on a poorly drained soil in western Oregon in 1998 and 2001. The H+F+ control treatment is the combined application of herbicide and fertilizer at typical spring timing after weed seedlings have begun to emerge. The mean seed yield, seed oil content, and oil yield for each control in both years is shown in each graph. Bars within each graph shown with the same letter are not different at P 0.05 according to Duncan's new multiple range test.

View larger version (28K): [in a new window]   Fig. 2. The effect of the resulting seed yields on oil concentration in 1998 and 2001 from all fertilizer and herbicide treatment (Exp. 1), and direct seeding and conventional tillage establishment treatments (Exp. 2). Vertical broken lines show the range of seed yields resulting from delayed herbicide application treatments used in Exp. 1.

View larger version (31K): [in a new window]   Fig. 3. Estimated annual soil erosion amount from autumn-planted meadowfoam as affected by conventional tillage and direct-seeding establishment methods and maximal and minimal amounts of postharvest straw returned to fields following perennial grass production. The annual amount of soil erosion was estimated by the Revised Universal Soil Loss Equation (RUSLE).