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Red Clover Seed Production

V. Root Health and Crop Productivity

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

View larger version (35K): [in a new window]   Fig. 1 Comparison of the effects of herbage removal time and average annual precipitation amount on average annual red clover seed yield from 31 sites in 1992 with yields at 12 sites previously reported in 1990 and 1991. The insert figure shows the effect of average annual precipitation on the percentage of sites that have higher seed yields with early than late herbage removal time

View larger version (32K): [in a new window]   Fig. 2 Stability analysis for early (early May) and late (late June) herbage removal treatments used with red clover seed yield grown in 1992 at 31 sites. Site average seed yield is equal to the average of the early and late herbage removal phytomass yields at each location

View larger version (29K): [in a new window]   Fig. 3 The effect of herbage removal time and (A) amount of total water received, and (B) percentage of soil-water depleted on red clover seed yield in 1992 at 31 sites

View larger version (29K): [in a new window]   Fig. 4 The relationships of (A) root rot severity, and (B) root borer infestation and red clover seed production with early herbage removal and seed harvest times when grown in 1992 at 31 sites. Data are fitted with nonlinear regression functions. Dashed lines indicate the 1-for-1 line relationship for both variables

View larger version (41K): [in a new window]   Fig. 5 Maximum parsimony analysis using a general heuristic search model of 12 random amplified polymorphic bands to determine the relationships among 30 commercial red clover seed fields and six known cultivar seed sources. Cultivars identified with an "*" indicate the known cultivar sources. The name "Common" indicates seed sources that are of unknown cultivar origin. Cultivar names followed with "(c)" indicate seed fields that are grown under the rules of the Oregon Seed Certification program. The numbers along branches indicate branch lengths