Hordeum vulgare L. was undersown with Lolium multiflorum Lam. or Trifolium pratense L. or grown alone to assess the effects of undersowing on yields, root biomass, disease incidence and total grain losses in the year of seeding. Glycine max (L.) was grown in one of the studies to determine the yield responses in cropping sequence. T. pratense undersown in H. vulgare reduced the grain yield by about 10% in comparison with H. vulgare grown alone. L. multiflorum reduced grain yields up to 41% depending on growing conditions and cultivar. Herbage dry matter yield of L. multiflorum was greater than the yield of T. pratense. Root biomass was the greatest for L. multiflorum cvs. 'Lemtal', 'Barmultra' and 'Aubade'. Growing L. multiflorum or T. pratense with H. vulgare increased root biomass several fold compared with growing H. vulgare alone. Leaf disease severity and grain losses were similar for H. vulgare undersown with forages or grown alone, G. max grown in alternate years had similar yields regardless of the preceding species. © 1992.
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