Seed production, Variety trials, Esperance region (WA), Western Australia, Trifolium subterraneum
Ungrazed swards of some subsp. brachycalycinum strains produced reasonable seed yields compared with subsp. subterraneum on the sandplain soils and annual Medicago species on the alkaline mallee soils. However, in swards which were grazed by sheep up to the start of flowering, subsp. brachycalycinum produced disappointing seed yields compared with subsp. subterraneum and annual Medicago species. On a sandy soil, prevention of burr burial compared with covering developing burrs with sand drastically reduce ation an inhibiting light factor operates to drastically reduce seed production.
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Bolland, M D. (1988), Seed production and hard seededness of Trifolium subterraneum subsp brachycalycinum. Department of Agriculture and Food, Western Australia. Technical Bulletin 78, 17p.