A laboratory assessment of seed softening patterns for hard seeds of Trifolium subterraneum subspp. subterraneum and brachycalycinum, and of annual Medicago spp.
1986
Bolland, M.D.A. (Western Australian Dept. of Agriculture, Perth. Div. of Plant Research)
Lack of adequate levels of hard-seededness may be a factor in the failure of subsp. subterraneum to persist under intense cropping in some rainfall and soil conditions. Subsp. brachycalycinum is unlikely to be more successful for the same reason.
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