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Persistence of Crop Seeds in Soil¹

Thirteen species and varieties of crop seeds were buried in the field at 2.6-, 5.1-, 7.6-, 12.7-, and 17.8-cm (1-, 2-, 3-, 5-, and 7-inch) depths in Saran mesh bags to study seed persistence and depletion. Persistence and viability tended to increase with increasing burial depth, especially in ‘Dixie’ crimson and ‘Pennscott’ red clovers. Seeds of ‘Illahee’ red fescue were depleted first; none were found in the 2nd year. No viable seeds of Danish commercial orchardgrass, ‘Alta’ tall fescue, or chewings fescue were found in the 3rd year. ‘Linn’ perennial ryegrass retained a trace of vialibity into the 4th year. Oregon annual ryegrass seeds showed viability in the 7th year. Seeds of ‘Highland’ colonial bentgrass, Dixie crimson clover, and Pennscott red clover had considerable viability in the 7th year. Some changes in field history requirements for certified seed production in certain species seem to be warranted.

Key Words: Buried seeds • Seed dormancy • Seed viability • Field history

² Research Agronomist, Crops Research Division ARS, USDA, cooperating with the Oregon Agricultural Experiment Station, and Associate Agronomist, Oregon Agricultural Experiment Station.

Received for publication September 29, 1969.

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