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The viability of ragwort (Senecio jacobaea L.) seed buried for several years at 0 ‐ 2, 4 ‐ 6 and 19 ‐ 21 cm depths was evaluated in four different soil types. Seed samples in nylon mesh bags were removed after 1, 2, 3, 5, 11 and 16 years burial and their viability determined by germination. After 16 years no viable seed was found in the clay soil. In the silt loam and peat soils 1 ‐ 3% viable seed remained while in the sandy soil up to 13% remained viable. In the surface 0 ‐ 2 cm layer of soil it took from 10.9 to 14.6 years for the percentage of viable seed to fall to 1% of the original viable seed, depending on soil type. At the 4 ‐ 6 and 19 ‐ 21 cm depths the corresponding times were 12.8 ‐ 16.5 years and 13.0 ‐ 18.0 years.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Longevity of buried ragwort seed in four soils