Changes in Seed Dormancy in Soil after Seed Rain of Datura stramonium

Bazyar, Sara; Vazan, Saeed; Najafi, Hossein; Oveisi, Mostafa

Changes in Seed Dormancy in Soil after Seed Rain of Datura stramonium

Document Type : Research Paper

Authors

Abstract

To investigate the level of datura seed dormancy in the soil after the seed rain, a factorial experiment based on randomized complete blocks design was conducted in three replications, during 2011–2012 in Karaj. Factors comprised three moisture regimes (moisture levels inclouded 1- dry (H₁), 2- alternate wetting and drying (H₂), 3- moisture (H₃) ) and four temperatures of seed storage (temperatures in four months of the seed rain to restart growth integrated December and January (T₁), February and March (T₂), April (T₃) and at the end of May and June (T₄)) in a factorial combination were applied on Datura seed mass. After applying each treatment, germination tests at temperatures of 8, 14, 20, 28 and 35°C were performed. Then according to the estimated parameters, the relationship between temperature and moisture with Hydro-Thermal models which was investigated. Results indicated that response of germination percentage adequately described with segmented functions, continually. When the seeds were completely at dry conditions, a gradual increased in temperature increases the rate of germination. However, this increase was negligible compared with the increase observed in response to the two other levels of moisture levels (H₂- H₃). No germination was found at temperatures 4 & 7°C, irrespective of moisture levels. While with increasing temperature up to 15 and 23°C, the rate of germination increased considerably, especially for alternate wetting and drying conditions.

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References

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