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Differences in the dormancy of wild oat avena fatua kernels in different years


, : Differences in the dormancy of wild oat avena fatua kernels in different years. Sbornik UVTI (Ustav Vedeckotechnickych Informaci) Ochrana Rostlin 16(2): 147-152

The length of dormancy of wild oak kernels in Czechoslovakia varies each year depending on climatic conditions in June and July. Over 5 yr, the shortest dormancy of wild oak kernels was recorded in 1977; in June and July of that year the sum of rainfall was 197.7 mm and the average temperature was 18.1.degree. C, which was nearly 2.degree. C less than in the same period in 1976 when the longest kernel dormancy was recorded. At shorter dormancy some seeds can emerge in the summer, as observed in the colder and humid period of 1975 and 1977. For a higher wild oat seed emergence rate in autumn, particular importance is attached to a longer duration of the period with average air temperatures above 5.degree. C, to sufficient rainfall, and to a hydrothermic coefficient higher than 1.0. In that period, emergence is possible in wild oat seeds which have overcome primary dormancy as well as in the seeds stored in the soils for a longer time.

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