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- W2092720837 abstract "Summary Thermal requirements for the germination of Amaranthus quitensis , a common annual weed in Argentina, were studied. In addition, temporal changes in dormancy from seeds produced at different times during the growing season were examined. For this second objective, thermal and light requirements for germination were tested in seeds buried at different depths, with or without crop residues. Base and optimum temperatures for germination rates were 12.8°C and 37°C respectively. At dispersal time, maximum percentage germination was 60–70% and this was generally recorded at 35°C/25°C in a 14‐h photoperiod. Seed germination tended to increase in later seed collection dates. Seeds of A. quitensis showed seasonal changes in germinability in the soil. In winter, germination of retrieved seeds increased to over 90% until summer, after which there was a decrease until the following winter when germination was close to 40%. There were no differences in germinability between burial depths and crop residue levels. Germination requirements for alternating temperatures and light tended to disappear after burial. Initial viability was 99% and declined slightly during burial. Soil temperature seems to play a crucial role not only by regulating seasonal changes in dormancy, but also by defining the percentage and the germination rate in non‐dormant seeds." @default.
- W2092720837 created "2016-06-24" @default.
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- W2092720837 date "2005-09-06" @default.
- W2092720837 modified "2023-10-15" @default.
- W2092720837 title "Germination characteristics of Amaranthus quitensis as affected by seed production date and duration of burial" @default.
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- W2092720837 doi "https://doi.org/10.1111/j.1365-3180.2005.00469.x" @default.
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