Persistencia de semillas de yuyo colorado en un suelo sin remoción
A study was conducted in order to evaluate the effect of depth and time of burial on redroot pigweed (Amaranthus quitensis) seed longevity in no-till soil. Seeds originated from plants of the same cohort. A group was stored under laboratory conditions; another group, divided into subgroups of 100 seeds, was placed in plastic bags and buried at 3, 10 and 15 cm. At 6, 12, 18, 24, 30, 36 and 60 months, the number of viable seeds was tested under fluctuating light and temperature conditions and with gibberellic acid. Tetrazolium tests were performed for the remaining seeds. Viability at the begining of the experiment was 98 percent, and 56 percent of seeds were in the primary dormancy condition. Most of the seeds recovered from the soil germinated with fluctuating light and temperature, while only 1 percent germinated with gibberellic acid. Low response to gibberellic acid indicated the loss of primary dormancy after six months of burial. Depth had little effect on longevity, and up to 36 months no significant differences between depths were found. Viability percentages between depths of 3 cm and 15 cm were significantly different only at 60 months. Viability decreased throughout the experiment, most markedly between 24 and 36 months. At 60 months, viability at 3, 10 and 15 cm depths was 13 percent, 22 percent and 31 percent, respectively. For seeds stored under laboratory conditions, viability was 86 percent.
| Main Authors: | , |
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| Format: | biblioteca |
| Language: | spa |
| Published: |
(Abr
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| Subjects: | AMARANTHUS, SEMILLAS, LONGEVIDAD, VIABILIDAD, GERMINACION, |
| Online Access: | http://hdl.handle.net/11554/9650 |
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