| 摘要 |
The growth characteristics of plant material such as seeds and growing plants are improved by means of subjecting the material to vibrations of predetermined frequencies. Chilling is required for seeds exposed to audible frequencies although the chilling is optional when the seeds are exposed to higher frequencies. Also, the seeds must be imbibed to a certain extent when subjected to audible frequencies, the extent of imbibition being controlled through the agency of physical or physiological limitations. In the audible range, the seeds are exposed for a minimal optimal period of four weeks. Seeds exposed to ultrasound frequencies may be, however, air dry and are exposed in such range for at least several seconds.
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