A method of enhancing a growth characteristic of seed by immersing the seed in an aqueous solution including dissolved inert gas and sonicating the seed at a frequency preferably of between about 15 kHz and about 30 kHz and an energy density of between about 1 watt/cm.sup.2 and about 10 watts/cm.sup.2...http://www.google.fr/patents/US6195936?utm_source=gb-gplus-shareBrevet US6195936 - Method for uptake of a substance into a seed
