US Patent 6,453,609
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
The invention consists of a sonication and imbibition process for the uptake of water and/or other beneficial substances into a seed. The seed to be treated is immersed in water or other liquids. The seed is exposed to sound energy at frequencies between 15 kHz and 30 kHz for periods between about 1 and 15 minutes. The ultrasonic energy generates cavitational forces by the adiabatic collapse of microbubbles in the liquid medium, particularly those bubbles that collapse at the surface of the seed. The ultrasonic cavitational forces impart an enhanced stable memory for the seeds to imbibe water and/or other substances beneficial to the seed and/or plant. The ultrasonically treated seed can be dried, stored, and later imbibed with a substance that enhances a growth characteristic of the seed or resultant plant. Upon germination, the plant maintains the enhanced growth characteristics. The effect is substantially enhanced by saturating the water with a noble gas such as helium or argon, or combinations of inert gases.
Soll, David R.; Daniels, Karla J.; and Gibson, Donovan P. Method for uptake of a substance into a seed. US Patent 6,453,609 filed September 06, 2000 and issued September 24, 2002. https://ir.uiowa.edu/patents/313