and germinated on damp gauze. Orderly germinating seedlings
were chosen for experiments. Pieces of metal filaments were cut approximately 3 cm in
length. One end of the metal filament was tied to a germinating seed and the other was inserted
into a foamed plastic mass, which floated on the water surface. The germinating seminal roots and
part of the seed were soaked in the water. The foamed plastic mass was a little smaller than the
glass tank, so it could float freely on the water surface, and the growth status of rice could be easily
observed because it was close to the side of the glass tank