Previously, we developed seed-shooting seeder of rice and the machine was able to get some seeds to be hill-seeded along rows. We developed a new cell roller and investigated some factors which influenced the form of the hill-seeding spots.<br>The results were as follows:<br>1) The new cell roller was developed to discharge the CaO₂ powder of the seed coat in the cell.<br>2) The new cell roller remodeled successfully performed hill-seeding, i. e., it was able to release several seeds intermittently.<br>3) The form dimensions of the hill-seeded spot (ellipse in shape), which was obtained during paddy field and laboratory tests, were 7 to 12cm (longer diameter) and 3 to 6cm (shorter one).<br>4) Test results clearly showed that the factors influencing the form of hill-seeded spot were as follows: (a) the timing of seeds release, (b) the timing of providing or delivering seeds to the saw-toothed disc, (c) the traveling speed of the tractor, and (d) viscosity of puddled soil and other soil conditions.