Abstract
Rice seedlings soaked in naphthalene acetic acid solution before transplanting retarded the growth of roots for 1 or 2kays, but hastened it after afew days. The seedlings sprayed with the same solution on the seed bed at 2 or 3 days before transplanting produced a greater number of roots without delay after transplanting and became full of vitality sooner than the seedlings not treated. these effects were diminished gradually under the favorable condition, but caused a quicker production of tillers, a faster heading, and a better fruiting under such an unfavorable condition as would retard the growth of plants.
