Abstract
1) Time of withering of each leaf expressed by a particular index : "Seedling-age at the time of withering of a given leaf." 2) Rate of growth of seedlings as expressed by the length of time interval between the appearance of the successive leaves was accelerated by the supply of nitrogen fertilizer. The index "Seedling-age at the time of leaf withering" was also affected ; it became larger than the seedlings supplied little or no. 3) Only under the sufficient supply of nitrogen, phosphate fertilizer exert the effect of increase of the index.
