Abstract
Differentiation of ear may vary more or less with the environmental condition. On choko-No. 202, following facts were ascertained. 1) The shoot of the corn plant passes through two stages in its differentiation sequence. During the first stage, axillary shoots became larger in succession from the apex to the base of the stem. During the second stage, the order in size changes, so that the topmost shoot is the largest and shoots become smaller at the base than the top of the plant. On 42 days after planting fits change was found. 2) In the early stage of stem development, a shoot is produced in the axil of each leaf but at a later stage of development, axillary shoots are no longer produced. The cessation of axillary shoot development seems to be associated with tho elongation of the internodes of the stem and the development of the tassel. In early stage of shoot development, the axillary shoots differentiate at the lower node but in later the topmost shoot is the largest and these shoots formed at the base of the stem may remain nonfunctional or develop in to sackers. 3) On 44 dags after planting, spikelet initial differentiate. When the growing point of the axillary shoot elongates and the spikelet on the central axis was differentiates, we recognized ear dlifferentiation. 4) It is considered important in corn culture to acertain the period of ear dfferentiatiation and the sige of each axillary shoot.
