Growth Behaviour of Ladino Clover in Summer.

[摘要] Ladino clover, seeded June 1st, 1960, was studied at five day intervals between July 1st and August 9th, to determine the growth pattern in summer, and the following results were obtained. 1) Most of the petioles, and internodes lengthened fully in 10-15 days (Tab. 1 and 2) and 5-10 days (Tab. 4) respectively; while most of the leaflets attained full size in 5-10 days (Tab. 3). Therefore, leaflets and internodes reached maximum size and length respectively almost at the same period; whereas for petioles more days were required to get lengthened fully. Most of the leaves perished after 30-35 days. 2) Correlation coefficient between leaflet length and petiole length was +0.794.** 3) The interval between leaflet emergence was shorter in the case of branches than that of the main stem. Thus, on the average, at five day intervals only one leaflet emerged on the main stem compared with 1.5 leaflets on the branches. 4) There is a relationship between the leaf's position (X), at which the respective branch branches off, and the number of leaves (Y), at the time of branching, on the main stem as shown below. (a) Y=1.047X+2.815: In the case of primary branching. (b) Y=0.914X+3.731: In the case of secondary branching. Therefore, when a branch emerges from a leaf's position (n) on the main stem, the latter possessed n+3∼n+4 leaves. After the 7th leaf, each leaf emergence was followed by a branch development (Fig. 1). 5) The time of floral bud emergence was almost coincided with the emergence of branch from the leaf just below.

[学科分类] 农业科学（综合）