De groei van jonge Hevea-oculaties = The growth of young Hevea buddings

Results were presented of studies on the initial growth of Hevea buddings, at the Proefstation West-Java, Buitenzorg (now Bogor). The time elapsing between cutting off the stock above the union and sprouting of the implanted bud was a clonal character; so also was the angle between the young sprout and the stock. The formation was described of successive shoots or leaf storeys. The characteristic periodicity shown by most buddings was not due to an inherent tendency of the plant towards interrupted elongation growth but depended on environmental conditions, the girth of the stock, and the growth vigour of the 62
clone. As these conditions became less favourable, there was a gradual transition from completely aperiodic leaf formation with a constant rate of elongation to periodic shoot formation with increasingly long resting periods between the formation of successive shoots. This periodicity of shoot formation, and the decreasing size of successive leaves within a shoot resulting in its typical umbrella- like shape, were explained as the effect of an interaction between a fairly even moisture supply to the growing point and changing water consumption by the developing leaves.