Propagation of chestnut by layer. II

Rooting abilities of some of cultural varieties

Abstract

In continuation of the preceding research, layer-ing experiment has been conducted on Japanese and Chinese chestnut trees making use of growth pro-moting substances in lanolin paste.
1. Varieties which were especially hard to root with IBA alone, rooted better with a mixture of IBA and 2, 4, 5-Tp, and with 2, 4, 5-Tp alone. Also by foliar application of 2, 4, 5-Tp to seedlings in layering bed, vigorous rooting was obtained.
2. Rooting ability of cultural variety was great-er after shoots have stopped growing than during their elongating period.
3. The longer the length of shoot of cultural variety, the lower the percentages of rooting.
4. Layers which were grafted on vigorous stock required a longer duration in rooting than those grafted on less vigorous stock.
5. Concerning the rooting percentages and root-ing time, considerable differences were observed among juvenile seedlings and two types of varieties of which one was easy and the other hard to root. Higher rooting percentages were accompanied with shorter rooting time.