Effect of tipping on shoot and leaf growth of Ginkgo biloba

In order to study the effect of tipping on shoot and leaf growth of Ginkgo biloba, leaf area was periodically measured by using Li-3000A leaf's area instrument; the thickness and length of shoot and lateral shoot and the number of second lateral shoot were also examined. The results showed that tipping the tender new shoot in summer could effectively restrain its length growth, promoting thickness growth and the second lateral shoot bourgeon and increase the virtual leaves. The thickness of first shoot was 1.52 times that of control and the average number of leaves of bud in tipping shoot was 3.50 times that of control. Tipping could also promote the increasing of leaf area and the time of leaf mature. In addition, the leaf area was positively and linearly correlated with the length and thickness of the petiole, and this relationship was statistically significant. The research will provide guidance for training and pruning of Ginkgo biloba in summer.