2013 Volume 2 Issue 3 Pages 89-99
We investigated the methods to promote flower and seed setting in 2-3 years old grafted trees of the hinoki (Chamaecyparis obtusa) clones producing little pollen that have been selected from Chiba Prefecture. As a result, the GA paste (1.5mg) application to the stems of the trees was the most promising method, with little adverse effects on their growth due to leaf die-back. Seed germination rates were from 20 to 69%, when stink bug repellant bags were used, which were sufficient for utilizing the seeds in the forest tree breeding programs. Based on the data acquired in this study, we estimated the area of the miniature seed orchard that can produce as many as seeds for covering the demand in Chiba Prefecture. The estimated area was 0.565 ha, which would be feasible area for the construction of the miniature seed orchard.
