Abstract
We were able to grow the nursery stock of Japanese pear ‘Gyokusui’ grafted on Pyrus calleryana for a tree joint V-shaped trellis system in one year, which normally takes two years to grow. First, we investigated the optimal sowing time and planting interval for P. calleryana No.6 and No.8. We showed that it was possible to produce rootstocks that could be grafted for 1 year by following the steps P. calleryana No.6 and No.8were sowed in January or February and in June seedlings of P. calleryana No.6 and No.8 were planted at 10 or 20cm intervals in nursery garden. Second, we investigated that shorten training period of‘Gyokusui’ grafted on P. calleryana for a tree joint V-shaped trellis system from 2 years to 1 year by growing in M StAR containers. The nursery stock for a tree joint V-shaped trellis system were made by transplanting one-year-old rootstocks to 4L or 6L M StAR containers in February and grafting them with ‘Gyokusui’ in March.
