Multiplication of yamabudo (Vitis coignetiae Puliat) by cutting in a heavy snow region
1992
Ishida, M.(Toyama-ken. Forestry and Forest Products Research Center, Imizu (Japan))
In Toyama prefecture, the multiplication by planting cuttings of 22 clones' yamabudo (Vitis coignetiae Puliat, 18 clones were planted in the spring, and 4 clones were planted in the fall) was examined for a year. Leaves numbers of the cuttings reached a maximum in September. The largest cutting had 32 leaves and 230cm length. In July and August the cuttings grew rapidly, but many of the cuttings died. 44% of all cuttings have ever leaved once. Although the percentage of leafing cuttings in September was 34 %, one in the next spring was 14%. The percentages of the cuttings that passed the winter differed among the clones (maximum; 40%, minimum; 0%). These percentages were high in the clones that kept high percentages of leafing cuttings in 1991. The clone that was planted in the spring recorded the highest percentage of the cuttings survived till the next spring. The relationships between the leafing and the morphologies (diameter, length and number of nodes) of the cuttings were not recognized. But the rate of the cutting survived till the next spring was high in the cuttings which had 6-14mm diameter and longer than 100mm in length. The way how to improve the yield of the cuttings that survived till the next spring was discussed.
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