抄録
The influence of the proportion of terminal spurs originating mainly from short 2-year-old woods and lateral spurs originating from lateral buds of long 2-year-old woods to total 1-year-old woods on the vegetative and reproductive growth of 'Fuji' and 'Orin' apple trees (Mains domestica Borkh), was investigated. The ratio'of terminal spurs to the total 1-year-old woods varied from 1.4 to 62.8%, whereas that of lateral spurs ranged from 22.4 to 85.2%. In 'Fuji' trees, with the open center (OG) system, the proportion of terminal spurs was 24.7% and that of lateral spurs was 56.9%; in the central leader (CL) type, it was 24.6 and 56.7%. In 'Orin', however, the proportion was 30.2 and 46.5% for terminal spurs and lateral spurs, respectively. Hense, the proportion of terminal spurs was inversely related to that of lateral spurs in both varieties and training systems. The ratio of these two kinds of spurs, characterizes the vegetative and reproductive growth of lateral branches, indicating that on branches with a higher percentage of lateral spurs, there are more shoots per 1-year-old wood . There was a negative relationship between the percentage of flower bearing 1-year-old woods and the percentage of terminal spurs in 'Fuji'-CL (R2=0.58). The percentage of terminal spurs and fruit set of lateral spurs accounted significantly for the variation in number of fruit per leaf area. These results suggest that the ratio of lateral to terminal spurs can be utilized as an indicator to control the vegetative and reproductive growth.
