우리나라 矮性사과나무의 樹形에 關한 硏究Ⅱ : 慶尙北道의 北部 및 南部 사과地帶의 樹形을 中心으로 Refer to the tree form in major apple growing regions of north and south part of Kyongsang buk-do = Studies on the Tree Form of Dwarfed Apple Tree in KOREA Ⅱ

다국어 초록 (Multilingual Abstract)

This study was carried out to develop the methods to get more suitable tree shape of dwarfed apple trees than those which are being used by apple growers in Kyongsang buk-do these days.
The present methods of training and pruning related to the tree shape and several other items of dwarfed apple trees were surveyed and investigated in major apple growing regions of Kyongsang buk-do.
The results obtained are summarized as follows.
1. The rootstocks for dwaried apple trees in apple regions of Kyongsang buk-do were mostly M26 and MM106 in a little amount.
Most of dwarfed apple trees in this region were younger than 5∼8 years implying that the dwarf apple trees were planted more lately than the other provinces.
2. The planting distance of the trees grafted on M26 rootstock was 4×3m or 5×5m between row and space in row.
3. The standard sootstock occupied about 78% of the apple growing area in both North and South part of Kyongsang buk-do as yet.
The newly planted apple trees were entirely the dwarfed ones.
4. Most of dwarfed apple trees grown in this area were trained to have 10∼15 small main branches without secondary branch on vertical main stem.
So that the shading by the overlapped crown should be avoided.
5. The present study suggested as follows;
1) The dwarfed apple trees of the M26 rootstock should be planted 4×2∼2.5m between row and space in row on infertile soil and trained by slender spindle bush type.
2) Those dwarfed apple trees will be planted 4×3∼3.5m between row and space in row on fertile soil and trained by dwarfed central leader type.
3) Apple trees of the MM106 rootstock should be planted 5×4m distance between row and space in row on infertile and 6×4m on fertile soil and trained by dwarfed modified leader type.
4) Standard apple trees will be planted 8×8m or 9×8m space according to soil fertility and trained modified leader type.