noun
cleft grafting; crown grafting
A horticultural technique where a scion is inserted into a split in the rootstock. Used in fruit tree cultivation.
リンゴの苗木は割り接ぎで増やすことが多い。
Apple saplings are often propagated by cleft grafting.
接ぎ木 is the general term for grafting, while 割り接ぎ specifically refers to cleft or crown grafting, a particular method.
Compound of 割り (splitting) + 接ぎ (grafting), describing the technique of grafting by splitting the stock.