根插(root cutting):以根段作為插根的扦插方法。將粗0.3~1.5釐米的根,剪成5~15釐米長作插根,上口平剪,下口斜剪,直插於土中,扦插後發生不定根和芽。根的抗幹、抗凍能力弱,插後床面澆水並覆蓋保濕;寒地鼕季根段宜沙藏,待次春解凍後扦插。枝插成活睏難而根插較易成活的樹種如棗、柿、核桃、長山核桃、山核桃、漆樹等常用此法。苗圃中杜梨、山定子、海棠、蘋果營養係矮化砧等,可利用苗木出圃殘留下根段進行根插。
扦插的一種,把植物的根切成幾段埋在土裏,使生根,成為獨立的植物體。某些不易生根的植物如蒲公英可以用這種方法繁殖。cuttage;cutting the root of a plant into several parts and burying them in the soil so they become independent plants.this method is used for some plants that don't root easily,such as the dandelion.