直根是一个汉语词语，拼音是zhí gēn，意思是比较发达的粗而长的主根，与须根对照。
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However, Castanea mollissima cultivation is prior to field seedling propagation now, owing to its taproot characteristic and feeble regeneration capability of root system, lead to injure root seriously when seedlings transplant forestation, revive seedling slowly and fruit late.
然而，目前板栗主要以大田实生繁殖为主，由于其苗木的直根性，且根系再生能力差，致使苗木移栽造林时伤根严重，缓苗极慢，结实较晚。
参考来源 - 板栗菌根化容器育苗技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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