understocking meaning in English

不足立木度
疏生
载畜量低
载畜密度低

After the graft union has sealed, the upper portion of the understock is removed .
待接口愈合之后，除去砧木的上部。
The understocks should be grown in place or should be potted approximately a year prior to grafting .
砧木在嫁接前一年左右就应当定植在适当的地方或者盆栽起来。
Cells of scoin and understock live in harmony with each other, but do not interlace in such a manner as to form a mechanically strong point .
接穗和砧木细胞也能相互协调地生活，但是不能相互交错以形成机械上牢固的结合。