插穗中碳、氮的绝对量及碳 /氮比率可作为白榆新梢生根的指标。

C and N conternt as well as C/N ratio can be taken as a rooting index of elm tip.

youdao

插穗中碳、氮的绝对量及碳 /氮比率可作为白榆新梢生根的指标。

C and N conternt as well as C/N ratio can be taken as a rooting index of elm tip.

youdao