This standard specifies the quality grade indicators, inspection, packaging, labeling, storage and transportation requirements for dwarfed self-rooted apple seedlings, and is applicable to the breeding and sales of first- and second-year dwarf self-rooted apple seedlings. The main content of the standard is to classify apple dwarf self-rooted seedlings into three levels from seven aspects including roots, stems, and branches within the plastic band. Among them, the first-level main indicators are: the number of lateral roots is more than 10, the thickness of the lateral root base is more than 0.25cm, the lateral root length is more than 15cm, the stem height is more than 160cm, the stem thickness is more than 1.5cm, the number of branches is more than 12, the branch length is ≥5cm . Secondary main indicators: the number of lateral roots is more than 8, the thickness of the lateral root base is more than 0.2cm, the lateral root length is more than 15cm, the stem height is more than 140cm, the stem thickness is more than 1.2cm, the number of branches is more than 9, and the branch length is ≥5cm. The main indicators of the third level are: the number of lateral roots is more than 5, the thickness of the lateral root base is more than 0.2cm, the lateral root length is more than 15cm, the stem height is more than 120cm, the stem thickness is more than 1cm, the number of branches is more than 6, and the branch length is ≥5cm.
T/QYPG 1-2021 history
2020T/QYPG 1-2021 Quality grade requirements of Qianyang apple dwarfing self-rooted rootstocks