桑苗质量标准的研究

Studies on Quality Standard of Mulberry Seedling

通过近３年的桑苗大田调查和种植验证试验，研究确定了桑苗质量标准的核心内容：主要指标、等级和分级标准。以根基直径作为衡量桑苗质量的主要指标，按根基直径将嫁接苗分成三个等级：小苗（５０～６９ｍｍ），中苗（７０～９９ｍｍ），大苗（大于等于１００ｍｍ）；将实生苗分成二个等级：小苗（２５～３９ｍｍ），大苗（大于等于４０ｍｍ）。

Through nearly three years of field investigation and planting experiments,the key content of quality standard of mulberry seedling has been established as follows:Main index,grade and grading standard.The diameter at the butt end of root is taken as the main index.Based on this,grafted seedlings are classified into three grades,i.e. small seedling 5.0～6.9 mm,medium one 7.0～9.9 mm and large one ≥ 10.0 mm.While seedlings are graded into two grades,i.e. small seedling 2.5～3.9 mm and large one ≥ 4.0 mm.