车前种子种苗分级标准的研究

通过田间试验,利用聚类分析法建立车前种子种苗的三级分级标准,结果表明车前一级种子的标准为:发芽率不低于87%、千粒重不低于0.68g、净度不低于98%,含水量不高于8.4%;二级种子质量标准为:发芽率不低于74.0%、千粒重不低于0.64g、净度不低于96%,含水量不高于8.7%;三级种子质量标准为:发芽率不低于62.0%、千粒重不低于0.60g、净度不低于94%,含水量不高于9.2%。车前一级种苗的标准为:株高不低于16.70cm、根茎粗不小于10mm、根长不低于13.0cm,叶片数不少于4.5片,单株鲜重不低于15.0g;二级种苗的标准为:株高不低于14.10cm、根茎粗不小于7.0mm、根长不低于9.0cm、叶片数不少于3.5片,单株鲜重不低于11.0g;三级种苗的标准为:株高不低于10.50cm、根茎粗不小于5.0mm、根长不低于6.0cm、叶片数不少于3.0片,单株鲜重不低于8.0g。

Studies on the Classification Criteria of Plantago asiatical L Seeds and Seedlings

There were founded by field experiments and by the use of K-means cluster analysis,and the results showed that the criteria of the 1st-grade seeds were:germination percentage,at least 87%;1 000-seed weight,at least 0.68 g;purity degree,at least 98%;and water content,at most 8.4%;the criteria of the 2nd-grade seeds were:germination percentage,at least 74%;1 000-seed weight,at least 0.64 g;purity degree,at least 96%;and water content,at most 8.7%;the criteria of the 3rd-grade seeds were:germination percentage,at least 64%;1 000-seed weight,at least 0.60 g;purity degree,at least 94%;and water content,at most 9.2%.The results also showed that the criteria of the 1st-grade seedlings were:height of plant,above 16.70 cm;root stock width,above 10 mm;root length,above 13.0 cm;average leaf number,above 4.5 leaves;fresh weight of one plant,above 15.0 g;the criteria of the 2nd-grade seedlings were:height of plant,above 14.10 cm;root stock width,above 7 mm;root length,above 9.0 cm;average leaf number,above 3.5 leaves;fresh weight of one plant,above 11.0 g;the criteria of the 3rd-grade seedlings were:height of plant,above 10.50 cm;root stock width,above 5 mm;root length,above 6.0 cm;average leaf number,above 3 leaves;fresh weight of one plant,above 8.0g.