Preliminary discussion on the standards for classification of 1-year nursery stuck of Tectona grandis L. is conducted with the method of gradual cluster analysis and relevant quality index collection.
通过相关分析进行质量指标提取，采用逐步聚类分析方法，对柚木1年生苗木分级标准进行了初步探讨。
Classification standards of indicators for soil quality evaluation were put forward and the situations of soil property of Hebei Plain were discussed.
提出了河北平原土壤质量评价指标的分级标准，依据该标准对河北平原典型土壤样品进行了单因素评价。
Classification standards of indicators for soil quality evaluation were put forward and the situations of soil property of Hebei Plain were discussed.
提出了河北平原土壤质量评价指标的分级标准，依据该标准对河北平原典型土壤样品进行了单因素评价。
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