Abstract: The aims were to screen out suitable pelleting formulas for rapeseed（Brassica napus L.）seeds，and investigate the relationship between the physical properties of fillers and the quality of pelleted seeds as well as their germination. The study used bentonite（B）and eucalyptus sawdust（E）as fillers，with mass ratios of 10∶0，9∶1，8∶2，7∶3，6∶4，5∶5，4∶6，3∶7，2∶8，1∶9，and 0∶10，respectively.Eleven physical property indicators of the fillers were measured，and five quality indicators and eight germination indicators of rapeseed pelleted seeds were detected. Cluster analysis and correlation analysis were used to explore the effects of the bentonite and eucalyptus sawdust ratios on the physical properties of the fillers，the quality of the pelleted seeds，and the germination of the pelleted seeds，as well as the relationship between them. The results showed that the indicators such as the Carr index，porosity，Hausner ratio，median particle size，particle size distribution range，and water solubility of eucalyptus sawdust were all higher than those of bentonite. With the increase of the proportion of eucalyptus sawdust，the median particle size，particle size distribution range，and water solubility of the fillers significantly increased，while the bulk density and tapped density significantly decreased，with other indicators showing a multi⁃peak trend. The compressive strength of the pelleted seeds increased first and then decreased with the increase of the proportion of eucalyptus sawdust，with B4E6 treatment（i.e.，B∶E = 4∶6；hereinafter，similar notation applied）reaching the highest value of 6. 81 N.There was no significant difference in germination rate between the B8E2，B7E3，and B6E4 treatments and the bare seeds. Among them，the B6E4 treatment had a better comprehensive performance，with average germination rate of 88%，vitality index of 1.20，average root length of 5.42 cm，average shoot length of 2.53 cm，average dry weight of seedlings（five）of 0.038 7 g，and relatively better pelleted seeds quality indicators：compressive strength of 5.98 N，single seed rate of 99%，and 100% seed rate. Correlation analysis showed that germination potential and germination index were significantly positively correlated with median particle size，particle size distribution range，and water solubility，and significantly negatively correlated with bulk density and tapped density.In summary，the physical properties of the fillers（bulk density，tapped density，median particle size，particle size distribution range，and water solubility）significantly affect the quality and germination of the pelleted seeds，and B6E4 was selected as the optimal pelleting formula for rapeseed seeds.

Key words: Rapeseed, Seed pelleting, Bentonite, Eucalyptus wood powder, Seed germination

摘要： 为筛选适宜油菜种子的丸粒化配方，并探究填充剂物理属性与丸粒化种子质量及萌发的关系，以膨润土（B）与桉木粉（E）配比粉体（质量比分别为10∶0、9∶1、8∶2、7∶3、6∶4、5∶5、4∶6、3∶7、2∶8、1∶9、0∶10）为填充剂，测定填充剂11项物理属性指标，检测油菜丸粒化种子5项质量指标及8项发芽指标，通过聚类分析和相关性分析探究膨润土与桉木粉配比对填充剂物理属性、丸粒化种子质量、丸粒化种子萌发的影响及它们之间的联系。结果表明，桉木粉的卡尔指数、孔隙率、豪斯纳比、中值粒径、粒径分布范围、水溶率等指标均高于膨润土，随桉木粉占比增加，粉体中值粒径、粒径分布范围、水溶率显著递增，松装密度与振实密度显著递减，其余指标呈多峰变化趋势。丸粒化种子抗压强度随桉木粉占比增加先升后降，处理B4E6（即B∶E为4∶6，以下类同）达最高（6.81 N）。B8E2、B7E3、B6E4处理发芽率与裸种无显著差异。其中B6E4处理综合表现较好，其平均发芽率88%，活力指数1.20，平均根长5.42 cm，平均芽长2.53 cm，平均幼苗干质量（5株）0.038 7 g，丸粒化种子质量指标也较优：抗压强度5.98 N，单籽率99.00%，有籽率100.00%。相关性分析显示，发芽势、发芽指数均与中值粒径、粒径分布范围及水溶率呈极显著正相关，与松装密度、振实密度呈显著负相关。综上所述，填充剂物理属性（松装密度、振实密度、中值粒径、粒径分布范围、水溶率）显著影响丸粒化种子质量与萌发，B6E4为油菜种子最佳丸粒化配方。

关键词: 油菜, 种子丸粒化, 膨润土, 桉木粉, 种子萌发