为明确采用营养土育秧时的最佳培肥配方，以南粳9108为材料，选用不同肥料配比进行营养土培肥，共设计14个处理，分别为处理1，不添加肥料；处理2基质配比为育秧绿∶床底肥∶土=1∶0.5∶200；处理3为育秧绿∶调酸剂∶土=1∶0.15∶150；处理4～6为育秧绿∶调酸剂∶土=1∶0.3∶150；处理7为育秧绿∶调酸剂∶土=1∶0.45∶150；处理8为育秧绿∶调酸剂∶床底肥∶土=1∶0.3∶0.5∶150；处理9～13为育秧绿∶调酸剂∶床底肥∶土=1∶0.3∶0.5∶200；处理14为育秧绿∶调酸剂∶床底肥∶土=1∶0.3∶0.5∶250；其中，处理4、5施用床底肥27 g/盘，处理12在搬盘后第9和16天分别施用二铵1.5 g/盘+尿素1 g/盘，处理13同期施用硫酸铵3.5 g/盘，其余处理同期施用尿素2 g/盘；处理9采用60 g咪鲜甲霜灵处理9 kg种子，处理11采用60 g咪鲜甲霜灵+0.3 g 15%多效唑处理9 kg种子，其余处理采用60 g咪鲜甲霜灵+0.15 g 15%多效唑处理9 kg种子。探究不同基质配比及施肥管理对秧苗素质的影响。结果表明，处理1、处理5、处理3、处理7、处理4、处理11、处理13、处理6和处理14的出苗率较高，在57.50%～68.67%；各处理株高在12.44～20.52 cm，叶龄在4.86～5.53叶，白根数在11.80～14.37条/株，茎基宽在2.00～2.70 mm，SPAD值在22.07～30.37。综合分析各处理对出苗率、白根数和叶色等方面的影响，以处理11（育秧绿∶调酸剂∶床底肥∶土=1∶0.3∶0.5∶200；60 g咪鲜甲霜灵+0.3 g 15%多效唑处理9 kg种子；搬盘后第9 和16天分别施尿素2 g/盘）的出苗率、白根数、叶龄和茎基宽均处于中上水平，有利于培育壮秧，可在生产中推广应用。

To identify the optimal fertilization formula for nutrient soil in rice seedling cultivation, the variety Nanjing 9108 was used as experimental material. Different fertilizer formulations were applied to prepare the nutrient soil. A total of 14 treatments were designed, including treatment 1 without adding fertilizer; treatment 2, the substrate ratio was seedling green∶bed bottom fertilizer∶soil=1∶0.5∶200; treatment 3, seedling green∶acid regulator∶soil=1∶0.15∶150; treatment 4-6, seedling green∶acid regulator∶soil=1∶0.3∶150; treatment 7, seedling green∶acid regulator∶soil=1∶0.45∶150; treatment 8, seedling green∶acid regulator∶bed bottom fertilizer∶soil=1∶0.3∶0.5∶150; treatment 9-13, seedling green∶acid regulator∶bed bottom fertilizer∶soil=1∶0.3∶0.5∶200; treatment 14, seedling green∶acid regulator∶bed bottom fertilizer∶soil=1∶0.3∶0.5∶250; among them, treatment 4 and 5 received base fertilizer at 27 g/tray, treatment 12, received diammonium phosphate (1.5 g/tray)+urea (1 g/tray) at 9 and 16 days after tray moving, treatment 13 received ammonium sulfate (3.5 g/tray) at the same intervals, other treatments received urea (2 g/tray) at the same intervals; treatment 9, seeds (9 kg) treated with 60 g mefenoxam·prochloraz, treatment 11 seeds (9 kg) treated with 60 g mefenoxam·prochloraz+0.3 g 15% paclobutrazol, other treatments: seeds (9 kg) treated with 60 g mefenoxam·prochloraz+0.15 g 15% paclobutrazol. The effects of different substrate formulations and fertilization management on seedling growth was investigated. The results showed that treatments 1, 5, 3, 7, 4, 11, 13, 6, and 14 exhibited higher emergence rates, ranging from 57.50% to 68.67%. Plant height across treatments varied between 12.44-20.52 cm, leaf age ranged from 4.86 to 5.53 leaves, white root number measured 11.80-14.37 roots per plant, stem base width spanned 2.00-2.70 mm, and SPAD values fell within 22.07-30.37. Comprehensive analysis of emergence rate, white root number, leaf color, and other parameters identified treatment 11 (seedling green∶acid regulator∶bed bottom fertilizer∶soil=1∶0.3∶0.5∶200; seed treatment, 60 g mefenoxam·prochloraz + 0.3 g 15% paclobutrazol per 9 kg seeds; urea application of 2 g/tray at 9 and 16 days after tray relocation) as optimal. This treatment demonstrated above average performance in emergence rate, white root number, leaf age, and stem base width, proving conducive to cultivating robust seedlings and suitable for production application.