以吉宏6为供试品种，通过设置2种施肥模式（耐冷施肥、高产施肥）和5种插秧密度，筛选最优和次优肥密组合，以指导东北粳稻区水稻覆膜湿润栽培。结果表明，耐冷施肥条件下，由于总施肥量低且施用比例大幅前移，水稻前期生物量、叶面积指数的增速快，成熟期倒伏率低，体现了较好的稳产作用；高产施肥条件下，后期肥料供应充足，单产高，可达705.8 kg/667 m²，体现了较好的丰产作用。综合来看，覆膜湿润栽培条件下的最优和次优肥密组合分别是“高产施肥+插秧密度30 cm×17 cm”和“耐冷施肥+插秧密度30 cm×13 cm”，分别适合在积温充足的东北平原地区和低温冷害频发的东北东部山区应用。

Taking Jihong 6 as the test variety, and setting two fertilization modes (cold-tolerant fertilization, high-yield fertilization) and five transplanting densities, we screened the optimal and sub-optimal fertilizer density combinations to guide the wet cultivation of rice with film mulching in the northeast japonica rice area. The results showed that under the condition of cold-tolerant fertilization, due to the fewer amount of fertilizer and higher proportion of application in early stage, the growth rate of biomass and leaf area index in the early stage was faster, and the lodging rate in the mature stage was lower, reflecting a better effect of stabilizing yield. Under the condition of high-yield fertilization, the fertilizer supply in the later period was more sufficient, and the highest yield could reach 705.8 kg/667 m², which reflected a better high-yield effect. In conclusion, the optimal and sub-optimal combination under the condition of wet cultivation with film mulching were“high-yield fertilization + transplanting density of 30 cm×17 cm” and“cold-tolerant fertilization + transplanting density of 30 cm×13 cm”, respectively, the former suitable to the plain area where accumulated temperature is sufficient, the latter suitable to the eastern mountainous area where low cold damage occur frequently.